Zonex ZonexCommander User manual

1
Installation and Applications Manual
Part #ZCMAN
ZonexCommander
ZonexCommander(Plus)
Network All Your HVAC Equipment
Centralized DDC Communications
for Stand-Alone HVAC and Zoned Systems
Rev. Oct 2014

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Table of Contents Page
Commander System Overview.....................................................................................................................................................................................3
System Selection Criteria.............................................................................................................................................................................................3
ZONEXCOMMANDER
ZONEXCOMMANDER (PLUS)
Unit Relay Module (RMOD)
OPTIONAL COMPONENTS
ZONE DAMPERS
Component Descriptions.........................................................................................................................................................................................4-5
Concept Drawing................................................................................................................................................................................................6
Component Selection Guide................................................................................................................................................................................7
Sequence Of Operation.......................................................................................................................................................................................8
Installation Instructions......................................................................................................................................................................................9
DIGICOM / DIGIHP Thermostats ................................................................................................................................................................10-11
Command Center – ZonexCommander.............................................................................................................................................................12
Wiring Overview ..............................................................................................................................................................................................13
Concept Drawing .............................................................................................................................................................................................14
Component Selection Guide..............................................................................................................................................................................15
Wiring Overview ..............................................................................................................................................................................................16
Sequence Of Operation ...............................................................................................................................................................................17-18
Command Center – ZonexCommander (Plus) .................................................................................................................................................19
Installation Instructions....................................................................................................................................................................................20
ModStat Thermostat and Supplemental Heat Applications............................................................................................................................21-22
Sequence Of Operation.............................................................................................................................................................................23
RMOD Terminal Diagram ........................................................................................................................................................................24
Description / Installation..........................................................................................................................................................................25
Wiring Overview – RMOD ........................................................................................................................................................................26
RMOD To Unit Wiring Diagram.................................................................................................................................................................27
SENDCOM – Communicating Duct Temperature Sensor .............................................................................................................................28-29
Communicating Relay Module (RLYCOM).........................................................................................................................................................30
Round Dampers ...............................................................................................................................................................................................31
Rectangular Dampers..................................................................................................................................................................................32-33
D-Fuser ...........................................................................................................................................................................................................33
Sizing................................................................................................................................................................................................................34
Slaving..............................................................................................................................................................................................................34
Bypass Dampers .........................................................................................................................................................................................35-36
Static Pressure Controller. ...........................................................................................................................................................................37-38
System Start-Up – Commander Software Review ........................................................................................................................................39-48
Trend And Data Logging Operation ..............................................................................................................................................................49-50
Troubleshooting....................................................................................................................................................................................................51
Operating Schedule..............................................................................................................................................................................................52

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COMMANDER SYSTEM OVERVIEW
SYSTEM SELECTION CRITERIA
Are you using zone dampers on this job?
NO, control your stand-alone equipment with a ZonexCommander.
YES, use a ModCom or a ZonexCommander (Plus).
Stand-Alone Unit Applications
ZONEXCOMMANDER
1. How many units are on this project?
2. Are units Gas Electric or Heat Pump?
3. Are there any generic loads to control (pumps, lights, or fans)?
4. Is a Network/Internet communication required?
5. Proceed to the ZonexCommander Component Selection Guide,
and insert the above answers to develop a bill of materials for your
control system composed of stand-alone RTUs or split systems.
1. How many zones are on each unit?
2. How many stand-alone units are in this application?
3. What size dampers are needed?
4. What size and how many bypass dampers are needed?
5. Are there any generic loads to control and schedule (pumps, fans or
lights)?
6. Is Network/Internet communication required?
7. Proceed to the ZonexCommander (Plus) Component Selection
This manual covers the design and installation for the ZonexCommander
systems. ZonexCommander is a communicating Windows-based DDC
system designed to remotely control 1 – 80 RTUs, split systems or zones.
The systems can control stand-alone HVAC equipment, zoned units with
fully modulating or two-position zone dampers and auxiliary equipment
such as exhaust fans, lighting or other generic loads scheduled via the
ZonexCommander software.
Zonex is designed to network one or multiple zoned units on one
two-wire twisted pair for remote communications over the Internet in
buildings too large for multiple programmable thermostats but too small
for a full blown energy management system.
1. ZonexCommander – Controls stand-alone HVAC equipment 1-80 units
constant volume and VAV systems.
following features to enhance control and management of the facility
remotely or on-site as follows:
– On-site or remote control of all HVAC equipment
– Remotely collect and view temperature data, RA/SA from any unit
– Monitor or change every thermostat remotely, individually or globally
– Schedule each thermostat for two occupied and two unoccupied
periods per day
– Remotely lock thermostats individually or globally
– Vacation scheduling for 20 events of up to 30 days in duration
– Provide scheduled occupied and unoccupied operation of generic
devices (pumps, lights, fans, and more)
– Print reports for thermostat setpoints, zone or room temperatures
– Trend logging capability
– Remote system control with simple Windows operating software
To select the proper Zonex system for your application please answer the following questions:
2. ZonexCommander (Plus) – designed to centralize control of multiple
Two versions of the product are available:
Systems utilize Zonex Windows-based software and provide the
– Alarming
Guide.
ZONEXCOMMANDER (PLUS) – for Multiple Zoned and
Stand-Alone Units
Communications with these systems are accomplished with a computer
connected directly to the system or over the Internet. A dedicated on-site
computer is not required to operate any ZonexCommander.

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ZONEX COMPONENT DESCRIPTIONS
providing remote communication with all RTUs or splits in your
system. The ZonexCommander eliminates the need to continually set
building. ZonexCommander bridges the gap between ineffective
stand-alone thermostats and expensive and complex automation systems.
COMMAND CENTERS
The Command Center is a microprocessor based digital communicating
controller. Each Command Center supports up to 20 devices (thermostats
ZonexCommander
ZonexCommander (Plus)
The Command Centers communicate with the computer through the RS-232
link, and communications with thermostats or devices communicate
through the RS-485 link using a daisy chained two-wire twisted pair
(Belden 8740).
not affected by power interruptions.
The Command Centers are powered by dedicated 24vac 40va, field
supplied transformers. Each Command Center must have its own
Part #CETCIP
network device, for 20 communicating devices.
ZONEXCOMMANDER COMMAND CENTER
ZPTCIP – ZonexCommander (Plus) Communications Package with
ZONEXCOMMANDER (PLUS) COMMAND CENTER
ZonexCommander (Plus) is designed to provide centralized control
support up to 16 HVAC units with 80 zones. The thermostats are allo-
cated to the RMOD controller through ZonexCommander (Plus)
software.
RMODs and another 20 additional communicating devices.
CZNXIP Command Center with TCIP – supports 4 additional
RMOD controllers, eachcontrolling one HVAC unit. CZNXIP Com-
mand Centers via TCIP device provide expansion capability to
to 20 devices (ModStat, MODS2, DIGICOM thermostats and
for multiple zoned HVAC systems. Each Command Center supports up
For use with ZonexCommander (Plus) systems only
capacity control. The
with the Command
Center and thermostats
assigned to that RMOD.
Each thermostat can
to the RMOD. The RMOD
polls the number of heat
or cool calls every
minute and energizes
the unit based on our
control algorithm of
controls a zoned GE or
RMOD communicates
HP unit with on-board
send a heat or cool call
The DIGICOM and DIGIHP thermostats are used to control stand-
A unique Command Center exists for each communicating Zonex System::
CETCIP – ZonexCommander Communications Package with TCIP
first call first served, majority wins on changeover..
COMCIP – Command center with TCIP – adds 20 additional com-
municating devices for larger systems.
THERMOSTATS
RLYCOMs). Each ZPTCIP Command Center controls up to four
RMOD – UNIT RELAY MODULE
alone Gas Electric (2H/2C) or Heat Pump (3H/2C) HVAC systems.
transformer power supply.
and reset multiple programmable thermostats located throughout yourr
The ZonexCommander automates and networks 1-80 HVAC units,
Please review integral components of the Zonex Systems below.
and RLYCOMrelay modules).
Each Command Center maintains Day, Date, Time and Year with battery
tags and addresses are programmed into non-volatile memory, which is
backup. All Occupied, Unoccupied and Vacation schedules, device name
Each Command Center can support 4 RMODs. Each Universal RMOD
TCIP network device for internet communications, for 1-4 RMODs
with 20 communicating devices. Includes system operating software.

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ZONEX COMPONENT DESCRIPTIONS
Commander software and have a manual two-hour override. When
the thermostats are “locked,” the setpoints can be adjusted locally by
The Heat / Cool setpoints and address assignments are stored in
non-volatile memory to insure recovery in the event of a power inter-
ruption. Thermostats are powered with 24vac, and communication is
through the RS-485 twisted pair (Belden 8740) communication wire.
COMMUNICATION WIRE SPECIFICATION RS-485
The Commander System sends and receives data from the Command
Center to all communicating devices through a 2-conductor twisted pair
RS-485 link (Belden 8740). The communication wire has a maximum
run length of 4,000 L Ft. The communication link is a vital component
of any DDC system, and it must be installed correctly using the correct
wire for the specific application.
For standard applications the basic twisted pair (Belden 8740) wire is
used, which is daisy chained to each communicating device. For
installations with any potential for electrical interference such as caused
shielded twisted pair (Belden 8450) should be used to insure clean
communications.
OLAT - 5vdc OUTSIDE AIR SENSOR
The LAT Thermistor sensor assembly is provided with the Zonex-
Commander and ZonexCommander (Plus) Command Centers to
provide the Outside Air Temperature which is displayed on the System
screen of the ZonexCommander/Commander (Plus) program.
COMPUTER SPECIFICATIONS
A dedicated on-site “control” computer is not required. All of the
ZonexCommander Family of control systems are accessed by Windows
OPTIONAL DEVICES
SENDCOM Sensor
The SENDCOM is a microprocessor
based communicating air duct
device is used to display Supply and
requires a SENDCOM to display
Return and Supply air temperature for
that particular system. This data is
transmitted to and displayed on the
Commander software.
The SENDCOM is designed for installation on the supply duct, with a
remote sensor for the return duct. The SENDCOM does not use a
dedicated address on the communication link; it piggybacks a
thermostat address and displays data when that thermostat number
temperature.
device equipped with two SPDT relays,
which are used for controlling fans,
pumps, blowers, lighting, etc. The
devices to be cycled ON and OFF
by programmed schedules in the
Commander software. Status is
displayed on the REVIEW screen for
dedicated address from 01 to 20. The load applied to the relay
mode and de-energize in the Unoccupied mode.
TCIP Network Device
LAT – 5vdc TEMPERATURE SENSORS
no more than 2° above or below the locked setpoints.
setpoints, system status, override and thermostat address.
The Zonex thermostats are microprocessor
control zone dampers.
(2-position) are zone thermostats, which
The ModStat (modulating) and MODS2
System through the Internet or Ethernet Network using an assigned
IP address and Port Forwarding.
The Network device includes
installation software and the
Commander Network version
operating software.
The factory set Heat and Cool setpoints are 70° and 75°, and the factory
set address is 25. Thermostats can be electronically "locked" by the
the iServer with power supply,
Communicating Supply and Return Air Temperature Sensors
RLYCOM
The RLYCOM is a communicating
RLYCOM enables these auxiliary
verification. Each RLYCOM uses a
contacts must not exceed one amp at 24vac. The RLYCOMis designed
based, auto changeover, digital commu-
nicating thermostats. The thermostats
have a large, easy-to-read LCD display
with a distinctive grey backlight. The
display is designed to clearly indicate
by large transformers, VFDs, ballasts and other electrical devices,
LAT sensors are used on the RMOD and SENDCOM devices
for Return and Supply Air temperature sensing. The Supply
and Return sensors provide data to the RMOD and ModCC /
CMod for proper system capacity control and HI/LO limiting. The
SENDCOM has a supply sensor, which is factory installed in the
sensor is included for field installation on the return plenum.
enclosure for supply plenum installation; and the remote return
The TCIP device provides communication with the Commander
operating systems. Our systems can be easily accessed with a direct
connected computer or the optional TCIP device for Internet or
Ethernet access.
temperature sensor. This optional
Return air on stand-alone HVAC
systems. Each stand-alone HVAC system
is selected by double clicking over that thermostat's current room
to switch 24vac circuits only. The relays energize in the Occupied
based Laptop or Desktop computers using Windows 7, 8,XP or Vista
space temperature from 57°to 92°, heat and cool

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ZonexCommander is a DDC system for automating and networking new and existing stand-alone HVAC systems and mechanical devices. Gas Electric
and Heat Pump HVAC units are controlled with communicating thermostats while mechanical devices are controlled with a relay device (RLYCOM).
Each of these devices can be scheduled through the simple Windows-based ZonexCommander software and communicate to the Command Center
via a daisy-chained 2-wire twisted pair communications link.
ZONEXCOMMANDER CONCEPT DRAWING
Twisted Pair Communications Wire (Belden #8740)
DIGICOM or DIGIHP Thermostat
Standard 18-ga. Thermostat Wiring to Unit
1
2
3
4
ZonexCommander Command Center (Part #CETCIP)

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ZONEXCOMMANDER COMPONENT SELECTION GUIDE
SYSTEM
NUMBER OF THERMOSTATS
Up to 20
from above)
THERMOSTATS
Gas/Electric Heat Pump
DIGICOM
(2H/2C)
DIGIHP
(3H/2C)
ZonexCommander
Remotely control 1-80 stand-alone rooftops or split systems
COMMUNICATING ACCESSORIES (Optional)
STAND-ALONE
EQUIPMENT
COMMAND CENTER
21 to 80
additional 20 Thermostats
Stand-Alone Equipment
SENDCOM
Duct Temperature Sensor
(1 per HVAC unit)
Communicating
Relay Device
RLYCOM
CETCIP Communications package
(Use 1 – CETCIP
1 – CETCIP Communications Package
1 – COMCIP Command Center per
Includes: Command Center, software, TCIP Device, cables and LAT Sensor

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SYSTEM OVERVIEW
ZonexCommander is a DDC system for automating and networking new
and existing stand-alone HVAC systems and mechanical devices.
The ZonexCommander networks 1-20 RTUs, AHUs, Heat Pumps, or split
systems per Command Center with an expansion capability of up to 80 units.
Gas Electric and Heat Pump HVAC units are controlled with communicat-
ing thermostats (DIGICOM / DIGIHP), while mechanical devices are
controlled with a relay device (RLYCOM). Each of these devices can be
scheduled through the simple Windows-based ZonexCommander
software and communicated to the Command Center via a daisy-chained
2-wire twisted pair communications link (Belden 8740).
The Command Center has available inputs for outside air temperature
display; and, with the addition of a SENDCOM sensor, each unit’s Return
Air and Supply Air temperature is remotely displayed on the Commander
software. This information may also be trend logged via the Zonex-
Commander Trending Program, included with your Commander software.
ZonexCommander allows you to instantly communicate and
remotely control every unit in your system.
OPERATION
The ZonexCommander Command Center polls all devices every minute
to register information on operation in the Command Center. DIGICOM
and DIGIHP thermostats place calls to HVAC units based on thermostat
setpoint.
Cool Call
The DIGICOM and DIGIHP thermostats will initiate a Y1 cool call when
the space temperature rises 1° above the Cool setpoint. The fan will also
be energized on “G.” On 2-stage systems, Y2 will be energized when the
space temperature rises 2° above the Cool setpoint. Y1 and Y2 will remain
energized until the active cool call is satisfied at setpoint.
When the DIGIHP thermostat is configured for “O” reversing valve on an
active cool call, “O” will energize on call for cool and will remain energized
until a heat call is made. When the DIGIHP is configured for “B” reversing
valve, there is no signal from the O/B terminal on an active cool call.
Heat Call
The DIGICOM and DIGIHP thermostats will initiate a 1st stage heat call
(W1 or Y1 & G) when the space temperature drops 1° below the Heat setpoint.
2nd stage heat is energized (W2 or Y2 & G) when the space temperature
drops 2° below the Heat setpoint. The DIGICOM thermostat does not
energize “G” for fan on a heat call unless the thermostat has been
configured for FAN ON in the Occupied mode.
On the DIGIHP thermostat, when the temperature drops 3° below the
heat setpoint, the auxiliary heat will be energized on W2 and G, along
with Y1 and Y2. When Emergency Heat is selected, Y1 and Y2 are
de-energized; and W2 and “G” are energized.
When the DIGIHP thermostat is configured for “O” reversing valve on an
active heat call, the O/B output will be de-energized. When the DIGIHP
is configured for “B” reversing valve on a call for heat, “B” will energize
the reversing valve and will remain energized until a call for cool is made.
Occupied/ Unoccupied
A schedule for Occupied and Unoccupied operation is made through the
ZonexCommander Windows-based software. This schedule will
communicate with thermostats to reset temperature setpoints of thermostats
for occupied and unoccupied time. Each thermostat can have its own
occupied and unoccupied schedule and thermostat setpoints. The Zonex-
Commander Windows-based software allows for seven-day programmability
with two occupied and two unoccupied time periods per day.
Thermostat Lock Feature
The DIGICOM / DIGIHP thermostats can be electronically locked
either individually or globally through the ZonexCommander program.
When a thermostat is in the Lock mode, the address number on the left
column of the Review screen on the Zonex software will be in red. The
thermostat will also display the Lock mode with a padlock symbol on the
upper left of the LCD display. When in the Lock mode, the thermostat can
be locally controlled providing heating or cooling changes ±2° from Heat
or Cool setpoint. The 2-hour override is operational in the Lock mode.
Schedule Override
The DIGICOM / DIGIHP thermostats provide a 2-hour override in the
Unoccupied mode. When the thermostat goes into the Unoccupied mode,
the backlight automatically goes off, and Unoccupied is displayed. When
the Select button on the thermostat is pressed in the Unoccupied mode,
the backlight energizes and the 2-hour override to Occupied begins. To
terminate the 2-hour override, press the Select button again, which
returns the thermostat to the Unoccupied mode.
schedule input on the Commander software. When the Command Center
Center sends an Unoccupied call, the RLYCOM de-energizes. Manual
SENDCOM
SENDCOMs work in conjunction with their assigned thermostats. To
review SENDCOM information, double click on an assigned thermostat’s
current room temperature. Supply and Return air temperatures will
appear on the REVIEW page for this SENDCOM, if a SENDCOM was
installed in this application.
ZONEXCOMMANDER SEQUENCE OF OPERATION
The RLYCOM energizes and de-energizes two SPDT relays based on the
sends an Occupied call, the RLYCOM energizes. When the Command
RLYCOM
RLYCOMS may be utilized to control additional devices or loads.
changes are performed from the Toggle button on the RLYCOM. When
the red LED is illuminated, the RLYCOM is energized. Multiple

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3. When the installation calls for an on-site, direct connected computer,
the Command Center must be located within 10’ of the computer if the
4. Install a 24vac 40va dedicated transformer for each individual
Command Center, and wire to terminals “G” and “B.” (See Fig. 1)
6. A single air sensor (OLAT) is supplied to display the Outside Air
Temperature on the System screen of the Commander program. It
7. The twisted pair communication wire (Belden 8740) is to be daisy
chained to each communicating device, which is controlled by the
specific Command Center. When multiple Command Centers are used,
each Command Center is to have a dedicated communication loop.
The communication loop is polarity sensitive on RX and TX. Wire
nuts are never to be used on the communication wire. When
splicing wire, use screw type terminal strips or solder.
NOTE: for systems with potential electrical interference, such as
large transformers, VFDs, etc, shielded twisted pair (Belden 8450)
may be used for the communications loop.
ZONEXCOMMANDER INSTALLATION INSTRUCTIONS
Fig.1
1. Install the CETCIP Command Center on a wall or mounting board
in a dry interior space where the ambient temperatures will be between
32° and 125° non-condensing.
2. When installing multiple Command Centers, mount all boards
together on the same surface.
NOTE: 120vac outlets are required for the TCIP iServer device power
supplies.
5. For system TCIP configuration, you must provide a 120vac outlet for
CETCIP Command Center
the power supply.
which is field provided.
USB cable is used. The TCIP device requires an Ethernet cable,
NOTE: Power supply voltage on G and B should be 24 to 28vac.
leads must be extended, simply use standard 18/2 thermostat wire,
and connect to the S S terminals on the Command Center.
should be installed where it will not be in direct sunlight. If the sensor

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DIGICOM / DIGIHP THERMOSTATS
DESCRIPTION
The Zonex Systems DIGICOM and DIGIHP are
microprocessor based, auto changeover, stand-
The DIGICOM and DIGIHP are very easy to configure through the
system program or to make manual adjustments using the buttons located
on the front cover.
These thermostats feature an onboard thermistor for precise tempera-
ture measurement. In the event of power loss, the Heat and Cool set-
points are stored in a non-volatile memory, without the need for bat-
tery backup.
The space ambient temperature is continually displayed with large,
Programmed setpoints can be manually adjusted at the thermostat or
electronically locked through the system program to provide limited
manual setpoint adjustment. Two-hour override is provided for
after-hours temporary operation with a touch of a button.
INSTALLATION
Thermostat and terminal base
1. The thermostat is to be installed on an interior wall, away from drafts,
supply air currents and direct sunlight or any heat generating source.
2. To remove the thermostat cover, grasp the cover at the top and pull
straight off; do not pivot the cover from the base.
3. Install the thermostat terminal base to the wall using the provided
anchors and screws. The thermostat can also be mounted on a 2x4
electrical box using two #6-32” screws.
Wiring
The Zonex Systems DIGICOM and DIGIHP thermostats have been
specifically designed to make wall mounting and wire connections very
easy. The thermostat terminal base has two separate terminal blocks: the
left side terminal block is for the 24vac control circuits, and the right
side terminal block is for the RX TX communication circuits. There are
two sets of RX TX terminals on the base to make daisy chain wiring from
device to device straightforward and simple.
1. Use minimum 18-gauge AWG thermostat wire for the 24vac control
circuits. The load on these circuits must not exceed 1 amp. The voltage
range on R and C must not exceed 28vac.
2. Connect the communication wires to the RX TX terminals. There are
2 sets of RX TX terminals for “daisy chain” installation of this circuit.
The communication wire specification is twisted pair (Belden 8740)
or shielded twisted pair wire (Belden 8450).
NOTE: When using shielded twisted pair wire (Belden 8450), just
connect the shield conductors together, as there is no electrical
connection on the thermostat base terminals. The shield will be landed
on the Command Center on the G or TR2 terminal.
Fig. 1
DIGICOM
DIGIHP
Fig. 2
H
V
A
C
U
N
I
T
SPDT, 24V
AC Relay
C
G
R
RGW1
4
2
5
1
3
Fig. 3
Blower Fan Relay
For electrical heat applications, which require a fan output on a call for
heat. (See Fig 3.)
with no dampers in the system. The DIGICOM is
the Gas Electric version and has two-stage heat /
cool outputs with selectable fan operation. The
DIGIHP Heat Pump thermostats have two-stage
cool and three-stage heat outputs with selectable
fan. The DIGICOM and DIGIHP thermostats have a large, easy-to-read
LCD display with a distinctive gray backlight. The display backlight is
continuously illuminated in the Occupied mode and goes off in the Un-
alone thermostats used to control stand-alone units
occupied mode.
easy-to-read numbers. The DIGICOM temperature display range is
Fan mode, Heat or Cool setpoints and operation modes are all indicated
on the display.
57°to 90°F., and the DIGIHP temperature display range is 57°to 90°F.

11
Configuration
1. Set the unique address for each thermostat from 01 to 20.
2. Press and hold the Menu button until you see the system mode
display on the lower right begin to scroll and change modes; then
press and hold the Heat/Cool button with the Menu button.
3. When the display shows “address” and the setpoint temperature
MANUAL ADJUSTMENTS
Heat and Cool Setpoint Display
Press the Heat/Cool button to display the Heat or Cool setpoint temperatures.
Temperature Setpoints
COOL Setpoint
1. Press the Heat/Cool button to display the
Cool setpoint on the upper right.
2. Press the UP or DN buttons to change the
Cool setpoint.
HEAT Setpoint
1. Press the Heat/Cool button to display the
Heat setpoint on the upper right.
2. Press the UP or DN buttons to change the
Heat setpoint temperature.
FAN Mode
To change the FAN operation to AUTO or ON, press the UP and DN
buttons together, once to toggle fan operation.
HVAC system mode
To select Heat, Cool, Auto, Emergency Heat (HP only) or OFF, press and
hold the Menu button; and when the desired mode is displayed, press
and hold the Select button; then release both to confirm mode.
Override
When the system is in the Unoccupied mode, the thermostat provides a
2-hour override for after-hours system operation. To select the 2-hour
override, press the Select button and note “Override” indicated on the
display, along with the backlight coming on. When additional override is
required, press the Select button again.
Calibration
When re-calibration is required, press and hold the Heat/Cool and
Select buttons simultaneously (the screen will flash). Then press the UP
button once to increase temperature 1°, or press the DN button once to
decrease the temperature 1°. If additional calibration is required, repeat
this step.
THERMOSTAT OPERATION
Display
The grey display backlight is constantly illuminated in the Occupied mode.
The display backlight goes off when in the Unoccupied mode. When in the
Unoccupied mode, if any button is pressed, the backlight will illuminate
for 5 seconds. If the thermostat is placed into the override mode, the
backlight will illuminate until the 2 hours times out. To terminate
override, press the Select button again.
COOL – DIGICOM / DIGIHP: The thermostat will make a Y1 cool call
when the space temperature rises 1° above the cool setpoint. Y2 will
energize when the space temperature rises 2° above the cool setpoint.
When the room temperature is less than 2°from setpoint, Y2 de-energizes.
Y1 de-energizes at setpoint. O or B is energized for the reversing valve
circuit, depending on configuration. The G circuit is energized for fan.
HEAT – DIGICOM: The thermostat will make a W1 heat call when the
space temperature is 1° below the heat setpoint. W2 will energize when
the space temperature is 2° below the heat setpoint. When the room
temperature rises to within 2° of the heat setpoint, W2 de-energizes.
W1 de-energizes at setpoint.
NOTE: The “G” fan circuit on the DIGICOM thermostat is not energized
in the Heat mode unless the fan is set for ON operation.
HEAT – DIGIHP: The thermostat will make a Y1 heat call when the space
space temperature is 2° below the heat setpoint. E (aux heat) will
energize when the space temperature is 3° below setpoint. When the
room temperature rises to within 2° of the heat setpoint, E (aux heat)
de-energizes. When the room temperature rises to within 1°, Y2
de-energizes. Y1 de-energizes at setpoint.
Emergency Heat – DIGIHP: When Emergency heat is selected on the
DIGIHP thermostat, on a call for heat, there is an output signal on “E”
for backup heat and “G” for the fan. The compressor circuits “Y1” and
“Y2” are locked out during heat calls until Auto, Heat or Cool mode is
selected. The thermostat display will indicate when Emergency Heat has
been selected.
DIGICOM – FAN operation for electric heat applications: A pilot relay
may be required to energize the fan for heat operation on electric heat
applications. This relay is a 24vac coil – SPST and is field supplied. The coil
is energized from W1 and C from the DIGICOM thermostat terminal base.
DIGICOM / DIGIHP THERMOSTATS
changes to the address number, release Heat/Cool and Menu buttons
and press the UP or DN button to raise or lower the number.
Reversing Valve Mode
DIGIHP (O&B) is factory set at "O" and can be field configured for "B"
reversing valve operation. For "B" mode reversing valve (reversing valve
energized in the heat mode), press and hold the Heat/Cool and Select
temperature is 1° below the heat setpoint. Y2 will energize when the
buttons; then press and release the Menu button once. Release the Heat/
Cool and Select buttons. The ° symbol next to the set point display
should disappear. Repeat steps above to go back to "O."

12
COMMAND CENTER – ZONEXCOMMANDER
LEGEND
DATE AND TIME BACKUP BATTERY
SENSOR CALIBRATION:
R12 OUTSIDE AIR (OA)
POWER LED INDICATOR
MAIN CONTROL CHIP ZONEXCOMMANDER
USB COMPUTER
COMMUNICATION RS-485 TWISTED PAIR (POLARITY SENSITIVE)
(BELDEN 8740)
OUTDOOR AIR SENSOR TERMINAL
TERMINALS G AND B, 24VAC 40VA INPUT
ON/OFF SWITCH
1
2
3
4
5
6
7
8
9

13
ZONEXCOMMANDER WIRING OVERVIEW
ROOFTOP UNITS: UP TO 20 PER COMMAND CENTER

14
devices. The universal RMOD controls both Gas Electric and Heat Pump units with onboard capacity control. The modulating/two-position
thermostats (ModStat and MODS2) are used to communicate calls for heat and cool, as well as modulate dampers based on zone demand.
The ZonexCommander (Plus) system can be applied to existing HVAC systems or new installations providing central control of HVAC operations
using Windows-based ZonexCommander (Plus) software.
The ZonexCommander (Plus), ZPTCIP, is a DDC system for automating multiple zoned HVAC systems, stand-alone HVAC units and mechanical
* Concept Drawing Only. See Wiring Schematic on Page 16
ZONEXCOMMANDER (PLUS) CONCEPT DRAWING *

15
ZONEXCOMMANDER (PLUS) COMPONENT SELECTION GUIDE

16
ZONEXCOMMANDER (PLUS) INSTALLATION WIRING DIAGRAM
NOTE: Each Command Center supports up to 4 RMODs and a maximum of 20 communicating devices. When the application requires more than
H
V
A
C
U
N
I
T
SPDT, 24V
AC Relay
C
G
R
RGW1
4
2
5
1
3
BLOWER FAN RELAY
Fig. 2
Fig. 1
ELECTRIC HEAT FAN CYCLING
AUXILIARY BLOWER FAN RELAY
When W1 is energized from the DIGICOM, ModCC or RMOD, the fan
circuit (G) is not energized. For applications requiring the blower to be cycled
The W1 output signal is connected to the heating device input terminal and the
coil of the fan relay. This is required for electric heat and gas furnaces with no
fan control. (See Fig. 2)
on a W1 heat output, a field supplied, 24-volt coil SPDT relay must be used.
All RX communication wires must be connected to the RX terminals.
All TX communication wires must be connected to the TX terminals.
The RX and TX wires should never intersect.
4 RMODs or more than 20 communicating devices, additional Command Center(s) will be required. There must be separate communications circuit
(twisted pair Belden 8740) for each Command Center (channel). (See Fig. 1)

17
ZONEXCOMMANDER (PLUS) SEQUENCE OF OPERATION
SYSTEM OVERVIEW
for communication and control with the zoning and stand-alone
provides interface between the communicating system and a Windows-
modulating zones totaling 20 system devices. Twenty thermostats are
available to be allocated to the 1-4 RMODs associated with each
Command Center. Communication is accomplished through a
two-conductor twisted pair RS-485 link (Belden 8740), which is daisy
chained between all system communicating components.
OPERATION
The ZonexCommander (Plus) Command Center polls every minute.
When the Command Center polls, it goes to each ModStat to gather
information on whether it is making a cool call, heat call or no call. Based
on this information the Command Center then sends calls for cool, heat
or no call to RMOD and ModStats.
ModStat/MODS2
Cool Call
If room is one or more degrees above setpoint, a call for cool will be
made to the Command Center. If a majority of thermostats assigned to
the same RMOD is calling for cooling, the Command Center will
communicate to RMOD to make a call for cool. Command Center will
also send a mode call to all thermostats assigned to this RMOD for cool.
This tells ModStat what the system mode is so that damper control may
be made. If the room is calling for cooling and the RMOD is in the cool
mode, the ModStat will modulate the dampers calling and closed to sat-
isfy room demand. If the room temperature is two or more degrees above
setpoint, the damper will be between 100% and 0% open, based on room
load desire. If using a MODS2 with a two-position damper, the damper
will be open. When call is satisfied, the damper will close.
Heat Call
ModStats will place a call for heat if room temperature is two or more degrees
below setpoint. When the Command Center polls, if there is a majority call
for heat from ModStats that are assigned to the same RMOD and the
system is not in cooling mode, then the Command Center will communicate
a call for heat to the RMOD and a heat call will be initiated. If there is a
current call for cooling and a majority heat call has been received, a
changeover sequence will begin. After two minutes the cool call will end,
a two-minute purge will start, and at the end of the purge a heat call will
be made. The Command Center will communicate a heat mode call to the
is two degrees or more below room temperature, ModStat will modulate
the damper to 100% open. If the room temperature is within two degrees
of setpoint, the ModStat will control the damper from 100% open to 0%
open based on deviation of setpoint. If using a MODS2 in the heat mode,
the damper will be open.
Auxiliary Heat
the AUX heat output will energize initiating auxiliary heat.
RMOD
When heating or cooling calls are sent to the RMOD Relay Module by the
thermostat, the RMOD will treat these calls as votes to determine mode of
Cool Mode
If the majority of calls are for cooling, the RMOD will energize Y1 and G
for 1st stage cooling. After four minutes, the RMOD will check the
leaving air temperature. If the leaving air temperature is 10°above cutout
compressor safety.
Heat Mode
If the majority of calls are for heating, the RMOD will energize W1 for 1st
stage heating. After four minutes, the RMOD will check the leaving air
temperature. If the leaving air temperature is 15°below high limit cutout
(145° - 15° = 130°F), then W2 will energize. W2 will stage off at 5°
below temperature cutout (145° - 5° = 140°F), and W1 will stage off on
high temperature at 145°F.
Changeover
If the system is running in one mode and the majority of calls change to
the other mode, a timer will start. The RMOD will give the current
operating mode another four minutes to try to satisfy the zone(s). It will
then go into the purge cycle before switching modes to the majority.
The ZPTCIP is the primary Command Center, which provides a source
thermostats, along with various communicating devices. The ZPTCIP
based PC computer over the Internet. Included with the ZPTCIP are a
TCIP driver, Operating Software, Cables, and Sensor.
The ZPTCIP Command Center manages 1 to 4 HVAC systems with
to expand communication for an additional 20 devices per each
The CZNXIP controller is the ZPTCIP Command Center without software
CZNXIP Command Center. When using additional CZNXIP Com-
mand Centers, an additional TCIP device and an individual IP
address must be used for interface communications.
RMOD, and ModStats will control dampers. If the room temperature
If the space temperature drops 2°F below the Heat setpoint temperature,
operation. Adjustable factory limits are 45°F cool and 145°F heat.
(45° + 10° = 55°F), then Y2 will energize. Y2 will stage off 4° above
cutout (45° + 4° = 49°F) and Y1 will stage off on low temperature at
45°F. A four-minute off delay between operations is provided for

18
ZONEXCOMMANDER (PLUS) SEQUENCE OF OPERATION
Purge Mode
When a heat or cool call is satisfied or before changing modes, the
RMOD will go into a three-minute purge cycle. The call for heat or cool
will be removed, and the dampers will remain in their last position to
allow time for air to adjust to room temperature before going into
ventilation mode or changeover.
Fan Operation
Fan operation in the ZonexCommander (Plus) is controlled by the RMOD.
The fan jumper on RMOD allows for the option of fan continuous in
Occupied and intermittent in Unoccupied. Fan intermittent can be selected in
both Occupied and Unoccupied modes. Place fan jumper in desired position.
Ventilation
When no zone is calling for heat or cool, the dampers will open 50%. This
permits ventilation in all zones if the blower fan is on continuously.
COMMUNICATION FAILURE
If the RMOD cannot communicate with any of the thermostats, it will
control the HVAC unit based on return air temperature. The RMOD will
try to maintain 70°F heat and 75°F cool return air.
TEMPERATURE LIMITS AND STAGING
The RMOD monitors the leaving air temperature for staging and Hi /Low
145° F. Staging is based on the limit settings.
Gas Electric & Heat Pump
Example:
Gas Electric
Heating W2 cut-in temperature is high limit minus 15° F (145° – 15° =
130° F). The W2 cut-out is cut-in plus 10° F (130° + 10° = 140° F).
Example:
Adjustable high limit = 145°
W2 Cut-in = 130° F (high limit minus fifteen)
W2 Cut-out = 140° F (cut-in plus ten)
W1 cut out = 145°
Heat Pump
Heating – When the RMOD is configured for HP operation, the high
cut-out is automatically set to 121°.
• W2 energizes when the SA temperature is 88° or less after 4 minutes
of run time. W2 de-energizes when the SA temperature rises to 100°.
• Y2 energizes when the SA temperature is below 100° after 2 minutes
of run time and de-energizes above 115°.
• Y1 cuts out for 4 minutes when the SA temperature is above 120°.
TEMPERATURE LIMIT ADJUSTMENT
Low Limit –
1. Push DN button until display shows C.
2. Current setpoint will be displayed.
3. Push UP or DN button until desired setpoint is displayed.
4. Release button.
1. Push UP button until display shows H.
2. Current setpoint will be displayed.
3. Push UP or DN button until desired setpoint is displayed.
4. Release button.
operation. A shorted sensor or wiring will display low temperature, and
RLYCOM
The RLYCOM energizes and de-energizes the two SPDT relays based on
the schedule input on the Commander software. When the Command
Center sends an Occupied call, the RLYCOM energizes. When the
Command Center sends an Unoccupied call, the RLYCOM de-energizes.
When the red LED is illuminated, the RLYCOM is energized.
Supply and Return Air Temperature Display
System supply and return air temperatures can be read from each RMOD
and the REVIEW screen of the ZonexCommander (Plus) program. On the
REVIEW screen simply double-click on the Current
Room Temperature of
address 1, 2, 3, 4. The address number is displayed on the left hand
column. The Read Sensors Screen will appear with the supply and return
temperatures for the specific RMOD.
Address: 1 = RMOD 92
2 = RMOD 93
3 = RMOD 94
4 = RMOD 95
SENDCOM sensor.
SENDCOM
On the ZonexCommander (Plus) system, the supply and return
temperatures from the stand-alone DIGICOM and DIGIHP thermostats
are provided by the SENDCOM. One SENDCOM is installed for each
stand-alone system. When assigning addresses for the stand-alone
thermostats and SENDCOMs, you must start at #75 through #90
(5 through 20). The first 4 address numbers on the program are for
SENDCOMs associated with the 4 RMODs only. Pay particular attention
to this issue. Each RMOD has a SENDCOM associated with it. If 4
RMODs are utilized with 1 Command Center, the information from those
SENDCOMs will be retrieved on the Zonex software from thermostat
locations 1, 2, 3, or 4.
NOTE: The RA and SA air sensors (P# LAT) must be installed for unit
To obtain this information from stand-alone equipment, include a
High Limit –
Manual changes are performed from the Toggle button on the RLYCOM.
an open sensor or wiring will display high temperature.
limit. The adjustable factory low limit is 45° F and the high limit is
Cooling Y2 cut-in temperature is low limit plus 10°F (45° + 10° = 55°F).
The Y2 cut-out is cut-in minus 8°F (55° – 8° = 47°F).
Adjustable low limit = 45°F
Y2 Cut-in = 55°F (low limit plus ten)
Y2 Cut-out = 47°F (cut-in minus eight)

19
COMMAND CENTER – ZONEXCOMMANDER (PLUS)
LEGEND
DATE AND TIME BACKUP BATTERY
SENSOR CALIBRATION:
R12 OUTSIDE AIR
POWER LED INDICATOR
MAIN CONTROL CHIP ZONEX COMMANDER (PLUS)
COMMUNICATION RS-485 TWISTED PAIR
(POLARITY SENSITIVE) (BELDEN 8740)
SENSOR TERMINAL
OA (OUTSIDE AIR) ONLY
TERMINALS G AND B, 24VAC 40VA INPUT
ON/OFF SWITCH
1
2
3
4
5
6
7
8
9
USB COMPUTER

20
3. If the installation calls for an on-site computer to be directly
4. Install a 24vac 40va dedicated transformer for each individual
Command Center, and wire to terminals “G” and “B.” Power supply
voltage on G and B should be 24 to 28vac.
6. The only sensor connected to the Command Center is the Outside Air
Sensor (OA), which is Part # OLAT. The Outside Air Sensor is not
polarity sensitive.
The outside air temperature is displayed on the SYSTEM screen in the
7. The twisted pair communication wire (Belden 8740) is to be daisy
chained to each communicating device, which is controlled by the
each Command Center is to have a dedicated communication loop.
The communication loop is polarity sensitive on RX and TX. Wire
nuts are never to be used on the communication wire. When
making connections, use screw type terminal strips or solder.
NOTE: for systems with potential electrical interference, such as
large transformers, VFDs, etc, use shielded twisted pair (Belden
8450) for the communications loop.
ZONEXCOMMANDER (PLUS) INSTALLATION INSTRUCTIONS
Fig. 1
ZONEXCOMMANDER (ZPTCIP / CZNXIP)
ZPTCIP/CZNXIP Command Centers
1. Install the Command Center on a wall or mounting board in a
non-condensing.
dry interior space where the temperatures will be between 32-125°
2. When additional Command Centers are used, mount all together
on the same wall or mounting board.
connected to the Command Center, the computer must be located
5. For system TCIP configuration, you must provide a 120vac outlet
for the power supply.
Commander program.
specific Command Center. When multiple Command Centers are used,
within 10 feet of the Command Center.