Carrier Omnizone 50xj050 User guide

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53500117-01 Printed in U.S.A. Form 50XJ-2T Pg 1 8-14 Replaces: 50XJ-1T

Controls, Start-Up, Operation and

Troubleshooting

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . .1,2

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

MAJOR SYSTEM COMPONENTS . . . . . . . . . . . . . . . 2-6

Controller Processor 6126 (PCB1). . . . . . . . . . . . . . . . 2

I/O Flex Module 8160 (PCB2) . . . . . . . . . . . . . . . . . . . . . 2

Local Interface Display . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Control Module Communication. . . . . . . . . . . . . . . . . . 2

PCB Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Optional and Field-Installed

Accessory Sensors/Devices . . . . . . . . . . . . . . . . . . . 2

Wiring Control Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

CONTROL AND DISPLAY. . . . . . . . . . . . . . . . . . . . . . 7-17

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

BACview Interface Device . . . . . . . . . . . . . . . . . . . . . . . . 9

Log On to BACview Display . . . . . . . . . . . . . . . . . . . . . . 9

Log Out of BACview Display . . . . . . . . . . . . . . . . . . . . . 9

Change Default User Password . . . . . . . . . . . . . . . . . . 9

Automatic Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Set the Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Configure Schedules. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Adjust Set Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Configure Basic Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Unit Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Display/Set Runtime Alarms. . . . . . . . . . . . . . . . . . . . . 13

Display Alarms and Alarm History . . . . . . . . . . . . . . 13

Set Controller Address . . . . . . . . . . . . . . . . . . . . . . . . . . 14

50XJ Variable Frequency Drive (VFD) Control

and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

VFD Control and Display . . . . . . . . . . . . . . . . . . . . . . . . 15

VFD Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17,18

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Confirm the Input Power Phase Sequence . . . . . . . 17

Water Fill and Air Purge . . . . . . . . . . . . . . . . . . . . . . . . . 17

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-20

Occupancy Determination. . . . . . . . . . . . . . . . . . . . . . . 18

Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Sequence of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . 18

Diagnostic Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 20-27

Standard Diagnostic Features,

Alarms and Alarm Lamps . . . . . . . . . . . . . . . . . . . . . 20

50XJ Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . 22

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2

SAFETY CONSIDERATIONS

Installing, starting up, and servicing this equipment can be

hazardous due to system pressures, electrical components, and

equipment location. Only trained, qualified installers and

service mechanics should install, start up, and service this

equipment.

When working on this equipment, observe precautions in

the literature, on tags, stickers, and labels attached to the equip-

ment, and any other safety precautions that apply. Follow all

safety codes. Wear safety glasses and work gloves. Use care in

handling, rigging, and setting this equipment, and in handling

all electrical components.

WARNING

Electrical shock can cause personal injury and death.

Shut off all power to this equipment during installation

and service. There may be more than one disconnect

switch. Tag all disconnect locations to alert others not to

restore power until work is completed.

CAUTION

This unit uses a microprocessor-based electronic control

system. Do not use jumpers or other tools to short out

components, or to bypass or otherwise depart from rec-

ommended procedures. Any short-to-ground of the con-

trol board or accompanying wiring may destroy the

electronic modules or electrical components.

WARNING

DO NOT USE TORCH to remove any component. System

contains oil and refrigerant under pressure.

To remove a component, wear protective gloves and gog-

gles and proceed as follows:

a. Shut off electrical power to unit.

b. Recover refrigerant to relieve all pressure from sys-

tem using both high-pressure and low pressure ports.

c. Traces of vapor should be displaced with nitrogen

and the work area should be well ventilated. Refrig-

erant in contact with an open flame produces toxic

gases.

d. Cut component connection tubing with tubing cutter

and remove component from unit. Use a pan to catch

any oil that may come out of the lines and as a gage

for how much oil to add to the system.

e. Carefully unsweat remaining tubing stubs when nec-

essary. Oil can ignite when exposed to torch flame.

Failure to follow these procedures may result in personal

injury or death.

Omnizone™

50XJ050-104

Water-Cooled Indoor Self-Contained Systems

with Multi-Protocol Controller 6126

GENERAL

This publication contains Controls, Operation and Trouble-

shooting information for the 50XJ units. The Omnizone™

packaged units are self-contained, water-cooled indoor units

for use in VAV (variable air volume) applications. Units are

equipped with Carrier multi-protocol controls. Refer to the unit

Installation Instructions for unit layout.

MAJOR SYSTEM COMPONENTS

Controller Processor 6126 (PCB1) — The cen-

tral processing unit for the Omnizone system control is the UC

Multi-Protocol XP. The controller provides general purpose

HVAC (Heating, Ventilation and Air Conditioning) control and

monitoring capability in a stand-alone or network environment

using closed-loop, direct digital controls. The controller has

been pre-programmed to work in either stand-alone or

BACnet*, MODBUS†, or Johnson N2 network system instal-

lations. The controller will also operate on a LonWorks** net-

work with an accessory LON-OC board installed.

The controller is designed to provide heating and cooling

control, loop control, scheduling, and custom programming.

The main processor provides 24 field points (12 universal in-

puts, 6 relay outputs, and 6 analog outputs). Additional points

are provided by the I/O (input/output) modules. Table 1 lists

the control inputs and outputs for all modules.

Specifications for the Multi-Protocol Controller may be

found in the Open System literature.

I/O Flex Module 8160 (PCB2) — This input/output

module is factory-installed and allows additional factory and

field points (16 inputs and 8 outputs).

The module provides the following inputs: outdoor-air tem-

perature (accessory), leaving-water temperature (accessory),

tower sump temperature (accessory), mixed-air or return-air

temperature (factory), water economizer freeze sensor (option)

or freeze thermostat (accessory), entering water temperature

(option), enthalpy sensor (accessory), filter status switch (op-

tion), phase rotation monitor (option), condenser water flow

switch (option), and compressor status (factory).

This module provides the following field digital outputs:

heat interlock (HIR), VAV terminal control (TRMCT), ventila-

tion request (VENTR), VAV terminal open (TRMOP), pump

request, tower request, and external dehumidification.

Local Interface Display — The BACview interface

display is mounted on the front of the 50XJ units. A number of

user-adjustable features are entered/changed using the display

keypad. These features described in detail in the Control and

Display section of this manual.

Control Module Communication — When power is

applied to the Omnizone™ system control panel, green power

LED (light-emitting diode) lights. Once the control program

initializes, the green RUN LED on each module should flash

on/off about twice a second and the red error (ERR) LED

should be off. The green Tx/Rx LEDS flicker when data is

communicated over the network. The green Tx/Rx LEDS near

the Xnet remote expansion port flicker when the main board

and the expansion board are communicating.

PCB Addresses — Rotary switch 1 (SW1) is used to set

each controller’s address, as well as the input/output module

address. Individual jumpers on each board are used to config-

ure the input point type. For more information, refer to Table 1

and the Optional and Field-Installed Accessory Sensors/Devic-

es section.

Optional and Field-Installed Accessory Sensors/

Devices — These units can be ordered with options and ac-

cessories that add functionality and control. These options and

accessories are used as described below.

NOTE: The control software includes all PCB1 and PCB2

functions, and most of the sensors/devices associated with

those functions are factory installed. However, some sensors/

devices must be field-connected to the proper terminal.

REMOTE OCCUPANCY CONTROL (PCB1) — This con-

trol is a field located switch, controller or timer input which,

when activated, tells system when to switch from unoccupied

to occupied mode.

When in occupied mode, the unit turns on the supply fan

and controls supply fan speed to maintain a duct static set point

measured at the duct static pressure sensor (DSP). The unit

operates to provide conditioning to a set point. When in

unoccupied mode, the unit provides no cooling/heating, or

controls to a ‘setback’ set point.

FIRE ALARM (PCB1) — The fire alarm is a normally

closed, dry contact input that causes the controller to shut the

system down in the event of a fire.

CONDENSER WATER FLOW SWITCH (PCB2) — This

flow switch is located in the unit waterline to ensure that there

is water flow before allowing the unit to start the compres-

sor(s). Compressor operation and economizer cooling is dis-

abled when no flow is detected. These remain disabled until

water flow is again detected.

The factory-installed water flow switch on the 50XJ unit is

a thermal dispersion type switch located inside the unit cabinet.

HEAT INTERLOCK OUTPUT (PCB2) — This output is ac-

tivated whenever heating is activated, commanding the VAV

dampers to operate in heating control mode.

NOTE: In order for this output to function, the terminal

occupied output must also be on.

TERMINAL CONTROL (PCB2) — Terminal control is acti-

vated to command VAV dampers to control to the cooling set

point. Terminal control must be on along with heat interlock for

heating set point control to function.

EXTERNAL RESET INPUT (PCB1) — This modulating

input (0 to 10 vdc) allows remote adjustment (upward) of the

supply air temperature (SAT) sensor set point. The default ex-

ternal reset input setting is 55 F. This variable input can raise

the set point by up to 20 F for a full-range input signal or to any

point in between.

WATER ECONOMIZER COIL (PCB2) — This factory-in-

stalled option contains a water-to-air coil, two (2) electronic

motorized water valves, and related piping. Control of the water

economizer also requires a mixed/return air temperature sensor,

an entering water temperature sensor and an economizer freeze-

stat sensor or switch.

The electronic motorized water valves are each controlled

by the unit controller via separate 2 to 10 vdc variable signals

to define variable valve position.

CAUTION

DO NOT re-use compressor oil or any oil that has been

exposed to the atmosphere. Dispose of oil per local codes

and regulations. DO NOT leave refrigerant system open to

air any longer than the actual time required to service the

equipment. Seal circuits being serviced and charge with

dry nitrogen to prevent oil contamination when timely

repairs cannot be completed. Failure to follow these proce-

dures may result in damage to equipment.

* Sponsored by ASHRAE (American Society of Heating, Refrigerat-

ing and Air-Conditioning Engineers).

† Registered trademark of Schneider Electric.

** Registered trademark of Echelon Corporation. Requires additional

hardware card.

Table 1 — Control Inputs and Outputs

LEGEND

DESCRIPTION ABBREV. TYPE I/O NO. JUMPER SETTINGS

INPUTS

MAIN CONTROLLER (PCB1) Aux. Pwr Out: 24V

Refrigerant Pressure (Cir. no. 1) PRES 0-5V; Internally Powered UI-01 IN01: 0-10V

Duct Static Pressure DSP 4-20mA; Internally Powered UI-02 IN02: 0-20mA

Duct High Static Limit Switch DHS Switch Closure UI-03 IN03: RTD/Dry/Therm

Supply Air Temperature SAT Analog; 10K-2 Sensor UI-04 IN04: RTD/Dry/Therm

unassigned – – UI-05 IN05: RTD/Dry/Therm

Space Zone Sensor (analog) SPT Analog; 10K-2 Sensor UI-06 IN06: RTD/Dry/Therm

Indoor Air Quality IAQ Analog; 0-10V,Ext Powered UI-07 IN07: 0-10V

Indoor Relative Humidity IRH Analog; 0-10V,Ext Powered UI-08 IN08: 0-10V

Building Static Pressure BSP Analog; 0-10V,Ext Powered UI-09 IN09: 0-10V

External Reset RESET Analog; 0-10V,Ext Powered UI-10 IN10: 0-10V

Remote Occupancy RMTOCC Switch Closure UI-11 IN11: RTD/Dry/Therm

Fire Alarm/Shutdown FSD Switch Closure UI-12 IN12: RTD/Dry/Therm

I/O BOARD (PCB2)

Compressor 1 Status CR1 Switch Closure IN-01

Compressor 2 Status CR2 Switch Closure IN-02

Compressor 3 Status CR3 Switch Closure IN-03

Compressor 4 Status CR4 Switch Closure IN-04

Condenser Water Flow Switch CDWF Switch Closure IN-05

Phase/Rotation Monitor PHASE Switch Closure IN-06

Filter Status Switch (Dirty Filter Detect) FLTS Switch Closure IN-07

Differential Enthalpy ENTH Switch Closure IN-08

unassigned – – IN-09 IW9:Therm/Dry

Entering Water Temperature EWT Analog; 5K Sensor IN-10 W8:Therm/Dry

Water Econ Freezestat Sensor or Switch FREEZE Analog; 10K-2 Sensor or Switch Closure IN-11 IW7:Therm/Dry (configurable)

Mixed/Return Air Temperature MA_RA Analog; 10K-2 Sensor IN-12 IW6:Therm/Dry

Tower Sump Temperature TWRTEMP Analog; 10K-2 Sensor IN-13 IW5:Therm/Dry

Leaving Water Temperature LWT Analog; 10K-2 Sensor IN-14 IW4:Therm/Dry

Outdoor Air Temperature OAT Analog; 10K-2 Sensor IN-15 IW2:Therm/Dry

unassigned – – IN-16 IW1:Therm/Dry

BINARY OUTPUTS

MAIN CONTROLLER (PCB1)

Compressor 1 Relay; Form C BO-01

Compressor 1 Relay; Form C BO-02

Compressor 1 Relay; Form C BO-03

Compressor 1 Relay; Form C BO-04

VFD Bypass Start/Stop or CV Fan Start/Stop BPS_S Relay; Form C BO-05

Field Alarm Connection Alarm Relay; Form C BO-06 Field Use

I/O Board (PCB2)

Heat Interlock Relay HIR Relay; Form A (N.O.) BO-01

VAV Terminal Control TRMCT Relay; Form A (N.O.) BO-02

Ventilation Output VENTR Relay; Form A (N.O.) BO-03

VAV Terminal Open TRMOP Relay; Form A (N.O.) BO-04

Water Pump Request PUMP Relay; Form A (N.O.) BO-05

Tower Request TOWER Relay; Form A (N.O.) BO-06

External Humidify/Dehumidify HUMID_OUT Relay; Form A (N.O.) BO-07

unassigned – Relay; Form A (N.O.) BO-08

ANALOG OUTPUTS

MAIN CONTROLLER (PCB1)

VFD Speed Control VFD 0-10V AO-1

Modulating Valve Econ./Head Pressure

Control MVLV 0-10V AO-2

2-Position/Reverse Operation

Valve or Air Economizer ECONO 0-10V AO-3

Heating Output HEAT 0-10V AO-4

Modulating Exhaust Fan EXH 0-10V AO-5

unassigned –0-10V AO-6

AO — Analog Output

BO — Binary Output

CV — Constant Volume

I/O — Input/Output

N.O. — Normally Open

RTD — Resistance Temperature Detector

VAV — Variable Air Volume

VFD — Variable Frequency Drive

The mixed/return air sensor (MA_RA) is an air temperature

sensor located in the unit between economizer coil and

evaporator.

The entering water temperature sensor (EWT) is a probe

type sensor inserted into a copper stub at the unit water inlet

connection.

The 50XJ units can be connected to two types of building

water systems: variable and fixed or constant flow control. In

either case, the economizer water valves are opened whenever

there is a call for cooling and the inlet water temperature is cold-

er than the econimizer lockout set point.

Dependencies — Water economizer option is enabled, fan is

on, and inlet water temperature is below set point; or from “re-

mote scheduler,” or from “remote linkage.”

Economizer mode is switched to off or no start if there is no

condenser water flow, fire input is on, fan is not on, or the unit

is in unoccupied mode.

Variable Waterflow Systems — Whenever water economizer

is off, the economizer flow control valve is fully closed and the

reverse flow valve directly to the condenser is fully open. Upon

engagement of the water economizer, the economizer flow con-

trol valve should be controlled to maintain the mixed air temper-

ature as sensed by the MA-RA sensor, located between the

economizer coil and the DX (direct expansion) cooling coil at a

temperature near the supply air set point. The the reverse flow

valve will be controlled in reverse of the economizer flow con-

trol valve’s position. The following formula is an example: re-

verse/head press ctrl output = 100 – two-position/econo output.

When the unit is off, both valves are closed.

Constant Waterflow Systems — Control of the economizer

flow control valve is same as for variable waterflow systems.

Control of the reverse flow control valve position will inversely

track the economizer flow control valve, such that the total sum

of the two valves open positions always equals 100%. The only

difference between the variable waterflow system and the

constant waterflow system is that for the constant flow system

when the unit is off, the economizer valve will be closed and

the reverse flow control valve will be open.

HEATING COILS AND VALVE (PCB1) — Water or steam

heating options are factory installed. The water or steam con-

trol valve should be installed outside the unit.

HEATING - ELECTRIC HEAT (PCB1) — The controller

provides a 0 to 10 vdc signal to control remote electric heat. A

field-installed step sequencer can be used to convert this signal

in to 2, 4 or more heating stages.

A single controller output is used to drive either a hydronic

heating coil or the electric heat, so without field modifications,

these are mutually exclusive options.

HEAD PRESSURE CONTROL (PCB1) — Head pressure

control is required for unit installations that will experience en-

tering condenser water temperatures of 55 F or lower.

NOTE: Head pressure control is not needed or used in

conjunction with a water economizer. A refrigerant pressure

transducer monitors head pressure on compressor circuit 1,

allowing the unit main controller to regulate water flow rate

in main water line entering the unit (flow to all condensers).

(Water header design to the condensers will be optimized

such as to provide relative flow rates to each condenser

based on its compressor capacity, enabling successful

waterflow control at the main entering pipe.) There are two

possible water valve configurations, as outlined below.

Pressure transducer input is factory installed in the

discharge line of compressor circuit 1. It is provided 5 vdc by

the unit main controller and returns a signal 1 to 5 vdc linearly.

The sensor’s range is 0 to 550 psig.

Water Valve(s) Control

Variable Building Waterflow Systems — Variable waterflow

configurations use only one water valve in the main water

supply pipe. The factory-installed valve is a normally open

motorized variable control type. The valve is controlled by a

2 to 10 vdc signal from the main unit controller using the

reverse/head pressure control output, which modulates to

maintain the head pressure set point.

Constant Building Waterflow Systems — Constant waterflow

configurations use two (2) water valves, only one of which is in

the main water supply pipe. The second valve is located in a

bypass pipe to the main outlet water pipe branched off of the

supply pipe immediately ahead of the first valve. This valve is

same type, but normally closed and is controlled in unison with

the first valve, but opposite position, such that the total opening

of the 2 valves always equals 100%.

VFD BYPASS (PCB1) — The variable frequency drive

(VFD) bypass option provides backup for the VFD in VAV

units. The bypass includes a control switch to select across-the-

line operation or operation through the VFD. When the bypass

is switched to across-the-line operation, the fan will not start

until the user indicates that the VFD access doors are secure via

the BACview keypad. The controller provides an output to sig-

nal the remote VAV dampers to open fully before the fan is

started at full speed. A duct high static (DHS) switch shuts

down the fan if the duct static exceeds the switch setting.

VENTILATION OUTPUT (PCB2) — The ventilation output

is a controller output signal (available for field connection) to a

field-supplied ventilation damper(s). This signal is activated

whenever the unit is in the occupied mode.

SPACE TEMPERATURE SENSOR (PCB2) — A field-sup-

plied Carrier space temperature sensor is required to maintain

space temperature in sensor mode.

SUPPLY AIR RESET — Supply air temperature set point

may be reset using one of several sensors. In the case of multi-

ple sensors and configurations, the precedence of sensor use is

from the top of the list to the bottom:

• EWT (PCB2) — EWT sensor installed, entering water

temperature reset configuration on

• SPT (PCB1) — Space reset configuration on

• MA_RA (PCB2) — Configured for return air sensing

EXHAUST FAN CONTROL OUTPUT (PCB1) — This out-

put is activated whenever the unit is in the occupied mode. This

is a 0 to10 vdc output that controls based on the building pres-

sure input set point.

CONDENSER WATER PUMP REQUEST (PCB2) — This

relay output (provided for field connection) is used to start/stop

the remote condenser water pump. This output is engaged

when the unit is in cooling mode and the supply fan is operat-

ing. This output is also engaged if the economizer freeze pro-

tection is activated.

WATER TOWER REQUEST (PCB2) — This relay output

(provided for field connection) is used to start/stop a remote

water cooling tower. This output is engaged when the unit is in

cooling mode and the supply fan is operating.

PHASE LOSS/REVERSAL PROTECTION SWITCH

(PCB2) — A phase loss/reversal switch may be installed to

detect over/under voltage conditions and phase loss or reversal.

This is a factory-installed option. This switch monitors the unit

power supply leads to detect phase loss or reversal. If the

switch detects improper phasing, an input is sent to the unit

controller, which shuts the unit down. When the switch opens,

the controller outputs are forced off, the alarm output will

close, the red alarm lamp will be lit on the BACview display,

and a system alarm will be generated. Unit reset is automatic

when the voltage and power phases have been restored.

FREEZE THERMOSTAT (FREEZ) (PCB2) — The economiz-

er freezestat, used in conjunction with an optional water

economizer coil or heating coil, is a factory-installed averag-

ing air temperature sensor positioned in the unit inlet airstream.

This may be either a thermistor sensor (automatic reset) or a

switch with capillary tube (manual reset). The unit activates

freeze protection when the sensed air temperature falls below

37 F. In freeze conditions, the supply fan will be stopped, all

compressors will stop, the economizer valve will open to

100%, the pump request output will remain on, and the alarm

lamp will light. This will maintain condenser water flow

through the coil to prevent freezing the coil while stopping all

other operations that could have contributed or will be affected

by the freeze condition. Unit reset is automatic when the con-

tacts on the freeze protection switch close again OR when the

thermistor sensed air temperature exceeds 42 F.

TOWER SUMP TEMPERATURE SENSOR (PCB2) —

This field sensor is used for monitoring (only) the tower sump

temperature.

LEAVING WATER TEMPERATURE SENSOR

(PCB2) — This sensor is used only for monitoring the leaving

water temperature.

BUILDING STATIC PRESSURE SENSOR (PCB1) —

This sensor is used to control the speed of the building exhaust

fan to maintain the building static pressure.

BUILDING EXHAUST FAN SPEED CONTROL

(PCB1) — This output controls building exhaust fan speed.

INDOOR AIR QUALITY (CO2) SENSOR (PCB1) — This

sensor monitors CO2levels and is used to provide demand ven-

tilation override with an air economizer.

OUTDOOR AIR TEMPERATURE SENSOR (PCB2) —

This sensor is used to monitor outdoor-air temperature. When

an air economizer is installed, this is used for changeover and

lockout.

INDOOR RELATIVE HUMIDITY SENSOR (PCB1) —

This sensor monitors the indoor relative humidity and controls

the humidity control relay.

HUMIDITY CONTROL RELAY (PCB2, DEHUMID-

IFY) — This relay controls a humidifier or dehumidification

device.

Wiring Control Devices — Standard controls for the

50XJ unit require no field wiring. Standard 50XJ controls in-

clude: supply-air temperature (SAT), duct static pressure

(DSP), duct high static limit switch (DHS), compressor status

relays (CRx), supply fan control (BPS_S and/or VFD), and

mixed-air/return-air sensor (MA_RA).

NOTE: The MA_RA sensor will be located in the return

airsteam if the unit does not have a water economizer, and in

the mixed airstream if the unit is equipped with a water

economizer.

EXTERNAL 0 TO 10 VOLT DC RESET SIGNAL (RESET,

PCB1) — This field-supplied 0 to 10 vdc signal is used to reset

the supply-air temperature. The controller will scale the signal

to provide 0 reset at 0 volts and 20 degrees of reset at 10 volts.

Wire the positive of the signal to controller terminal block J4,

terminal 16 and the negative to terminal 17.

SUPPLY AIR RESET BY SPACE TEMPERATURE — Use

a 10K-type II thermistor sensor installed at the entering water

temperature sensor location on PCB2 and configure the unit to

control reset by the entering water temperature sensor OR use

the normal space temperature sensor as described below. These

sensors may be connected in a series-parallel network in the

same manner as the space temperature sensor.

SPACE TEMPERATURE SENSOR (PCB1) — The space

temperature sensor (33ZCT55SPT) is used in the following

cases:

• When using the optional water economizer

• To determine the average temperature of the space

served

• To determine supply-air temperature reset, occupied

heating, unoccupied heating and cooling (refer to

Sequence of Operation in Operation section).

To wire the sensor, perform the following (see Fig. 1).

1. Identify which cable is for the sensor wiring.

2. Strip back the jacket from the cable for at least 3 inches.

Strip 1/4-in. of insulation from each conductor. Cut the

shield and drain wire from the sensor end of the cable.

3. Wire the sensor to controller terminal block J4, terminals

9 and 10. A typical 10K thermistor such as the

33ZCT55SPT sensor may be used. If the SPT sensor is

not installed and the MA_RA (mixed air/return air) sen-

sor is configured for return air, the 50XJ unit will use this

sensor to control supply air reset, occupied heat, and un-

occupied heating and cooling. See Fig. 2 for space tem-

perature sensor averaging.

HOT WATER OR STEAM VALVE (HWV, PCB1) — The

controller supplies a 0 to 10 vdc control signal for hot water or

steam valve control or electric heat control in occupied and un-

occupied heat modes. A field-installed step sequencer is re-

quired to convert this signal into 2, 4 or other stages of electric

heat. The positive signal is on terminal block J9, terminal 7,

with the signal common (negative) on terminal 8.

AIR TERMINALS AND FRESH AIR DAMPER

(PCB2) — The VAV terminal open (TRMOP), ventilation out-

put (VENTR), VAV terminal control (TRMCT), and heat inter-

lock relay (HIR) terminals provide dry contacts to command

the VAV terminals open; a ventilation damper open; VAV ter-

minals to control to their cooling set points; and VAV terminals

to control to their heat set points, respectively. These contacts

are located on terminal block J5: TRMOP terminals 7 and 8,

VENTR terminals 5 and 6, TRMCT terminals 3 and 4, and

HIR terminals 1 and 2.

REMOTE OCCUPANCY (PCB1) — The unit may be com-

manded by a remote control system or a twist timer to become

occupied and run when a set of dry contacts close. To enable

remote occupancy control, configure the occupancy point in

BACview to "remote (DI) on/off" and wire the remote contacts

to terminal block J4, terminals 17 and 18.

2345 61

SW1

SEN

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

Fig. 1 — Space Temperature Sensor

Typical Wiring (33ZCT55SPT)

a33-675ef

SMOKE DETECTOR/FIRE ALARM SHUTDOWN (FSD)

(PCB1) — To allow a smoke detector to shut the unit down,

remove the jumper from terminal block J4, terminals 19 and 20

and wire these terminals to a set of normally closed contacts on

the smoke detector.

ALARM (ALARM) OUTPUT (PCB1) — A Form C dry

contact is provided to signal when the controller has an active

alarm. To use these for remote annunciation, connect wiring to

terminal block J10, terminal 18 (normally open), terminal 17

(common), and/or terminal 16 (normally closed).

RED

BLK

RED RED

BLK BLK

BLK

RED

BLK

RED

SENSOR 1 SENSOR 2 SENSOR 3SENSOR 4

RED

BLK

RED

BLK

SENSOR 2

SENSOR 1

RED

BLK

SENSOR 3

SENSOR 4

BLK

RED

RED RED

BLK BLK

SENSOR 8SENSOR 9

SENSOR 5

RED

BLK

SENSOR 6

SENSOR 7

BLK

RED

SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION

SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION

Fig. 2 — Space Temperature Averaging

LEGEND

Field Wiring

a50-8742

a50-8743

CONTROL AND DISPLAY

Controller — The microprocessor-based controller pro-

vides complete system control of unit operation. See Fig. 3 for

typical controller components. The controller monitors all sys-

tem sensors and makes operating decisions based upon the us-

er's configuration inputs. See Fig. 4.

A scheduling function, programmed by the user, controls

the occupied/unoccupied schedule. Up to 4 daily schedules, 12

holiday schedules, and 2 override schedules may be

programmed.

Local access to the microprocessor control may be accom-

plished via the BACview keypad/display unit (BV6H). See

Fig. 3. Recommended application is one BACview display per

jobsite.

The microprocessor control is capable of operating in a

stand-alone control mode and also supports communications

with BACnet, Modbus, and optionally LonWorks building au-

tomation protocols.

In addition, the microprocessor control has the following

features:

• simple access to set points, time schedules, status values,

and unit configuration parameters

• alarm conditions are indicated via an alarm LED (light-

emitting diode) and/or an audible signal

• password protection

• compressor minimum off time (5 minutes) feature

• service diagnostic mode

• field-installed room temperature sensor

• an on/off switch that may be used to cycle the controller

• a battery to maintain time and date in the event of a power

outage (do not remove the battery when power is off)

• DIP switches to configure communication baud rate and

protocol

The IO Flex 6126 controller has 6 binary outputs, 12 uni-

versal inputs and 6 analog outputs. Binary outputs have N/O

(normally open) and N/C (normally closed) contacts used to

turn components on or off. The universal inputs are used to

monitor input from various sensors. These universal inputs can

be set for one of three different sensor input types:

1. Voltage,

2. Temperature (thermistor) or discrete contact, or

3. Current.

There are 2 columns of jumpers to the left of the universal

input plugs, see Fig. 4. The jumpers are used to configure the

input to the desired type (voltage, temperature, etc.). The left

row of jumpers are for the even numbered universal inputs, UI-

12 thru UI-2 (top to bottom). The right column of jumpers are

for the odd numbered universal inputs, UI-11 thru UI-1 (top to

bottom). When the jumper is in the center position (default set-

ting) the universal input is configured for temperature and dis-

crete contact (digital input), such as duct high-limit switch.

When the jumper is in the top position, the input is configured

for a voltage input, for example, a humidity sensor. The bottom

jumper position is used for milliamp input.

The following settings are made at the factory, see Fig. 5:

1. Auxiliary Power Output (Aux Pwr Out) jumper should be

set on 24V to power the 0 to 10 vdc sensors.

2. Analog outputs (AO) labeled AO-1 and AO-2 should be

set on Volts.

3. The module address (MAC) rotary switches are set for

'01' from the factory. The MAC may be reconfigured in

the field if required.

NOTE: To download software to the I/O Flex 6126, the

MAC setting must be on '01'.

Example: If the control module’s address is 01, point the

arrow on the tens (10’s) switch to 0 and the arrow on the

ones (1’s) switch to 1. See Fig. 4.

NOTE: The I/O Flex 6126 recognizes its address only af-

ter power has been cycled.

The communication rate is factory-configured for 38.4 baud

rate.

Aux

Gnd

Aux Pwr Out

+5V

+24V

UI-01

Gnd

UI-02

UI-03

UI-04

UI-05

UI-06

UI-07

UI-08

UI-09

UI-10

UI-11

UI-12

AO-2

AO-3

AO-4

AO-1Gnd

Gnd

Gnd 8

Gnd

AO-5 10

Gnd

AO-6 12

11+

Gnd

Xnet -

Xnet +

Xnet

Remote

Expansion

BO-1

BO-3

BO-2

BO-4

BO-5

BO-6

Flex 6126

Pwr Out

AO Mode Select

10V

20mA

20mA 10V

BACnet®Universal

Mode

RTD

0-10V

0-20mA

Power

Off

24VAC

Gnd

Batt

CR2032

Port 2b*

Gnd

Rnet +

Rnet -

+12V

Rnet

+12V

Rnet

Rnet-

Gnd

Rnet+

Sense

Local

Access

Run

Error

Module

10's

9600

76.8k

19.2k

38.4k

Baud

Full Half

Duplex

BT485

Net + Port 1

Gnd

Net -

CAUTION:

To Reduce The Risk of Fire

Interconnect the Outputs of

Different Class 2 Circuits.

or Electric Shock, Do Not

BO Rating 5A @ 250VAC

Class 2

24VAC, 50-60 Hz

20VA, 0.83A

Use Copper

Conductors Only

232

EIA- EIA-

485

Port 1

Port 2a

Therm

Dry

Unused

Network Switches

(0 = off, 1 = on)

MSTP (m)

MSTP (s)

PTP

SLTA

*PlugIn

*Ethernet

8 7 6 5

Protocol

0000

0001

0010

0011

0100

1101

1110

1111

BACnet

Modbus

LON

Port 2a

2w 4w

Tx+

n/c

Net+

Rx+

Rx-

Tx-Net-

232

DTR

DCD

Signal Ground

Address

1's

Pulse Count Ability

Input

Select

Rate

Format

Made in USA

ARC156

Only

26VDC, 0.17A, 4W

Management Equipment

TYPE: 002108

Open Energy

88FO

E143900

Unused

Even Odd

POWER 24 VAC

BACVIEW6

(RS) ROOM

SENSOR

UNIVERSAL

INPUTS

ANALOG

OUTPUTS

BINARY

OUTPUTS

MENU: <ALARM>UNOCCUPIED

OAT:000.0°.000:TALF0°F

SHUTDOWN:[Off] 100% OA STD PROGRAM”

[ OK ][ CANCEL ][ DECR ][ INCR ]

1 2 34 5 MUTE FN

6 7 89 0 • ENTER

BACview6

Fig. 3 — Typical Controller Components

a62-608

Aux

Gnd

Aux Pwr Out

+5V

+24V

UI-01

Gnd

UI-02

UI-03

UI-04

UI-05

UI-06

UI-07

UI-08

UI-09

UI-10

UI-11

UI-12

AO-2

AO-3

AO-4

AO-1Gnd

Gnd

Gnd 8

Gnd

AO-5 10

Gnd

AO-6 12

11+

Gnd

Xnet -

Xnet +

Xnet

Remote

Expansion

BO-1

BO-3

BO-2

BO-4

BO-5

BO-6

Flex 6126

Pwr Out

AO Mode Select

10V

20mA

20mA 10V

BACnet®Universal

Mode

RTD

0-10V

0-20mA

Power

Off

24VAC

Gnd

Batt

CR2032

Port 2b*

Gnd

Rnet +

Rnet -

+12V

Rnet

+12V

Rnet

Rnet-

Gnd

Rnet+

Sense

Local

Access

Run

Error

Module

10's

9600

76.8k

19.2k

38.4k

Baud

Full Half

Duplex

BT485

Net + Port 1

Gnd

Net -

CAUTION:

To Reduce The Risk of Fire

Interconnect the Outputs of

Different Class 2 Circuits.

or Electric Shock, Do Not

BO Rating 5A @ 250VAC

Class 2

24VAC, 50-60 Hz

20VA, 0.83A

Use Copper

Conductors Only

232

EIA- EIA-

485

Port 1

Port 2a

Therm

Dry

Unused

Network Switches

(0 = off, 1 = on)

MSTP (m)

MSTP (s)

PTP

SLTA

*PlugIn

*Ethernet

8 7 6 5

Protocol

0000

0001

0010

0011

0100

1101

1110

1111

BACnet

Modbus

LON

Port 2a

2w 4w

Tx+

n/c

Net+

Rx+

Rx-

Tx-Net-

232

DTR

DCD

Signal Ground

Address

1's

Pulse Count Ability

Input

Select

Rate

Format

Made in USA

ARC156

Only

26VDC, 0.17A, 4W

Management Equipment

TYPE: 002108

Open Energy

88FO

E143900

Unused

Even Odd

Aux Pwr Out +24V

AO Mode Select - Volts

Power Switch

Battery

10's

1's

1 2 34 5 6 7 8

SET TO 38.4 BAUD

UNUSED

MSTP (m)

Module Address

Options

10’S=0

1’S=1

MODULE

ADDRESS

a62-606

Fig. 4 — Control Module

Factory values:

SWITCHESPOSITION

1=1

2=0

3=0

4=0

5=0

6=0

7=0

8=0

BAUD RATE: 38.4

UNUSED

NETWORK PROTOCOL:

MSTP(m) BACnet

OFF = 0 ON = 1

SET TO 38.4k BAUD

UNUSED

MSTP(m)

1 2 34 5 6 7 8

4 BAUD RATES

8NETWORK

PROTOCOLS

a62-576

Fig. 5 — Control Module Switch Positions

BACview Interface Device — The BACview keypad/

display features a numeric keypad, direction keys, four func-

tion keys, and a backlit LCD (liquid crystal diode) display. See

Fig. 6. For specifications on BACview display see Table 2. The

display is a large 4-line by 40-character display that is easy to

read, even in low light conditions. The keypad/display has a

padded backing and plugs directly into the controller using at-

tached cable. See Fig. 6. To adjust the contrast of the display,

turn the contrast screw on top of the BACview clockwise to

lighten the display or counterclockwise to darken it. See Fig. 6.

The BACview screen goes dim after 10 minutes of inactivi-

ty. Press any key except MUTE or FN to activate the screen.

The user can change the length of inactivity on the KEYPAD

screen.

Table 2 — BACview Specifications

Log On to BACview Display — It is not necessary

to log onto the BACview display to view the unit status, com-

ponent run times, etc. The user must log onto the display to

change any set points or configuration values. If the user at-

tempts to open a screen that requires a login and they have not

already logged onto BACview, the LOGIN screen will appear.

This logon follows the same process described below.

There are two logons for the BACview: Admin and User.

Logging in at the User level allows all set points and schedul-

ing to be changed, but a User cannot change either the User or

Admin passwords or the unit configuration. The Admin logon

allows all the functionality of a User, but adds the ability to

change the User password, ability to change the router data and

BACnet parameters, change the factory configuration, calibrate

sensors, and initiate the unit self-test.

To log on to the BACview, perform the following proce-

dure:

1. If the standby screen is visible, press any key to switch

to the HOME menu.

2. If another screen is displayed, and there is no [LOGIN]

softkey displayed, press the [HOME] softkey to switch to

the HOME menu.

3. Press the [LOGIN] softkey.

4. The following prompt is displayed:

5. Use the numeric keys to enter the User or Admin pass-

word and then press <ENTER> or [OK].

NOTE: The default Admin password is 1111.

6. If an invalid password is entered, the warning "horn" will

chirp. After three failed login attempts the display

switches back the screen where the [LOGIN] softkey was

pressed.

Log Out of BACview Display — The system will

automatically log the User or Admin out of the BACview dis-

play if no display key is pressed for 10 minutes. The inactivity

timer can be adjusted through the "Keypad" screen.

1. If the standby screen is visible, press any key to switch

to the HOME menu.

2. If another screen is displayed, press the [HOME] to

switch to the HOME menu.

3. Press the [LOGOUT] softkey to force the system to log

the user out. The text adjacent to the [LOGOUT] softkey

changes to "LOGIN" when the user is logged out.

Change Default User Password — The user must

log on to the BACview Display as ADMIN to change the user

level password. Alternately, both USER and ADMIN pass-

words may be changed via network tools.

1. If the standby screen is visible, press any key to switch

to the HOME menu.

2. If another screen is displayed, press the [HOME] to

switch to the HOME menu.

3. Press the <right arrow> to scroll down through the

HOME menu options. Move the cursor (brackets) over

[UserPW], then press <ENTER>.

4. The following prompt is displayed:

5. The current user password is shown. Enter the new User

password and then press <ENTER>, OR press [PREV] to

leave the current password intact.

Automatic Self-Test — The controls are programmed

with several automatic run tests that check connection and op-

eration of major components. To perform the run test, verify

that the alarm lamp is off. The red alarm lamp will light during

the run tests and the run tests will cease if other alarms become

active. Once an automatic test is started, the unit will remain in

self-test mode for four minutes after all automatic run tests

complete.

There are separate tests for each section of the unit: variable

volume fan, bypass or constant volume fan, compressor cool-

ing, heating, and water economizer.

To perform a self-test:

Turn unit power on.

1. Log on to the BACview display as ADMIN.

2. From the HOME menu, press the [CONFIG] softkey.

3. From CONFIGURATION menu, press [FACTORY]

softkey.

4. From the FACTORY CONFIGURATION menu, press

the [FACT TEST] softkey.

5. Press the <up arrow> or <down arrow> to select the test

to run, then press <ENTER>.

6. Press the [INCR] softkey to initiate the test, then press

<ENTER>. The test will start 2 seconds later.

The test will automatically end when the test sequence is

complete. To manually halt a test, move the brackets to the test

to stop and press <ENTER>. Press the [INCR] softkey to select

Off, then press <ENTER>.

FEATURE SPECIFICATION

Power Supplied by the Rnet port througt the cable

(+12 vdc at 250 mA)

Display

4-line by 40-character backlit LCD display,

alarm LED and audible horn for alarm

conditions

Protection 15 KV ESD protection to the enclosure.

Physical Rugged aluminum enclosure for protection

Environmental

Operating Range

32-120 F (0-48.9 C)

10-90% RH non-condensing

Overall

Dimensions

Width: 9 5/8 in. (24.5 cm)

Height: 4 15/16 in. (12.5 cm)

Weight 1.5 lb (0.68 kg)

Listings UL-916 (PAZX), CE (1997), FCC Part 15-Sub-

part B-Class A

Admin or User

Password: [ ]

View/Set User

Password: [ ]

GENERAL TEST INFORMATION — The self-test routine

requires the user to login with Admin access.

The self-test routines will NOT operate if there is an active

alarm. If the user attempts to start a test with an alarm, the point

will automatically switch from On to Off.

During the testing, the BACview alarm lamp will be on and

the fans, compressors, and heating should halt operation, ex-

cept during the applicable tests.

The self-test routines will halt if there is an active alarm.

The self-test routines will lock the unit into test mode for 4

minutes after the last test has completed.

At test start-up and at each test step, the alarm output relay

will turn on for 2 seconds. The relay status is indicated by a red

LED adjacent to the output.

VARIABLE VOLUME FAN TEST SEQUENCE (VAV

UNITS ONLY) — The VAV fan test cannot be conducted

while running the compressor start/stop test.

1. As the alarm relay closes, the supply fan should start

and ramp up to 20% speed.

2. Thirty seconds after the test starts, the supply fan should

ramp up to 35% speed.

3. After 60 seconds the test point should be off and the fan

should stop.

CONSTANT VOLUME FAN TEST SEQUENCE (Non-

VAV Units Only) — The airflow type (base configuration

screen) should be set to constant. This test cannot be conducted

while running the compressor start/stop test. This is the same

test point used to test the VFD bypass.

Since constant volume units do not have remote VAV termi-

nals, there is no built-in delay to allow remote boxes to open

before starting the fan.

1. As the alarm relay closes, the supply fan should start at

full speed.

2. After 5 seconds the test point should be off and the fan

should stop.

VFD BYPASS TEST (VAV Units Only) — The airflow type

(base configuration screen) should be set to variable. This test

cannot be conducted while running the compressor start/stop

test test.

The VFD bypass control switch must be set to line (bypass)

mode.

The access panel secure (Access Panel SC) on the CNTL

CONFIG screen must be set to yes to allow this test to operate.

1. As the alarm relay closes, the TRMOP output engages

to signal the remote boxes to open.

2. Thirty econds after the test starts, the supply fan should

start at full speed.

3. After 60 seconds the test point should be off and the fan

should stop.

COMPRESSOR START/STOP TEST — This test operates

each compressor, individually, for 5 seconds. If a compressor

fault is detected for two continuous seconds, this test should

terminate.

Rnet

Local

Access

MENU: <ALARM>UNOCCUPIED

OAT:000.0°F LAT:000.0 °F

SHUTDOWN:[Off] 100% OA STD PROGRAM”

[ OK ][ CANCEL ][ DECR ][ INCR ]

BACview6

CONTRAST

SCREW

HOTKEYS ARROW KEYS

SELECTED

CHARACTER IS

UNDERLINED

SOFTKEY LABEL

SOFTKEY

HIGHLIGHTED

FIELD IN

BRACKETS

1 2 34 5 MUTE FN

6 7 89 0 • ENTER

Fig. 6 — BACview Connection to Unit Controller

a62-573

This test will operate the number of compressors indicated

on the "# of Comps" section of the BASE CONFIG screen.

1. As the alarm relay closes, Compressor 1 starts and

operates for 5 seconds.

2. One second after compressor 1 stops, compressor 2 starts

and operates for 5 seconds.

3. One second after compressor 2 stops, compressor 3 (if

configured) starts and operates for 5 seconds.

4. One second after compressor 3 stops, compressor 4 (if

configured) starts and operates for 5 seconds.

5. After the last configured compressor stops, the test point

returns to off.

HEATING — This test operates the analog output used to con-

trol a field-installed heating valve. The timing is set to allow

the use of a DC voltmeter to check the controller output.

This test will NOT test electric heat. If the heat type indicat-

ed on the "Heat Config" section of the BASE CONFIG screen

is set to "electric" this test will not run.

1. As the alarm relay closes, the heating output will be

0 vdc.

2. Ten seconds later the heating output moves to 5 vdc.

3. Ten seconds later the heating output moves to 10 vdc.

4. Ten seconds later the test point returns to Off and the heat

output returns to normal control.

WATER ECONOMIZER (H2O ECON) — This test checks

operation of the modulating valve (MVLV) and economizer

valve (ECONO).

1. As the alarm relay closes, the output to both valves is

0 vdc. Both valves should close.

2. Two minutes later, economizer valve opens (10 vdc) and

modulating valve remains closed (0 vdc).

3. Two minutes later, economizer valve closes (0 vdc) and

modulating valve opens (10 vdc)

4. Two minutes later the test point returns to off and the

valves return to normal control.

Set the Clock — The user must be logged on as either a

User or Admin to set the clock. To set the clock, perform the

following procedure:

1. From the HOME menu, press the arrow keys until the

cursor brackets are around ClockSet, then press

<ENTER>.

2. Use the arrow keys to scroll around the screen and select

the data fields to change.

3. To change a field, move the cursor (brackets) to the de-

sired field then press enter.

4. If the wrong field is entered or you do not want to change

a value, press [CANCEL] to leave the current setting in-

tact.

5. To setup Daylight Savings time and Standard time, move

the cursor (brackets) over DST and then press <EN-

TER>. You can then scroll through and set the time of

day to start daylight savings mode (default is 02:00), the

amount of time to offset (default is 60 minutes), begin-

ning (B) and ending (D) dates.

Configure Schedules — Local schedules are one

method of starting and stopping the unit at specified intervals.

There are four normal schedules that provide day to day opera-

tion. There are twelve holiday schedules that are used to over-

ride the normal schedule and set the unit to unoccupied mode.

There are two override schedules that are used to override the

normal and holiday schedules to force the unit into occupied

mode.

The user must be logged on as User or Admin to configure

the schedules using following procedure.

NORMAL (LOCAL) SCHEDULES

1. From the HOME menu, select the the [CONFIG] soft-

key to enter the CONFIGURATION menu.

2. Use the arrow keys to select OCCUPANCY, then press

<ENTER>.

3. Press the [LOCAL] softkey to adjust the normal sched-

ules.

4. Use arrow keys to scroll around the screen and select the

data field to change. These buttons scroll through the data

fields, as well as up and down the screen.

5. To change a field, move the cursor brackets to the desired

field then press <ENTER>.

6. If the wrong field is entered or you do not want to change

a value, press [CANCEL] to leave the current setting in-

tact.

7. Press the [PREV] softkey to move the previous screen or

schedule. Press the [NEXT] softkey to move to the next

schedule screen.

If viewed as a single large screen, the layout is dis-

played as follows:

The time settings are in 24-hour time. The Start Time line is

used to set the occupied start time. The End Time line is used to

set the unoccupied start time. The “Apply Times Above to”

section is used to set whether the schedule is active each day of

the week. Select Yes to activate the schedule on a given day of

the week and No to ignore the schedule on that day. The NEXT

item at the bottom of screen moves you to the next normal

schedule set point.

Setting the start time and end time to 0 hours and 0 minutes

disables a schedule.

HOLIDAY SCHEDULES

1. From the HOME menu, select the [CONFIG] softkey

to enter the CONFIGURATION menu.

2. Use the arrow keys to select OCCUPANCY, then press

<ENTER>.

3. Press the [HOLIDAY] softkey to adjust the holiday

schedules.

4. Use arrow keys to scroll around the screen and select the

data field to change. These buttons scroll through the data

fields, as well as up and down the screen.

5. To change a field, move the cursor brackets to the desired

field then press <ENTER>.

6. If the wrong field is entered or you do not want to change

a value, press [CANCEL] to leave the current setting in-

tact.

7. Press the [PREV] softkey to move the previous screen or

schedule. Press the [NEXT] softkey to move to the next

schedule screen.

--------------------- Schedule #1 ---------------------

Start Time [hh:mm] 0: 0

End Time [hh:mm] 0: 0

Apply Times Above to

nTue Wed Thu Fri Sat Sun

No No No No No No No

[->PREV] [->NEXT] [->HOME]

If viewed as a single large screen, the layout is as follows:

The Month and Day entries select the month (1 to 12) and

day (1 to 31) of the holiday. The time settings are in 24-hour

time, with Start Time used to set the time of day to start of the

holiday. The End Time line is used to set the end of the holiday.

The NEXT item at the bottom of screen moves you to the next

holiday schedule set point.

Setting the month or day or start time and end time to 0 dis-

ables the holiday schedule.

The holiday schedule cancels any normal schedule set for

the holiday date and time. If a normal schedule is set from 0700

to 1800 hours and a holiday schedule is set for the same day

from 0800 to 1700, the unit will be unoccupied from midnight

to 0700. The unit will change to occupied mode at 0700 until

0800. At 0800 the holiday schedule forces the unit to

unoccupied mode until 1700. At 1700, control returns to the

normal schedule and the unit goes occupied from 1700 to

1800. At 1800, the unit returns to unoccupied mode per the

normal schedule.

OVERRIDE SCHEDULES

1. From the HOME menu, select the [CONFIG] softkey

to enter the CONFIGURATION menu.

2. Use the arrow keys to select OCCUPANCY, then press

<ENTER>.

3. Press the [OVERRIDE] softkey to adjust the override

schedules.

4. Use arrow keys to scroll around the screen and select the

data field to change. These buttons scroll through the data

fields, as well as up and down the screen.

5. To change a field, move the cursor brackets to the desired

field then press <ENTER>.

6. If the wrong field is entered or you do not want to change

a value, press [CANCEL] to leave the current setting in-

tact.

7. Press the [PREV] softkey to move the previous screen or

schedule. Press the [NEXT] softkey to move to the next

schedule screen.

If viewed as a single large screen, the layout is as follows:

The Month and Day entries select the month (1 to 12) and

day (1 to 31) of the override. The time settings are in 24-hour

time, with Start Time used to set the time of day to start of the

override. The End Time line is used to set the end of the over-

ride. The NEXT item at the bottom of screen moves you to the

next override schedule set point.

Setting the month or day or start time and end time to 0 dis-

ables the override schedule.

The override schedule has the highest priority of any sched-

ule. When an override schedule is active, it overrides any nor-

mal or holiday schedule and forces the unit to occupied mode.

In the example listed under the holiday schedule, assume an

override schedule is set for 1300 to 1400 of that day. The unit

operation remains the same, except the unit will switch to oc-

cupied mode from 1300 to 1400.

Adjust Set Points — The user must be logged on as

User or Admin to configure set points.

1. From the HOME menu, select the [CONFIG] softkey

to enter the CONFIGURATION menu.

2. Use the arrow keys to select SETPOINT, then press

<ENTER>.

3. Use arrow keys to scroll around the screen and select the

data field to change. These buttons scroll through the data

fields, as well as up and down the screen.

4. To change a field, move the cursor brackets to the desired

field then press <ENTER>.

5. If the wrong field is entered or you do not want to change

a value, press [CANCEL] to leave the current setting

intact.

See Table 3 for a description of the items on the SETPOINT

menu.

Table 3 — Setpoint Menu

LEGEND

--------------------- Holiday Schedule #1 ---------------------

Mont

h:0

Day : 0

Start Time [hh:mm] 0: 0

End Time [hh:mm] 0: 0

[->PREV] [->NEXT] [->HOME]

--------------------- Override Schedule #1 ---------------------

Mont

h:0

Day : 0

Start Time [hh:mm] 0: 0

End Time [hh:mm] 0: 0

[->PREV] [->NEXT] [->HOME]

SET POINT DEFAULT RANGE

Duct Static Pressure (VAV Setpoint) 1.5 in. wg 0.05 to 3 in. wg

Supply Fan Proof Level (Fan On) 0.4 in. wg 0 to 0.5 in. wg

Occupied Cooling (Space) 74 F (Occupied Heating +1) to

100 F

Occupied Heating (Space) 70 F 0 to (Occupied Cooling -

1) F

Unoccupied Cooling (Space) 85 F (Unoccupied Heating +1)

to 100 F

Unoccupied Heating (Space) 55 F 0 to (Unoccupied Cool-

ing -1) F

Supply Air Cooling 55 F 50 to 70 F

Supply Air Heating 120 F (Cooling Set point + 10)

to 140 F

Supply Air Reset Ratio 3.0 F 1 to 10 F

Maximum Supply Air Reset 20 F 0 to 20 F

Refrig. Head Pressure 225 psig 200 to 300 psig

Economizer Lockout (Air Econ) 68 F 50 to 85 F

Air Econ Minimum Position 20% 0 to 100%

Indoor Air Quality 850 ppm 0 to 2000 ppm

Occupied Humidify 0% rh 0 to Occupied Dehumid-

ify % rh

Occupied Dehumidify 100% rh Occupied Humidify to

100% rh

Unoccupied Humidify 0% rh 0 to Unoccupied Dehu-

midify% rh

Unoccupied Dehumidify 100% rh Unoccupied Humidify to

100% rh

Space Static Pressure 0.02 in. wg 0 to 0.3 in. wg

Space Static Sensor-Low -0.5 in. wg -1 to -0.2 in. wg

Space Static Sensor-RNG (range) 1 in. wg 0 to 2 in. wg

H2O Econ Flush Duration 12 min 3 to 20 minutes

H2O Econ Flush Interval 12 hrs 12 to 168 hours

T55 Time Override Hours 1 hour 0 to 24 hours

ppm — Parts Per Million

rh — Relative Humidity

VAV — Variable Air Volume

Configure Basic Unit — The user must be logged on

as Admin to adjust these control configurations.

1. From the HOME menu, select the press the [CONFIG]

softkey to enter the CONFIGURATION menu.

2. From the CONFIGURATION menu, press the [FACTO-

RY] softkey to enter the FACTORY CONFIGURATION

menu.

3. Use arrow keys to scroll around the screen and select the

data field to change. These buttons scroll through the data

fields, as well as up and down the screen.

4. To change a field, move the cursor brackets to the desired

field then press <ENTER>.

5. If the wrong field is entered or you do not want to change

a value, press [CANCEL] to leave the current setting in-

tact.

See Table 4 for a description of the items on the FACTORY

CONFIGURATION menu.

Table 4 — Factory Configuration Menu

*These points are factory set to the appropriate value if affected by a factory-

installed option.

Unit Configuration — The user must be logged on as

Admin or User to adjust these configuration points.

1. From the HOME menu, select the press the [CONFIG]

softkey to enter the CONFIGURATION menu.

2. From the CONFIGURATION menu, press the [UNIT]

softkey to enter the second CONFIGURATION menu.

3. Use arrow keys to scroll around the screen and select the

data field to change. These buttons scroll through the data

fields, as well as up and down the screen.

4. To change a field, move the cursor brackets to the desired

field then press <ENTER>.

5. If the wrong field is entered, do not change a value, press

[CANCEL] to leave the current setting intact.

See Table 5 for a description of the items on the CONFIGU-

RATION menu.

Table 5 — Configuration Menu

*These points are factory set to the appropriate value if affected by a factory-

installed option.

Unit Status — The system status can be monitored with-

out logging onto the BACview display by pressing the [Status]

softkey on the HOME menu and using the arrow keys to navi-

gate the screen.

See Table 6 for a description of the items on the on the

UNIT STATUS menu.

Display / Set Runtime Alarms — It is not necessary

to log onto the BACview display to view the compressor and

fan run time values. It is necessary to log onto BACview to set

runtime limits or clear the accumulated run times.

To view run times, press the [CONFIG] softkey on the

HOME menu, then select the RUNTIME option from the

CONFIGURATION menu. Use the arrow keys to scroll

through the display.

To change runtime alarm values move to the column

marked "Alarm" and press <ENTER> then use the numeric

keys to enter the alarm value and again press <ENTER>. To re-

set the accumulated run time, move to the column marked

"Clear", press <ENTER>, then the [INCR] softkey to select

"Yes", then press <ENTER>. The display will prompt for the

user or admin passwords if the operator is not already logged

on to the display.

Display Alarms and Alarm History — It is not

necessary to log onto the BACview to display the Current

Alarms or the Alarm History. To view the Alarm information,

press the [ALARM] softkey on the HOME menu.

POINT NAME DEFAULT OPTIONS

Occupancy Input Selection Remote DI

Always Occupied

Local Schedule

BACnet Schedule

BAS On/Off

Remote DI

Airflow Type Variable* Constant or Variable

Number of Compressors 4* 2, 3, or 4

Heat Type None* None, Hydronic, Electric

Econ Water Flow Type Constant* Constant or Variable

Mixed/Return Sensor Type None* None, Mixed or Return

Water Econ Freeze Sensor

Ty p e None* None, Thermistor, or Switch

Entering Water Temp Sensor None* None or Installed

(Condenser) Water Flow

Switch None* None or Installed

Modulating Water Valve None* None or Installed

Head Pressure Control None* None or Enabled

POINT NAME DEFAULT OPTIONS

Occupancy Input Selection Remote DI

Always Occupied

Local Schedule

BACnet Schedule

BAS On/Off

Remote DI

VFD Access Panel Secure No No or Yes

Heat Type None*

None

Hydronic

Electric

Occupied Heating Allowed Yes No or Yes

Allow Unoccupied Free Cooling No No or Yes

Allow Mechanical Dehumidification No No or Yes

Supply Air Reset by EWT (Entering

Water Temperature) No No or Yes

Supply Air Reset by SPT (Space

Temperature) No No or Yes

Water Econ Flush Type Timed Timed or Daily

Air-Side Economizer Installed None None or Installed

Outdoor Air Temp Sensor None None or Installed

Indoor Air Quality Sensor None None or Installed

Indoor Relative Humidity None None or Installed

Air-Econ Enthalpy Control No No or Yes

Space Static Pressure Control No No or Yes

Technician - Area Code 000 3-digit number

Technician - Prefix 000 3-digit number

Technician - Extension 0000 4-digit number

Table 6 — Unit Status Menu

Set Controller Address — The UC Open XP control-

ler’s rotary switches determine the UC open XP’s MAC ad-

dress when it is placed on a BACnet MS/TP network. The rota-

ry switches define the MAC address portion of the device’s

BACnet address, which is composed of the network address

and MAC address.

Perform the following procedure to assign an address:

1. Turn off the UPC Open XP power switch.

2. Using the rotary switches, set the controller address. Set

the Tens (10’s) switch to the tens digit of the address, and

set the Ones (1’s) switch to the ones digit. For example, if

the controller address is 25, point the arrow on the 10’s

switch to 2 and the aroow on the 1’s switch to 5. See Fig.

3. Turn on the UPC Open XP power switch. The controller

reads the address each time power is applied.

50XJ Variable Frequency Drive (VFD) Control

and Start-Up — The VFD is factory-wired and pro-

grammed for proper operation with the unit controls. No instal-

lation or service adjustments are normally required. There is a

keypad/display mounted on the front of the VFD which is inde-

pendent of the main 50XJ control display.

For basic information on using the VFD keypad/display re-

fer to the VFD Control and Display section.

VFD START-UP PROCEDURE — The following procedure

is used to start up the VFD.

1. Switch the 50XJ PCB1 power switch to OFF.

2. Apply VFD unit power. From the VFD keypad, perform

the following steps.

3. Press [EXIT] at the "Auto Choice - Is this an air-handler

or rooftop?" prompt.

4. Press [MENU] until the "Main Menu" is displayed.

5. Use the UP/DOWN keys to select "ASSISTANTS" and

press <ENTER>.

6. Use the UP/DOWN keys to select "Commission Drive"

and press [SEL].

7. Verify the following parameters. If they are correct, press

<SAVE> to move to the next parameter. Use the UP/

DOWN keys to change parameters, then press <SAVE>.

If you make a mistake in the data entry, press <EXIT>

and re-start the procedure at Step 6.

9905 Motor Nom Volt - should equal unit voltage

(230V or 460V)

9906 Motor Nom Current - equal to motor FLA (see

motor nameplate).

9907 Motor Nom Freq - always 60 Hz.

9908 Motor Nom Speed - set to motor nameplate

RPM.

9909 Motor Nom Power - set to motor nameplate HP.

9902 HVAC Default - press <EXIT>

8. Press <EXIT>, <EXIT>.

9. Press [MENU] until the "Main Menu" is displayed.

10. Use the UP/DOWN keys to select "PARAMETERS" and

press <ENTER>.

STATUS POINT INDICATORS

Operating Mode

OFF

Fan Only

Economizer

DX Cooling

Heating

Te s t

Shutdown

Alarm Output Off or On

Occupancy Status Occupied or Unoccupied

Occupancy Control

Always Occupied

Local Schedule

BACnet Schedule

BAS On/Off

Remote DI

Fire/Shutdown Input Ok or Alarm

Power Monitor Ok or Alarm

Fan Off or On

Fan Output <value> %

VFD Bypass Off or On

Duct Static Pressure <value> in. wg

Duct Hi-Limit Switch Ok or Alarm

Filter Status Switch Ok or Alarm

Supply Air Temperature <value> F

Cooling SAT Setpoint <value> F

Heating SAT Setpoint <value> F

External Cooling Reset <value> vdc

Space Temperature <value> F

Rnet Sensor Inactive or Connected

Compressor 1 Status Off or On

Compressor 2 Status Off or On

Compressor 3 Status Off or On

Compressor 4 Status Off or On

Heating Capacity <value> %

Condenser Water flow Flow or No Flow

Refrigerant Pressure <value> PSIG

Modulating Valve <value> %

Water Economizer Valve <value> %

Outdoor Air Damper <value> %

VAV Terminal Open Off or On

VAV Terminal Operate Off or On

Heat Interlock Relay Off or On

Ventilation Request Off or On

Water Pump Request Off or On

Tower Request Off or On

Entering Water Temp <value> F

Mixed/Return Air Temp <value> F

Economizer Input <value> F

Freeze Stat Input Ok or Alarm

Outdoor Air Temperature <value> F

Enthalpy Input Ok or High

Indoor Air Quality Level <value> ppm

Indoor Relative Humidity <value> %

Humidity Output Off or On

Space Static Pressure <value> inches w.c.

Exhaust Fan Output <value> %

Leaving Water Temperature <value> F

Tower Sump Temperature <value> F

10's

1's

Fig. 7 — Address Rotary Switches

a48-8578

11. Use the UP/DOWN keys to select "20 Limits" and press

[SEL].

12. Use the UP/DOWN keys to select "2003 Max Current"

and press [EDIT].

13. Set equal to the motor nameplate FLA * Service Factor;

press [SAVE]. If not possible, set the drive to the motor

FLA. If that is not possible, STOP immediately and call

engineering support.

14. Press [EXIT] repeatedly until the drive returns to "PA-

RAMETER" screen.

15. Use the UP/DOWN keys to select "26 Motor Control"

and press [SEL].

16. Use the UP/DOWN keys to select "2606 Switching Freq"

and press [EDIT].

17. Use the UP/DOWN keys to select "8 kHz" and press

[SAVE].

18. Press [EXIT] repeatedly until the drive returns to "PA-

RAMETER" screen.

19. Use the UP/DOWN keys to select "16 System Controls"

and press [SEL].

20. Use the UP/DOWN keys to select "1601 - Run Enable"

and press [EDIT].

21. Use the UP/DOWN keys to select "NOT SEL" and press

[SAVE].

22. Use UP/DOWN keys to select "1608 - Start Enable 1"

and press [EDIT].

23. Use UP/DOWN keys to select "NOT SEL" and press

[SAVE].

24. Press [EXIT] repeatedly until the drive returns to the

monitor screen and displays Hz, Amps, etc.

25. Switch 50XJ PCB1 power switch to ON.

VFD Control and Display — The VFD keypad/dis-

play is shown in Fig. 8.

OPERATING THE DRIVE — The first time the drive is

powered up, it is in the AUTO mode (remote control), and

controlled from the control terminal block X1. To switch to

the HAND mode (local control) and control the drive using

the control panel (operator keypad), press the HAND key or

or the OFF key. Pressing the HAND key switches the drive

to local control while keeping the drive running. Pressing

the OFF key switches to local control and stops the drive.

To switch back to the AUTO mode, press the AUTO key.

The function of SOFT KEYS 1 and 2 change depending

on what is displayed on the screen. The function of SOFT

KEY 1 matches the word in the lower left-hand box on the

display screen. The function of SOFT KEY 2 matches the

word in the lower right-hand box on the display screen. If

the box is empty, then the SOFT KEY does not have a func-

tion on that specific screen. The UP and DOWN keys are

used to navigate through the menus. The OFF key is used to

turn off the VFD. The AUTO key is used to change control

of the drive to automatic control. The HAND key is used to

change control of the drive to local (hand held) control. The

HELP button is used to access the help screens.

START-UP WITH ASSISTANT — To start up the VFD

with the Start-Up Assistant, perform the following proce-

dure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight ASSISTANTS

on the display screen and press ENTER (SOFT KEY 2).

3. Use the UP or DOWN keys to highlight Commission

Drive and press SEL (SOFT KEY 2).

4. The Start-Up Assistant will display the parameters that

need to be configured. Select the desired values and press

SAVE (SOFT KEY 2) after every change. The process

will continue until all the parameters are set.

START-UP BY CHANGING PARAMETERS INDIVIDU-

ALLY — To start up the VFD with by changing individual

parameters, perform the following procedure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight PARAMETERS

on the display screen and press ENTER (SOFT KEY 2).

3. Use the UP and DOWN keys to highlight the desired pa-

rameter group and press SEL (SOFT KEY 2).

4. Use the UP or DOWN keys to highlight the desired pa-

rameter and press EDIT (SOFT KEY 2).

5. Use the UP or DOWN keys to change the value of the

parameter.

6. Press SAVE (SOFT KEY 2) to store the modified value.

Press CANCEL (SOFT KEY 1) to keep the previous val-

ue. Any modifications that are not saved will not be

changed.

7. Choose another parameter or press EXIT (SOFT KEY 1)

to return to the listing of parameter groups. Continue until

all the parameters have been configured and then press

EXIT (SOFT KEY 1) to return to the main menu.

NOTE: The current parameter value appears above the

highlighted parameter. To view the default parameter value,

press the UP and DOWN keys simultaneously. To restore

the default factory settings, select the application macro

“HVAC Default.”

VFD Modes — The VFD has several different modes

for configuring, operating, and diagnosing the VFD. The

modes are:

• Standard Display mode — shows drive status informa-

tion and operates the drive

• Parameters mode — edits parameter values individually

• Start-Up Assistant mode — guides the start up and

configuration

• Changed Parameters mode — shows all changed

parameters

• Drive Parameter Backup mode — stores or uploads the

parameters

• clock set mode — sets the time and date for the drive

• I/O Settings mode — checks and edits the I/O settings

Standard Display Mode — Use the Standard Display mode

to read information on the drive status and operate the drive.

To reach the standard display mode, press EXIT until the

LCD display shows status information as described below.

See Fig. 9.

Fig. 8 — VFD Keypad/Display

a39-2918

The top line of the LCD display shows the basic status

information of the drive. The HAND icon indicates that the

drive control is local from the control panel. The AUTO

icon indicates that the drive control is in remote control

mode through the I/O.

The arrow icon indicates the drive and motor rotation

status. A rotating arrow (clockwise or counterclockwise) in-

dicates that the drive is running. A rotating blinking arrow

indicates that the drive is running but not at set point.

A stationary arrow indicates that the drive is stopped. For

Carrier air handler units, the rotation is always forward.

Using parameter group 34, the middle of the LCD dis-

play can be configured to display 3 parameter values. The

default display shows parameters 0103 (OUTPUT FREQ)

in Hz, 0104 (CURRENT) in amperes, and AI1 (Analog In-

put 1) in revolutions per minute.

The upper right hand corner shows the frequency set

point that the drive will maintain. The bottom corners of the

LCD display show the functions currently assigned to the

two soft keys. The lower middle displays the current time (if

configured to show the time).

The first time the drive is powered up, it is in the OFF

mode. To switch to local hand-held control and control the

drive using the control panel, press the HAND or AUTO

buttons. Pressing the HAND button switches the drive to

hand control while keeping the drive running. Pressing the

AUTO button switches the drive to remote input control.

The OFF button stops the drive. To return to auto control,

press the AUTO button. To start the drive press the HAND

or AUTO button, to stop the drive press the OFF button.

To adjust the speed set point while in HAND mode, press

the UP or DOWN buttons (the reference changes immedi-

ately). The reference can be modified in the local control

(HAND) mode, and can be parameterized (using Group 11

reference select) to also allow modification in the remote

control mode.

Parameters Mode — The Parameters mode is used to

change the parameters on the drive. To change parameters,

perform the following procedure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight PARAMETERS

on the display screen and press ENTER (SOFT KEY 2).

3. Use the UP or DOWN keys to highlight the desired pa-

rameter group and press SEL (SOFT KEY 2).

4. Use the UP or DOWN keys to highlight the desired pa-

rameters and press EDIT (SOFT KEY 2).

5. Use the UP or DOWN keys to change the value of the

parameters.

6. Press SAVE (SOFT KEY 2) to store the modified value.

Press CANCEL (SOFT KEY 1) to keep the previous val-

ue. Any modifications that are not saved will not be

changed.

7. Choose another parameter or press EXIT (SOFT KEY 1)

to return to the listing of parameter groups. Continue until

all parameters have been configured and then press EXIT

(SOFT KEY 1) to return to main menu.

NOTE: The current parameter value appears above the

highlight parameter. To view the default parameter value,

press the UP and DOWN keys simultaneously. To restore

the default factory settings if a drive fails, download the

parameters to the VFD from the control panel. Parameters

can also be changed individually.

Changed Parameters Mode — The Changed Parameters

mode is used to view and edit recently changed parameters

on the drive. To view the changed parameters, perform the

following procedure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight CHANGED

PAR on the display screen and press ENTER (SOFT

KEY 2). A list of the recently changed parameters will be

displayed.

3. Use the UP or DOWN keys to highlight the desired pa-

rameter group and press EDIT (SOFT KEY 2) to change

the parameters if desired.

4. Press EXIT (SOFT KEY1) to exit the Changed Parame-

ters mode.

Drive Parameter Backup Mode — The Drive Parameter

Backup mode is used to store the drive parameters. The pa-

rameters can be uploaded from a VFD to the removable

control panel. If a drive failure occurs, the control panel can

then be transferred to the new drive and the parameters

downloaded into memory.

Each drive is custom programmed at the factory. The

first option is to download all parameters. This copies both

application and motor parameters to the drive from the con-

trol panel. This is recommended to create a backup of the

parameters group for the drive.

The second option downloads only the application pa-

rameters to the drive. Parameters 9905, 9906, 9907, 9908,

9909, 1605, 1607, 5201, and group 51 parameters and inter-

nal motor parameters are not copied.

Upload All Parameters — To upload and store all parame-

ters to the control panel from the VFD, perform the follow-

ing procedure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight PAR BACKUP

on the display screen and press ENTER (SOFT KEY 2).

3. Use the UP or DOWN keys to highlight UPLOAD TO

PANEL and press SEL (SOFT KEY 2).

4. The text “Copying Parameters” will be displayed with a

progress indicator. To stop the process, select ABORT

(SOFT KEY 1).

5. When the upload is complete, the text “Parameter upload

successful” will be displayed.

6. The display will then return to the PAR BACKUP menu.

Select EXIT (SOFT KEY 1) to return to the main menu.

7. The control panel can now be disconnected from the

drive.

Download All Parameters — To download all parameters

from the control panel to the VFD, perform the following

procedure:

1. Install the control panel with the correct parameters onto

the replacement VFD.

2. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

3. Use the UP or DOWN keys to highlight PAR BACKUP

on the display screen and press ENTER (SOFT KEY 2).

4. Use the UP or DOWN keys to highlight DOWNLOAD

TO DRIVE ALL and press SEL (SOFT KEY 2).

MODE SET POINT

Fig. 9 — Standard Display Example

a39-2919

5. The text “Restoring Parameters” will be displayed with a

progress indicator. To stop the process, select ABORT

(SOFT KEY 1).

6. When the download is complete, the text “Parameter

download successful” will be displayed.

7. The display will then return to the PAR BACKUP menu.

Select EXIT (SOFT KEY 1) to return to the main menu.

8. The control panel can now be disconnected from the

drive.

Clock Set Mode — The Clock Set mode is used for setting

the date and time for the internal clock of the VFD. In order

to use the timer functions of the VFD control, the internal

clock must be set. The date is used to determine weekdays

and is visible in the fault logs.

To set the clock, perform the following procedure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight CLOCK SET on

the display screen and press ENTER (SOFT KEY 2). The

clock set parameter list will be displayed.

3. Use the UP or DOWN keys to highlight CLOCK VISI-

BILITY and press SEL (SOFT KEY 2). This parameter

is used to display or hide the clock on the screen. Use the

UP or DOWN keys to change parameter setting. Press

OK (SOFT KEY 2) to save the configuration and return

to the Clock Set menu.

4. Use the UP or DOWN keys to highlight SET TIME and

press SEL (SOFT KEY 2). Use the UP or DOWN keys to

change the hours and minutes. Press OK (SOFT KEY 2)

to save the configuration and return to the Clock Set

menu.

5. Use the UP or DOWN keys to highlight TIME FORMAT

and press SEL (SOFT KEY 2). Use the UP and DOWN

keys to change the parameter setting. Press OK (SOFT

KEY 2) to save the configuration and return to the Clock

Set menu.

6. Use the UP or DOWN keys to highlight SET DATE and

press SEL (SOFT KEY 2). Use the UP or DOWN keys to

change the day, month, and year. Press OK (SOFT KEY

2) to save the configuration and return to the Clock Set

menu.

7. Use the UP or DOWN keys to highlight DATE FOR-

MAT and press SEL (SOFT KEY 2). Use the UP or

DOWN keys to change the parameter setting. Press OK

(SOFT KEY 2) to save the configuration and return to the

Clock Set menu.

8. Press EXIT (SOFT KEY 1) twice to return to the main

menu.

I/O Settings Mode — The I/O Settings mode is used for

viewing and editing the I/O settings.

To configure the I/O settings, perform the following

procedure:

1. Select MENU (SOFT KEY 2). The Main menu will be

displayed.

2. Use the UP or DOWN keys to highlight I/O SETTINGS

on the display screen and press ENTER (SOFT KEY 2).

The I/O Settings parameter list will be displayed.

3. Use the UP or DOWN keys to highlight the desired I/O

setting and press SEL (SOFT KEY 2).

4. Use the UP or DOWN keys to select the parameter to

view. Press OK (SOFT KEY 2).

5. Use the UP or DOWN keys to change the parameter set-

ting. Press SAVE (SOFT KEY 2) to save the configura-

tion. Press CANCEL (SOFT KEY 1) to keep the previ-

ous value. Any modifications that are not saved will not

be changed.

6. Press EXIT (SOFT KEY 1) twice to return to the main

menu.

START-UP

General — Complete the start up checklist on page CL-1

before attempting system start-up.

Confirm that compressor suction and discharge service

valves are OPEN. Wait 24 hours before starting the compres-

sors to permit warming by the crankcase heaters.

AFTER 24 hours, continue with the procedures below.

Confirm the Input Power Phase Sequence — The

input power phase rotation sequence must be L1-L2-L3 =

ABC (or forward or clockwise) as indicated with a phase

rotation meter. Incorrect input phase rotation will cause the

compressors to rotate in reverse, which results in no cooling

capacity.

If the compressor is rotating the wrong direction, it may:

emit increased noise; shut down due to internal overload pro-

tection; have only a small decrease in suction pressure when it

starts; or have only a small increase in discharge pressure when

it starts. Also, no cooling will be produced at the evaporator. If

any of these conditions occur, refer to the Installation and Ser-

vice Instructions to correct the compressor rotation before con-

tinuing.

PHASE/VOLTAGE MONITOR (OPTION)

1. Measure the input voltage at the main power terminal

block (TB1).

2. If the measured voltage does not match the indicated volt-

age on the voltage monitor adjustment knob, disconnect

unit power. Rotate the voltage adjustment knob on the

face of the monitor to match the measured voltage. Re-

connect unit power.

Water Fill and Air Purge — If present, water and

steam valves should be opened to fill the unit piping and heat

exchangers. Controlled valves may require a manual override

of control actuators or manual override of the control signal

outputs from the unit control panel or building management

system. Refer to the 50XJ Installation and Service Instructions.

To remove air from the internal piping and heat exchangers,

use the plug ports provided. On the condensers, use the

condenser air vent (bleed valve) in the left side of the fan

compartment (Fig. 10). On the water economizer coil (if pres-

ent), the plug is on top of the supply header and return header,

at the same end as the water connections. On the hot water coil

(if present), the plug is on the top of the return header at the op-

posite end as the water connections. On the steam coil (if pres-

ent), the plug is on the top of the supply header at the same end

as the steam connections.

NOTE: Failure to remove air trapped in the heat exchangers

will result in reduced capacity and/or may initiate system

protection devices.

IMPORTANT: Fan rotation direction can NOT be

used for the phase sequence check; fan rotation for

VAV units with a variable speed drive is independent

of the unit input wiring sequence.

CAUTION

Avoid subjecting the condensers to thermal shock,

excessive pressures and temperatures. These conditions

can impose stress on the condenser, resulting in premature

failure of the heat exchanger as well as other system

components. DO NOT add hot fluid to the unit when it is

cold, or cold fluid when the unit is hot.

OPERATION

Occupancy Determination — The Omnizone™

controller allows several methods of occupancy determination,

based upon the setting of the occupancy configuration. Local

occupancy is determined by either a local schedule (Local

Sched) contained in the controller, the use of the ROCC dis-

crete input point (Remote DI) or by setting the unit configura-

tion to always occupied (Always Occ).

When the Omnizone unit is connected to a network, occu-

pancy can be controlled the occupancy configuration. To oper-

ate to a BACnet schedule, set the configuration to "BACnet

Sched." To use a remote On/Off signal from a building automa-

tion system, set the configuration to "BAS On/Off."

Fan Control — All variable air volume (VAV) units have a

variable frequency drive (VFD) to provide variable fan motor

speed and thus variable airflow. Fan control turns the fan on

and off based on unit operating mode, and controls fan speed to

maintain a particular duct static pressure at a duct static pres-

sure (DSP) sensor. The objective is to maintain a reasonably

constant supply-air exit velocity at VAV system outlet grilles,

regardless of damper opening positions. The duct static pres-

sure sensor is field-installed about 2/3 of the way toward the

"far end" of the ductwork. A duct high static (DHS) limit

switch provides protection by shutting the fan down if the duct

static pressure exceeds a maximum setting.

For the 50XJ unit, a VFD interface display is mounted in

the front of the unit. A number of user-adjustable features can

be entered/changed using the keypad on the display. These fea-

tures are described in detail in the VFD Control and Display

section.

Sequence of Operation — The following control

sequence of operation for the 50XJ unit describes the various

sequences that occur depending upon the way an operation is

triggered and which software control points are involved.

SUPPLY FAN — The supply fan is enabled whenever the unit

enters occupied mode. The fan is also enabled in the unoccu-

pied mode with a cooling or heating demand. Fan operation

will be prevented if there is an active duct high static pressure

alarm, the optional phase rotation monitor indicates a problem,

the duct static pressure sensor has failed or has an alarm, or

there is a fire/smoke shutdown alarm.

When there are no alarms preventing fan operation and the

fan is enabled, the (remote terminal control) TRMCT should

turn on. Thirty seconds later the output to the VFD will in-

crease. The VFD output level is determined by a PID calcula-

tion, based on the duct static pressure (DSP) input and the sup-

ply static pressure set point. Once the supply fan is running and

the static pressure increases above the supply fan status set

point the supply fan status point (SFS) will indicate ON.

The space temperature sensor point indicates the current

value of the sensor used to determine cooling/heating demand.

The sensor selection is based on the sensors installed and the

configuration of these sensors in the custom configuration. The

following sensors, when valid, are used for the space tempera-

ture sensor with the highest precedence at the top of the list:

• Space temperature sensor (SPT)

• Return air temperature sensor (MA_RA) - only used if

the unit is NOT configured for reset by EWT.

• Entering water temperature (EWT) - only if the unit is

configured for reset by EWT.

• Default with no sensors is the occupied cooling set point

of 10 F (prevents unoccupied operation).

If the space has unoccupied demand, the supply fan is en-

abled. If conditions allow, the fan will start as described above.

If the fan is running due to unoccupied heating or cooling de-

mand, the controlling temperature input must rise or drop to

within half way between the occupied and unoccupied set

points in order for the fan to turn back off.

Once the unoccupied conditions are satisfied, there is a

fixed 5-minute delay for normal fan shutdown. During the 5-

minute delay, the cooling and heating routines become dis-

abled. This delay allows a compressor that may have just start-

ed to run for its 5-minute minimum on-time with the supply fan

on. For example, if the staging routine had just started com-

pressor no. 3 at the time the call was satisfied, the cooling rou-

tine would become disabled and compressor no. 1 and 2 would

shut off right away. Compressor no. 3 would continue to run

for its minimum on time of 5 minutes. The fan continues run-

ning until all compressors meet the minimum on time and run

with a load, preventing them from shutting down due to a

safety.

Supply Fan operation with Optional Bypass — If the option-

al VFD bypass is installed and the bypass switch has been

turned to bypass (line), and the VFD compartment access panel

is in place, the software point VFD Access Panel Secure has

been set to YES, there are no faults to prevent fan operation

and there is a call for fan operation, then the bypass start stop

point BPS_S will be engaged to start the fan. The terminal

open point TRMOP will go on with the TRMCT point 30 sec-

onds before the fan starts.

COMPRESSOR COOLING — If the fan is on and there is no

demand for heat, internal software point (COOLOK) will

switch to on. The unit MODE will not change to "Cooling" unit

there is an active call for compressor operation.

If the unit is configured for variable flow the reverse/head

pressure control valve will open (otherwise it will already be

open), and if there is condenser water flow (or no flow switch

installed), then mechanical cooling will be enabled.

Units are equipped with 2, 3, or 4 compressors piped in sep-

arate refrigerant circuits, and staged on/off in a fixed sequential

manner (compressor no. 1 through compressor no. 4). The

compressor control routine uses a PID calculation to determine

the percentage of cooling required, from 1 to 100%. Demand

for the PID calculation is determined from the supply air tem-

perature and the supply air set point.

Compressor cooling will be disabled for any of the follow-

ing reasons:

• There is no water flow (CDWF is off, with switch

installed).

• Economizer freezestat (FREEZ) has been in alarm for

more than 15 minutes.

Fig. 10 — Condenser Air Vent

a50-7124tf

• MODE changes to heat.

• OK-FAN turns off during normal shut down.

During normal compressor operation the minimum on time

is 5 minutes and the minimum off time is 5 minutes.

ECONOMIZER COOLING — The unit diverts condenser

inlet water flow through an optional economizer coil to precool

evaporator entering airflow. This occurs when there is demand

for the cooling, and the temperature at an entering water tem-

perature (EWT) thermistor is colder than the economizer start

set point. Water flow is controlled via two electronic water

flow valves. This option also incorporates an economizer

freeze sensor or switch (economizer temperature/freeze stat),

located at the inlet of the economizer coil.

Economizer water flow is in series with the condensers

allowing compressor operation while the economizer is

operating.

The equipment mode will change to "Free Cooling" if there

is no call for compressor operation, the fan is on, and there is

no demand for heat. If the unit is configured for variable flow

the reverse head pressure control valve will open (otherwise it

will already be open), and if there is condenser water flow, then

economizer cooling is enabled.

If the entering-water temperature is below the economizer

set point then the Mod. Econ Enabled point (ECONOK) will

change to enable and the economizer valve will modulate open

to lower the economizer control temperature to the supply air

set point temperature. The economizer modulation is con-

trolled by a PID loop and the reverse/head pressure control

valve will modulate in reverse of the economizer valve using

the formula MVLV = 100 - ECONO.

COOLING RESET — The controller can reset the supply air

set point using these two methods:

• An external 0 to 10 volt input reset

• The value of the space control point

The external 0 to 10 volt input reset is configured to produce

a 0 to 20 degree supply air reset over the 2 to 10 volt range. If

more than 1.8 volts is sensed on the input, this method of reset

takes priority over other methods.

NOTE: The reset from all methods may be limited from 0 to

20 F by the Maximum Reset set point.

The return-air sensor, space temperature sensor, or entering

water temperature input will be used as the space control point.

If this control input goes below the Occupied Cooling set point,

then for each degree that the point is below the set point value

the supply air set point will be reset by the value configured in

the reset ratio set point.

HEATING — The controller is configured to control either a

hot water/steam valve or electric heat through a modulating

0 to 10 vdc output. A field-supplied and installed step sequenc-

er can convert the modulating signal into two, four, or more

discrete stages of control for non-SCR electric heat control.

For either method of heat to function, a space control point

must be configured in the custom configuration. This control

point comes from a return-air sensor or space sensor, or the en-

tering water temperature sensor.

Whenever the space control point is below the occupied or

unoccupied heat set point the mode will change to heat and if

unoccupied the fan will be started. The heat control routine

uses a PID to control the heating output to maintain the supply

air set point.

When unoccupied heat is enabled the fan will be stopped

and the heat turned off when the space control temperature is

more than halfway above the difference between the occupied

heat set point and the unoccupied heat set point. For example,

if the occupied heat set point is 70 and the unoccupied heat set

point is 60 the unit will come on for unoccupied heating below

60 F and turn off again above 65 F.

HEAD PRESSURE CONTROL (HPC) — In installations

where entering water temperature can fall below 55 F, where a

water economizer (described above) is not installed, the HPC

provides an electronic water flow control valves to vary flow to

the condensers. Controlling the water flow maintains

compressor discharge pressure above a minimum value, ensur-

ing sufficient refrigerant flow out of the condenser and

throughout the refrigerant circuit. Refrigerant pressure is mea-

sured at compressor circuit no. 1 by a discharge pressure sensor

(PRES).

The 50XJ units not equipped with a water economizer can

be ordered with the reverse/head pressure control valve factory

installed and a pressure transducer located in the discharge line

of compressor no. 1.

When the unit is operating, cooling is enabled, a compressor

is engaged, and the entering water temperature falls below

60 F, head pressure control will be enabled. The head pressure

control valve will modulate to keep the head pressure at the Re-

frigerant Head Pressure set point. The default set point is

225 psig and may be set from 200 to 300 psig. The minimum

output value for the head pressure control algorithm is 40% in

order to maintain a minimum flow through the condensers. The

valve will modulate between 40 and 100%.

VENTILATION REQUEST — The ventilation request out-

put will close a set of relay contacts to activate a ventilation

damper whenever the supply fan and supply fan status are both

true and the unit status is occupied or override.

VAV TERMINAL OPERATION OUTPUT — The VAV

terminal control output (TRMCT) closes a set of relay contacts

to indicate to non-Carrier air terminals that the fan is on and op-

eration has been verified. This signals the terminals to open and

start controlling to the desired cfm and temperature set points.

VAV TERMINAL OPEN OUTPUT — The VAV terminal

open output (TRMOP) closes a set of relay contacts to com-

mand the air terminals to open to maximum cfm at times when

the fan is operating on the VFD bypass. This contact will close

30 seconds before the supply starts in bypass mode.

PUMP OUTPUT — The pump output closes a set of relay

contacts to indicate that the 50XJ unit is in operation and may

require condenser water flow through the unit. This contact is

closed when the unit is not in heating mode and the supply fan

is operating. This contact is also close if the economizer freeze

controls (described above) detects unacceptable conditions

with the unit configured without an air economizer or head

pressure control.

TOWER OUTPUT — The tower output closes a set of relay

contacts to start/stop tower controls. This contact closes when

the unit is not in heating mode and the supply fan is operating.

BUILDING PRESSURE CONTROL — The building pres-

sure control output provides an analog 0 to 10 vdc signal to

control return fan or exhaust fan speed. Fan speed is modulated

to maintain the building static pressure set point.

The control parameters for the building pressure set point

and building pressure are read and controlled in voltage but are

converted to inches of water for ease of setting and display. The

range and low start values of the sensor selected should be con-

figured in the setpoint screen, after the use of space static pres-

sure sensor has been enabled on the configuration screen.

Diagnostic Features — The controller and BACview

display provide a number of features to help protect the unit

and allow problem diagnosis.

CRITICAL FAULT — The controller provides an output (for

field connection) to signal an external building systems moni-

tor or control that the unit has a critical alarm that may be im-

pacting unit operation. The alarm lamp on the BACview dis-

play provides visual indication of this condition.

The BACview display allows the user to monitor alarms

and determine sensor input values.

FIRE INPUT (FSD) — This is a normally closed input con-

nected to the controller. When this input is opened, all control

outputs are immediately turned off, including the fan.

DUCT HIGH STATIC INPUT (DHS) — This differential air

pressure switch provides backup protection for the ductwork. It

is factory installed in the unit and wired to the unit controller.

This switch has a manually adjustable set point with a range of

1 to 5 in. wg. Upon switch closure, the controller immediately

turns all outputs off, including fan, and then indicates an alarm

both by turning on its alarm output, the BACview alarm lamp

and via communications (if used).

DIRTY FILTERS SWITCH (FLTS) — This is a factory-in-

stalled option on the 50XJ unit. This input is used to connect a

pressure switch that measures the air pressure difference across

the filters. When the delta increases beyond the preset setting, a

dirty filter alarm is activated, indicating that the filters need

cleaning or replacement.

The switch is normally open, with manually adjustable set-

ting at the switch between 0.5 and 1.5 in. wg. Upon closure,

controller holds the alarm for 1 minute to assure that the condi-

tion is stable and then it activates the alarm. Beyond the alarm,

the dirty filter condition does not affect controller operation, so

the unit should operate normally.

COMPRESSOR OVERLOAD (COL)/SAFETIES — Each

compressor is provided with either an internal line-break over-

current protector or an external overload protection module.

Each compressor control circuit also contains a compressor lock-

out board (CLO), high-pressure switch (HPS), low-pressure

switch (LPS), and evaporator freeze switch (FRZ). Except for

the internal line-break protection, these devices are wired in se-

ries to the contactor for each compressor. A pilot relay is wired in

parallel with the compressor contactor to determine when the

compressor contactor is energized/de-energized.

The compressor lockout board (CLO) is located in the unit

control box, wired in the control line for the compressor contac-

tor, and incorporates a current loop which monitors one leg of the

compressor power leads. This board is powered along with the

related compressor contactor.

Whenever the compressor current falls below a threshold lev-

el (i.e., compressor not operating) on an energized circuit, the

lockout board activates an on-board relay which opens power to

the compressor contactor and pilot relay. The pilot relay contacts

signal the controller with the compressor status. If any of the

safety devices described above opens, the compressor shutdown

sequence is started. In the event this occurs, the controller should

turn off this compressor, and start the next compressor in se-

quence. After a 5-minute period, the controller should restart this

compressor, and turn the other one off, as cooling demand re-

quires. If the “problem” compressor then operates for 10 minutes

of run time normally, the unit reverts to normal operation and

compressor sequencing. If not, and the same error occurs again,

this compressor should be shut down and replaced with the next

compressor, as before, and held off for 10 minutes. It should then

be restarted and the other compressor shut down, as before. If it

does not run successfully for 10 minutes of normal run time

again, it is shut down and replaced a third time. This time it is

held off for 15 minutes. If the "problem" compressor does not

operate successfully for the 10 minutes of normal run time this

third time, this compressor ONLY is shut down and locked out

for servicing. A compressor lockout alarm is generated and the

BACview alarm lamp is turned on.

HIGH-PRESSURE SWITCH (HPS) — This switch is located

in the discharge refrigerant line of each compressor, and is set

to open at pressures above 570 psig. It is wired in the 24-vac

control power line of the compressor contactor (in series with

the LPS and FRZ) and disables compressor operation when it

opens.

LOW-PRESSURE SWITCH (LPS) — The low-pressure

switch (LPS) is located in the suction refrigerant line of each

compressor, and is set to open at pressures below 27 psig. The

LPS is wired in the 24-vac control power line of the

compressor contactor (in series with the HPS and FRZ) and

disables compressor operation when it opens.

EVAPORATOR FREEZE SWITCH (FRZ) — The evaporator

freeze switch (FRZ) is a thermal disk type switch, mounted on

a return bend of the evaporator, refrigerant circuit for which

corresponds to each respective compressor, and is set to open at

temperatures below 28 F. The FRZ is wired in the 24-vac con-

trol power line of the compressor contactor (in series with the

LPS and HPS) and disables compressor operation when it

opens.

COMPRESSOR EXTERNAL OVERLOAD PROTEC-

TION MODULE — This board is provided with each com-

pressor that does not include internal line-break overload pro-

tection. When installed, this board is in the compressor termi-

nal box. This board activates at an over temperature setting,

and locks out operation of the compressor for 30 minutes; there

is no method to override or reset this timer. Due to this timing

function, please note that the compressor will not attempt to re-

start until the third attempt described above.

COMPRESSOR INTERNAL LINE-BREAK OVERLOAD

PROTECTION MODULE — Some compressors are built

with internal line-break protection. When the winding tempera-

ture exceeds the protector setting, the protector opens two of

the three power lines within the compressor. This protector

keeps the compressor locked out until the winding temperature

falls below the protectors reset temperature. There is no meth-

od to override or reset this protector, except by lowering the

winding temperature. Under some circumstances, the compres-

sor may not attempt to restart until the third attempt described

above.

ALARMS — There are four methods to annunciate alarms:

BACview alarm lamp, BACview alarm display, network com-

munications, or the discreet alarm output dry contacts. Alarms

are covered in detail in the Troubleshooting section.

TROUBLESHOOTING

Standard Diagnostic Features, Alarms and

Alarm Lamps — Unit reset of alarm failure operation is

automatic when fault is cleared, except as noted.

SUPPLY AIR TEMPERATURE ALARM — If supply air

temperature input falls outside the range of 25 to 150 F, the

alarm output will close and the red alarm lamp will be lit. An

alarm with an ID of "sat_alarm" will be generated, but the unit

will operate normally.

SUPPLY AIR TEMPERATURE SENSOR FAILURE — If

the supply air temperature sensor fails the system will display a

supply-air temperature of 0.00° F, the compressor outputs will

be disabled, the alarm output will close and the red alarm lamp

will be lit. An alarm with an ID of "sat_sen_alarm" will be

generated.

DUCT STATIC PRESSURE ALARM — If the duct static

pressure input falls outside the range of 0.06 to 5.45 in. wg, the

alarm output will close and the red alarm lamp will be lit. An

alarm with an ID of "dsp_alarm" will be generated, but the unit

will operate normally.

DUCT STATIC PRESSURE SENSOR FAILURE — If the

duct static pressure sensor fails, the system will display 0.00 in.

wg, the controller outputs will be forced off, the alarm output

will close and the red alarm lamp will be lit. An alarm with an

ID of "dsp_sens_alarm" will be generated.

DUCT HIGH STATIC INPUT (DHS) — This factory-

installed air switch provides over pressurization protection for

the ductwork. The switch is a normally open switch, with ad-

justable manual setting (range is 1 to 5 in. wg with a default of

3.0 in. wg). Upon switch closure, the controller outputs will be

forced off, the alarm output will close and the red alarm lamp

This manual suits for next models

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