York MAXE YST Quick start guide

PRODUCT DRAWING
CONTRACTOR _______________________ PURCHASER ____________________________________________
ORDER NO. _________________________ JOB NAME ______________________________________________
YORK CONTRACT NO. _________________ LOCATION _____________________________________________
YORK ORDER NO. ____________________ ENGINEER ______________________________________________
 REFERENCE DATE ________
Supersedes: 160.67-PW2 (204) Form 160.67-PW2 (1007)
WIRING DIAGRAM
FIELD CONTROL MODIFICATIONS
MAXE™ MODEL YST CHILLERS (STYLE F)
JOB DATA:
CHILLER MODEL NO. YST ______________ CHILLER MODEL NO. YST ______________
NO. OF UNITS _____________ NO. OF UNITS _____________
Included by YORK®for Field Installation (by others) are: YES NO PER UNIT
Condenser Liquid Low Pressure Differential   ________
Chilled Liquid Low Pressure Differential Switch   ________
Tachometer (On Optional Turbine Gaugeboard)   ________
___________________________________   ________
 APPROVAL DATE ________  CONSTRUCTION DATE ________
ENERGY MANAGEMENT SYSTEMS
MaxE™chiller design allows for ease of interfacing with
Energy Management Systems (EMS). The OptiView™
Control Center includes unit status contacts, provisions
for remote control inputs and provisions for remote
setpoint reset of leaving chilled liquid temperature and
horsepower limit for EMS interfacing. Refer to para-
graph 4 on page 2.
Five sets of unit status contacts are factory furnished
through a field wiring terminal board in the OptiView™
Control Center. Each set of contacts are single pole,
normally open, rated at 5 amperes resistive at 240VAC.
Chiller status contacts are provided for the unit:
• Remote Mode Ready to Start - Refer to FIG. 1.
• Cycling Shutdown - Refer to FIG. 2.
• Safety Shutdown - Refer to FIG. 3.
• Run (System Operating) - Refer to FIG. 4.
• Anticipatory Alarm - Refer to FIG. 5.
Three sets of inputs are available to the EMS, allowing
for remote control of unit operation. Input device contact
rating shall be 5 milliamperes at 115 VAC. Field wiring
terminal board (TB4) in the OptiView™Control Center
permits connection for the following operation:
• Remote Stop Contacts - Refer to FIG. 6.
• Remote Start Contacts - Refer to FIG. 6.
• Remote/Local Cycling Devices (Controlled Shut-
down) Refer to FIG. 7.
It is possible to limit the power consumption of the chiller
indirectly or directly by the following methods.
1. Chilled liquid pump control contacts (Refer to Notes
7 & 8 on Page 15) are provided, allowing for efficient
automatic operation of the chilled liquid pump to
reduce energy. The chilled liquid pump is not started
until after the turbine has been slow rolled, when the
ramp-to-rated speed is initiated. It is run during opera-
tion and coast down then automatically stopped 70
seconds after the drivetrain has coasted to a complete
stop.

JOHNSON CONTROLS
2
FORM 160.67-PW2 (1007)
2. Reduce the steam turbine load (as well as the steam
usage) by raising the leaving chilled liquid tempera-
ture through remote temperature control setpoint in
the "remote" operating mode. Refer to FIG. 14 when
the remote temperature reset is accomplished by
supplying a 1 to 11 second pulse-width modulated
signal. Jumper configurable analog inputs are avail-
able for remote temperature reset via a 0 to 20 or 4
to 20mA DC currnet signal (FIG.13), and a 0 to 10
or 2 to 10VDC signal (FIG.12).
3. Control the maximum allowable turbine horsepower
from 30% to 100% through remote horsepower limit
setpoint. Refer to FIG. 11 when the remote horse-
power limit is accomplished by supplying a 1 to 11
second pulse-width modulated signal in the "remote"
operating mode. Jumper configurable analog inputs
are available for remote horsepower limit setpoint
via a 0 to 20 or 4 to 20mA DC current signal (FIG.
10), and a 0 to 10 or 2 to 10 VDC signal (FIG. 9).
4. A Johnson Controls Metasys or other 3rd Party
Control System may be interfaced with the chiller
OptiView™Control Center via the MicroGateway
card which may be installed in the Control Center.
All temperatures, pressures, safety alarms and cy-
cling information known to the OptiView™Control
Center are then available to the 3rd Party System
for integrated chiller plant control, data logging, and
Local/Remote operator displays. The YORK®Micro-
Gateway card also allows the remote stop/start, and
reset of the chillers's horsepower limit and leaving
chilled liquid temperature setpoints.
External wiring, unless specified as
an optional connection in the manu-
facturer's product literature, is NOT
to be connected inside this cabinet.
Furthermore, auxiliary devices such
as relays, switches, transducers and
controls may NOT be installed inside
this enclosure. All wiring must be in
accordance with YORK's published
specifications and must be performed
only by qualified personnel. YORK
will NOT be responsible for damages
resulting from improper connection
to these controls or application of
improper control signals. Failure
to follow this warning will void the
manufacturer's warranty and may
cause serious damage to property or
injury to persons.
ENERGY MANAGEMENT SYSTEMS (CON'T)

FORM 160.67-PW2 (1007)
3
JOHNSON CONTROLS
LIST OF FIGURES
FIG. 1 - REMOTE MODE READY TO START CONTACTS ......................................................................................4
FIG. 2 - CYCLING SHUTDOWN CONTACTS...........................................................................................................4
FIG. 3 - SAFETY SHUTDOWN CONTACTS.............................................................................................................4
FIG. 4 - RUN CONTACTS .........................................................................................................................................5
FIG. 5 - ANTICIPATORY ALARM CONTACTS .......................................................................................................... 5
FIG. 6 - REMOTE START-STOP CONTACTS FROM ENERGY MANAGEMENT SYSTEM.................................... 5
FIG. 7 - REMOTE/LOCAL CYCLING DEVICES (CONTROLLED SHUTDOWN) .....................................................6
FIG. 8 - CONDENSER FLOW SENSORS ................................................................................................................6
FIG. 8A - PADDLE TYPE FLOW SENSOR...............................................................................................................7
FIG. 8B - CONDENSER LIQUID PRESSURE DIFFERENTIAL SWITCH ................................................................7
FIG. 9 - REMOTE HORSEPOWER LIMIT SETPOINT W/ 0-10VDC OR 2-10VDC SIGNAL....................................7
FIG. 10 - REMOTE HORSEPOWER LIMIT SETPOINT W/ 0-20MA OR 4-20MA SIGNAL....................................... 8
FIG. 11 - REMOTE HORSEPOWER LIMIT SETPOINT W/ PWM SIGNAL .............................................................. 8
FIG. 12 - REMOTE LEAVING CHILLED LIQUID TEMPERATURE SETPOINT
W/ 0-10VDC OR 2-10 VDC SIGNAL..........................................................................................................9
FIG. 13 - REMOTE LEAVING CHILLED LIQUID TEMPERATURE SETPOINT
W/ 0-20MA 0R 4-20MA SIGNAL...............................................................................................................10
FIG. 14 - REMOTE LEAVING CHILLED LIQUID TEMPERATURE SETPOINT W/ PWM SIGNAL ........................ 11
FIG. 15 - EXTERNAL SIGNAL FOR REFRIGERATION UNIT FAILURE ................................................................ 11
FIG. 16 - AUXILLIARY SAFETY SHUTDOWN INPUT............................................................................................ 12
FIG. 17 - EVAPORATOR FLOW SENSORS...........................................................................................................12
FIG. 17A - PADDLE TYPE FLOW SENSORS ........................................................................................................ 12
FIG. 17B - EVAPORATOR LIQUID PRESSURE DIFFERENTIAL SWITCH ........................................................... 13
FIG. 18 - TACHOMETER ........................................................................................................................................13
FIG. 19 - CHILLED LIQUID FLOW TRANSMITTER ...............................................................................................14
FIG. 20 - CONDENSER LIQUID FLOW TRANSMITTER ....................................................................................... 14
FIG. 21 - STEAM FLOW TRANSMITTER...............................................................................................................14
FIG. 22 - TURBINE CONDENSATE DRAIN TANK HIGH LEVEL SWITCH ............................................................15

JOHNSON CONTROLS
4
FORM 160.67-PW2 (1007)
LD08972
FIG. 1 – REMOTE MODE READY TO START
CONTACTS
REMOTE MODE READY TO START CONTACTS
When closed, these contacts signify the following:
1. The OptiView™Control center is in "Digital", "Ana-
log" or "ISN" remote operating mode, allowing for
energy management system or remote start/stop
control (FIG. 6).
2. All chiller safety cutout control are in the normal
position, so they will allow the unit to start.
3. All chiller cycling shutdown controls are in the nor-
mal position, so they will allow the unit to start.
4. The OptiView™Control Center COMPRESSOR
switch is in the "RUN" ( l) position.
5. A closure of the Remote Ready to Start Contacts then
signifies that the unit shall start when the Energy
Management System maintains the Remote Stop
Contact (FIG. 6) open and momentarily closes the
Remote Start Contacts (FIG. 6). When the Remote
Mode Ready to Start contacts close, the OptiView™
Control Center will display the following message:
"SYSTEM READY TO START".
LD06821
FIG. 2 – CYCLING SHUTDOWN CONTACTS
CYCLING SHUTDOWN CONTACTS
When closed, these contacts signify the unit is NOT
permitted to start due to a CYCLING shutdown condi-
tion. The unit will automatically resart after the cycling
condition is NO longer present. YORK Operating and
Maintenance Manual 160.67-O1 provides a list and ex-
planation of all cycling shutdowns. While these contacts
are closed, the OptiView™control Center will display
"CYCLING SHUTDOWN - AUTO RESTART" on the
System Status Bar and the cause of the shutdown on the
Systems Details Bar of the display. Cycling Shutdown
contacts function in all operating modes.
LD06823
FIG. 3 – SAFETY SHUTDOWN CONTACTS
SAFETY SHUTDOWN CONTACTS
When closed, these contacts signify the unit is NOT
permitted to start due to a SAFETY shutdown condi-
tion. Safety shutdowns require a manual reset procedure
performed before the unit can be restarted. YORK Op-
erating and Maintenence Manual 160.67-O1 provides
a list and explanation of all Safety shutdowns. While
these contacts are closed, the OptiView™Control Center
will display "Safety Shutdown - Manual Restart" on the
System Status Bar and the cause of the shutdown on
the System Details Bar of the display. These contacts
will remain closed until the safety condition NO longer
exists and a manual reset is performed by placing the
OptiView™Control Center COMPRESSOR Switch
in the Stop-Rest position (O). The unit can then be
restarted. Safety Shutdown contacts function in all
operating modes.

FORM 160.67-PW2 (1007)
5
JOHNSON CONTROLS
LD06822
FIG. 4 – RUN CONTACTS
RUN CONTACTS
When closed, these contacts signify that the unit has
been started, the prelube has been completed, and the
turbine slow roll may be started. If the turbine trip valve
has opened, the OptiView™Control Center will display
the message "READY TO BEGIN SLOW ROLL".
LD04604
FIG. 5 – ANTICIPATORY ALARM CONTACTS
ANTICIPATORY ALARM CONTACTS
These contacts will close whenever one or more
WARNING condition occurs. They will remain closed
as long as the condition is in effect. On most warnings,
the contacts automatically open when the condition is
NO longer present. On some Warnings, the contacts
will open only after the condition is NO longer present
and the WARNING RESET Key is pressed in Operator
(or higher) access level.
YORK Operating and Maintenance Manual 160.67-
O1 provides a list and explanation of all WARNING
conditions that will close these contacts.
LD06824
FIG. 6 – REMOTE START-STOP CONTACTS FROM
ENERGY MANAGEMENT SYSTEM
REMOTE START AND STOP CONTACTS FROM
ENERGY MANAGEMENT SYSTEM
When the OptiView™Control Center is in the "Digital",
"Analog" or "ISN" remote operating mode and the
COMPRESSOR switch is in the "RUN" (ı) position,
with the Remote Stop Contacts open, and the Remote
Mode Ready to Start Contacts closed (FIG. 1), the unit
will start via a closure of the Remote Start Contacts. A
subsequent closure of the Energy Management System
Remote Stop Contacts causes the chiller to shutdown
after a controlled shutdown sequence has been com-
pleted. The OptiView™Control Center will display
"REMOTE STOP" because the Energy Management
System Remote Stop Contacts has commanded the unit
to shutdown.
It is recommended that maintained contacts be used for
both START and STOP.
Even when the chiller is applied with
Remote Start-Stop (when the Control
Center is in the "Remote Operating
Mode"), an EMERGENCY STOP by
an operator or others can STOP the
compressor from the OptiView Con-
trol Center and prevent the chiller
from restarting. However, the operator
cannot locally start the compressor us-
ing "Compressor" start switch, when
the Control Center is in the "Remote"

JOHNSON CONTROLS
6
FORM 160.67-PW2 (1007)
LD06825
FIG. 7 – REMOTE/LOCAL CYCLING DEVICES
(CONTROLLED SHUTDOWN)
REMOTE/LOCAL CYCLING DEVICES
(CONTROLLED SHUTDOWN)
The closure of an automatic reset device across this
input will permit the unit to operate in all operating
modes. Conversely, an opening of the device contacts
will inhibit the unit from operating; the OptiView™Con-
trol Center will then display the following massages:
"CYCLING SHUTDOWN - AUTO RESTART" and
"SYSTEM CYCLING - CONTACTS OPEN".
A "Controlled Shutdown" initiated by
the opening of these contacts while the
chiller is running causes the speed to
be reduced, the compressor pre-rota-
tion vanes to close, and the hot gas
bypass valve to open prior to tripping
the turbine. A subsequent closure
of these contacts will initiate a start
sequence.
CONDENSER FLOW SENSORS
The chiller is supplied with a thermal conductivity type
flow sensor factory installed in the condenser liquid
outlet nozzle.
The Thermal-Type flow sensor interfaces with the
microboard. The paddle type flow sensor or Differential
Pressure Switch interfaces with the I/O board.
For the program to read the appropriate inputs for the
flow sensor status, the actual flow sensor type used must
be entered at the keypad using Service Access Level.
Enter "Analog" for thermal-type or "Digital" for paddle-
type or differential pressure switch. Refer to Operation
manual 160.67-O1.
With any of the flow sensors, when condenser liquid
is flowing, the Flow Switch contact will close. Open-
ing of the condenser liquid flow switch contacts for
30 continuous seconds will cause unit shutdown. The
Flow Switch Status is checked 45 seconds into "System
Prelube" and continuously thereafter. The OptiView™
Control Center will display the following message:
"CYCLING SHUTDOWN - AUTO RESTART" and
"CONDENSER FLOW SWITCH OPEN".
THERMAL TYPE FLOW SENSOR
When the Thermal-type flow switch is used, the flow
switch uses the cooling effect of liquid to sense flow.
When the flow of liquid is sensed, the solid-state re-
lay output is turned ON conduction current through
the microboard load resistor to the +5Vdc Applying
>+4Vdc to the microboard input J7-16.
When no flow of liquid is sensed, the solid state re-
lay output is turned off, this results in <1Vdc to the
microboard input and a unit shutdown after a 30 second
delay.
J7-
MICROBOARD
THERMAL-TYPE FLOW SENSOR
11
1
TB4
LD9133
FIG. 8 – CONDENSER FLOW SENSORS
I/O BOARD PADDLE-TYPE FLOW SENSOR
OR DIFFERENTIAL PRESSURE SWITCH

FORM 160.67-PW2 (1007)
7
JOHNSON CONTROLS
LD06827
FIG. 8A – PADDLE TYPE FLOW SENSOR
PADDLE TYPE FLOW SENSORS
If desired, a paddle type flow switch can be applied.
Flow Switch - Johnson Controls type F61MG-1C,
max. 150 psi (YORK P/N 024-26116-000) available
at additional cost.
LIQUID
LD13176
FIG. 8B – CONDENSER LIQUID PRESSURE
DIFFERENTIAL SWITCH
CONDENSER LIQUID PRESSURE DIFFERENTIAL
SWITCH
If desired, a condenser liquid pressure differential
switch can be applied:- Pretempco DPS300A or Potter
1382, max. 300 psi (YORK P/N 025-30919-000).
REMOTE HORSEPOWER LIMIT SETPOINT
with 0-10 VDC, 0-20mA or Pulse Width Modu-
lation Signal
The remote Horsepower Limit setpoint can be reset
over the range of 100% to 30% of the Horsepower
Limit PID Local Setpoint by supplying (by others)
a 0-10VDC, 2-10VDC, 0-20mA, 4-20mA or 1 to 11
second Pulse Width Modulation (PWM) signal to the
OptiView™Control Center. The OptiView™Control
Center must be configured appropriately to accept the
desired signal type as follows:
• The appropriate Remote Mode must be selected:
"Analog" Remote Mode MUST be selected when
using a voltage or signal input. "Digital Remote
Mode" MUST be selected when using a PWM
input.
• If "Analog" Remote Mode is selected, the Remote
Analog Input Range setpoint MUST be set to "0-
10VDC" or 2-10VDC" as detailed below, regardless
of whether the signal is a voltage or current input
signal type.
• Microboard Program Jumper JP23 must be pos-
tioned appropriately per the input signal type as
detailed below. It is recommended that a qualified
Service Technician position this jumper.
IMPORTANT!! The signal type
used for Remote Horsepower Limit
Setpoint reset and the signal type used
for Remote Leaving Chilled Liquid
Temperature setpoint reset must be
the same. for example, if a 0-10VDC
signal is being used for Remote
Leaving Chilled Liquid Temperature
Reset, then a 0-10VDC signal must
be used for Remote Horsepower Limit
Reset.
SIGNAL
COMMON 5
1
+
J22
LD04498
FIG. 9 – REMOTE HORSEPOWER LIMIT SETPOINT
WITH 0-10VDC OR 2-10VDC SIGNAL
0-10 VDC - As shown in FIG. 9 connect input to
Microboard J22-1 (signal) and J22-5 (gnd). The setpoint
varies linearly from 100% to 30% as the input varies
from 0-10VDC. This input will only be accepted when
"Analog" Remote Mode is selected, the "Remote Ana-
log Input Range" setpoint is set for 0-10 Volts, and
Microboard Program Jumper JP23 has been removed.
Calculate the setpoint for various inputs as follows:
SETPOINT (%) = 100 - (VDC X 7)
For example, if the input is 5 VDC, the setpoint would
be set to 65% as follows:
SETPOINT (%) = 100 - (5x7) = 100 - 35 = 65%
LIQUID

JOHNSON CONTROLS
8
FORM 160.67-PW2 (1007)
2-10 VDC - As shown in FIG. 9 connect input to
Microboard J22-1 (signal) and J22-5 (gnd). The setpoint
varies linearly from 100% to 30% as the input varies
from 2 to 10VDC. This input will only be accepted
when "Analog" Remote Mode is selected, the "Remote
Analog Input Range" setpoint is set for 2-10 Volts, and
Microboard Program Jumper JP23 has been removed.
Calculate the setpoint for various inputs as follows:
SETPOINT (%) = 100 - [(VDC - 2) x 8.75]
For example, if the input is 5 VDC, the setpoint would
be set to 74% as follows:
SETPOINT (%) = 100 - [(5 - 2) x 8.75]
= 100 - (3 x 8.75)
= 100 - 26.25 = 74%
SIGNAL
COMMON 5
2
+
J22
LD04499
FIG. 10 – REMOTE HORSEPOWER LIMIT SETPOINT
WITH 0-20mA OR 4-20mA SIGNAL
0-20mA - As shown in FIG. 10 connect input to
microboard J22-2 (signal) and J2-5 (gnd). The setpoint
varies linearly from 100% to 30% of the Horsepower
Limit PID Local Setpoint as the input varies from 0mA -
20mA. This input will only be accepted when "Analog"
remote Mode is selected, the "Remote Analog Input
Range" setpoint is set for 0-10 Volts, and Microboard
Program Jumper JP23 has been placed on pins 1 and 2.
Calculate the setpoint for various inputs as follows:
SETPOINT (%) = 100 - (mA x 3.5)
For example, if the setpoint is 8mA the setpoint would
be as follows:
SETPOINT (%) = 100 - (8 x 3.5)
= 100 - 28 = 72%
4-20mA - As shown in FIG. 10, connect input to
microboard J22-2 (signal) and J2-5 (gnd). The setpoint
varies linearly from 100% to 30% as the input varies
from 4mA to 20mA. This input will only be accepted
when "Analog" Remote Mode is selected, the "Re-
mote Analog Input Range" setpoint is set for 2 - 10
Volts and Microboard Program Jumper JP23 has been
placed on pins 1 and 2. Calculate the setpoint for vari-
ous inputs as follows:
SETPOINT (%) = 100 - [(MA - 4) x 4.375
For example, if the input is 8mA, the setpoint would be
set to 83% as follows:
SETPOINT (%) = 100 - [(8 - 4) x 4.375
= 100 - (4 x 4.375)
= 100 - 17.5
= 82.5
=83%
TB3 181
LD13186
FIG. 11 – REMOTE HORSEPOWER LIMIT SETPOINT
WITH PWM SIGNAL
PWM - The Pulse Width Modulation input is in the form
of a 1 to 11 second relay contact closure that applies
115VAC to the I/O Board TB3-81 (signal) for 1 to 11
seconds. As shown in FIG. 11, connct dry closure relay
contacts between I/O Board TB3-81 (signal) and TB4-1
(115 VAC). The setpoint varies linearly from 100% to
30% as the relay contact closure time changes from 1
to 11 seconds. The relay contacts should close for 1 to
11 seconds at least once every 30 minutes to maintain
the setpoint to the desired value. If a 1 to 11 second
closure is not received within 30 minutes of the last
closure, the setpoint is defaulted to 100%. A closure
is only accepted at rates not to exceed once every 70
seconds. This input will only be accepted in "Digital"
Remote Mode. Calculate the setpoint for various pulse
widths as follows:
SETPOINT (%) = 100 -[(Pulse Width in Seconds-1) x 7)

FORM 160.67-PW2 (1007)
9
JOHNSON CONTROLS
For example, if the relay contacts close for 3 seconds,
the setpoint would be set to 86% as follows:
SETPOINT = 100 - [(3-1) x 7]
= 100 - (2 x 7)
= 100 - 14
= 86%
REMOTE LEAVING CHILLED LIQUID SETPOINT
with 0-10VDC, 2-10VDC, 0-20mA, 4-20 mA or
Pulse Width Modulation Signal
Remote Leaving Chilled Liquid Temperature Setpoint
Reset can be accomplished by supplying (by others)
a 0-10VDC, 2-10VDC, 0-20mA, 4-20 mA or 1 to 11
second Pulse Width Modulated (PWM) signal to the
Control Center. The Leaving Chilled Liquid Tempera-
ture Setpoint is programmable over the range of 38°F
to 70°F (water applications), 36°F to 70°F (water ap-
plications with Smart Freeze Protection enabled) or
10°F to 70°F (brine applications).
The Remote Input Signal changes the setpoint by cre-
ating an offset above the locally programmed Leaving
Chilled Liquid Temperature Base Setpoint value. The
setpoint can be remotely changed over the range of
10° or 20ºF (as per the locally programmed Remote
Reset Temperature Range setpoint) above the Local
Leaving Chilled Liquid Temperature Setpoint. For ex-
ample, if the Local Setpoint is 40°F and the Remote
Reset Temperature Range setpoint is programmed
for 10°F, the Leaving Chilled Liquid Temperature
setpoint can be remotely reset over the range of 40°F
to 50°F. The Control Center must be configured ap-
propriately to accept the desired signal type as fol-
lows:
• The appropriate Remote Mode must be selected:
Analog Remote Mode must be selected when using
a voltage or current signal input. Digital Remote
Mode must be selected when using a PWM input.
• If Analog Remote Mode is selected, the Remote
Analog Input Range setpoint must be set to “0-
10VDC” or “2-10VDC” as detailed below, regard-
less of whether the signal is a voltage or current
signal type.
• Microboard Program Jumper JP24 must be po-
sitioned appropriately per the input signal type
as detailed below. It is recommended a qualified
Service Technician position this jumper.
SIGNAL
COMMON 5
3
+
J22
LD04500
FIG. 12 – REMOTE LEAVING CHILLED LIQUID TEMP.
SETPOINT WITH 0-10VDC OR 2-10VDC
SIGNAL
0-10VDC - As shown in FIG. 12, connect input to
Microboard J22-3 (signal) and J22-5 (gnd). A 0VDC
signal produces a 0°F offset. A 10VDC signal provides
the maximum offset )10°F or 20°F above the local
setpoint value). The setpoint is changed linearly be-
tween these extremes as the input varies linearly over
the range of 0VDC to 10VDC. This input will only be
accepted when "Analog" Remote Mode is selected,
the "Remote Analog Input Range" setpoint is set for
0 - 10 Volts, and Microboard Program Jumper JP24
has been removed. Calculate the setpoint for various
inputs as follows:
OFFSET
(
°F) = (VDC)(REMOTE RESET TEMP. RANGE)
10
SETPOINT (
°
F) = LOCAL SETPOINT + OFFSET
For example, if the input is 5VDC and the remote Reset
Temperature Range setpoint is programmed for 10
°
F and
the Local Leaving Chilled Liquid Temperature setpoint is
programmed for 40
°
F, the setpoint would be set to 45
°
F as
follows:
OFFSET (
°
F) = 5 x 10
10
= 50
10
= 5
°
F
SETPOINT (
°
F) = 40 + 5
= 45
°
F
2-10VDC -As shown in FIG. 12, connect input to Microboard
J22-3 (signal) and J2-5 (gnd). A 2VDC signal produces a
0
°
F offset.A 10 VDC signal produces the maximum allowed
offset (10
°
F or 20
°
F above the Local Setpoint Value). The
setpoint is change linearly between these extremes as the
input varies over the range of 2VDC to 10VDC. This input
will only be accepted when "Analog" Remote Mode is

JOHNSON CONTROLS
10
FORM 160.67-PW2 (1007)
selected, the "Remote Analog Input Range" setpoint is
set for "2-10VDC" and the Microboard Program Jumper
JP24 has been removed. Calculate the setpoint for various
inputs as follows:
OFFSET (°F) = (VDC - 2)(Remote Reset Temp. Range)
8
SETPOINT (
°
F) = Local Setpoint + Offset
For example, if the input is 5VDC and the Remote Reset
Temp. Range Setpoint is programmed for 40
°
F, the setpoint
would be set to 43.8
°
F.
OFFSET (F) = (5 - 2)(10)
8
= (3)(10)
8
= 30
8
SETPOINT (
°
F) = 40 + 3.8
= 43.8
°
F
SIGNAL
COMMON 5
4
+
J22
LD04501
FIG. 13 – REMOTE LEAVING CHILLED LIQUID TEMP.
SETPOINT WITH 0-20mA OR 4-20mA SIGNAL
0-20mA - As shown in FIG. 13, connect input to Microboard
J22-4 (signal) and J22-5 (gnd). A 0mA signal produces a 0
°
F
offset.A 20mA signal produces the maximum allowed offset
(10 or 20
°
F above the local setpoint value). The setpoint is
changed linearly between these extremes as the input varies
over the range of 0-20mA. This input will only be accepted
when "Analog" Remote Mode is selected, the "Remote
Analog Input Range" setpoint is set for "0-10VDC" and
microboard Program Jumper J24 has been placed on pins 1
and 2. calculate the setpoint for various inputs as follows:
OFFSET (°F) = (mA)(Remote Reset Temp. Range)
20
SETPOINT (°F) = Local Setpoint + Offset
For example, if the input is 8mA, the Remote Reset Temp.
Range Setpoint is programmed for 10
°
F and the Local Leav-
ing Chilled Liquid Temperature setpoint is programmed for
40
°
F, the setpoint would be set to 44
°
F as follows:
OFFSET (F) = (8)(10)
20
= (80)
20
= 4F
SETPOINT (F
°
) = 40 + 4
= 44
°
F
4-20mA - As shown in FIG. 13, connect input to Microboard
J22-4 (signal) and J22-5 (gnd). A 4mA signal produces a 0
°
F
offset.A 20mA signal produces the maximum allowed offset
(10 or 20
°
F above the Local Setpoint Value). The setpoint is
changed linearly between these extremes as the input varies
over the range of 4-20mA. This input will only be accepted
when "Analog" Remote Mode is selected, the "Remote
Analog Input Range" setpoint is set for "2-10VDC" and
Microboard jumper JP24 has been placed on pins 1 and 2.
Calculate the setpoint for various inputs as follows:
OFFSET (F) = (mA-4)(Remote Temp. Reset Range)
16
SETPOINT (F) = Local Setpoint + Offset
For example, if input is 8mA, and the Remote Reset Temp.
Range Setpoint is programmed for 10
°
F and the Local Leav-
ing Liquid Temperature setpoint is programmed to 40
°
F, the
setpoint could be set to 42.5
°
F as follows:
OFFSET (
°
F) = (8-4)(10)
16
=(4)(10)
16
= 40
16
=2.5
°
F
SETPOINT (
°
F) = 40 + 2.5
= 42.5
°
F

FORM 160.67-PW2 (1007)
11
JOHNSON CONTROLS
FIG. 14 – REMOTE LEAVING CHILLED LIQUID TEMP.
SETPOINT WITH PWM SIGNAL
PWM - The Pulse Width Modulation is in the form of a 1
to 11 second relay contact closure that applies 115VAC to
the I/O Board TB4-19 for 1- 11 seconds. As shown in FIG.
14, connect dry closure relay contacts between I/O Board
TB4-19 (input) and TB4-1 (115VAC). A contact closure
time (Pulse Width) of 1 second produces a 0
°
F offset. An
11 second closure produces the maximum allowed offset
(10 of 20
°
F above the local setpoint value). The relay
contacts should close for 1 to 11 seconds at least every 30
minutes to maintain the setpoint to the desired value. If a
1 to 11 second closure is NOT received within 30 minutes
of the closure, the setpoint is defaulted to the local setpoint
value. A closure is only accepted at rates NOT to exceed
once every 70 Seconds. This input will only be accepted in
"Digital" Remote Mode. Calculate the setpoint for various
pulse widths as follows:
OFFSET (°F) =
(Pulse Width)(Remote Reset Temp. Range)
10
SETPOINT (
°
F) = LOCAL SETPOINT + OFFSET
For example, if the relay contacts close for 5 seconds and the
Remote Reset Temperature Range setpoint is programmed
for 10
°
F, and the Local Leaving Chilled Liquid Temperature
setpoint is programmed for 40
°
F, the setpoint would be set
to 44
°
F as follows:
OFFSET (
°
F) = (5-1)(10)
10
= (4)(10)
10
= 40
10
=4
°
F
SETPOINT (
°
F) = 40 + 4
= 44
°
F
LD06834
FIG. 15 – EXTERNAL SIGNAL FOR REFRIGERATION
UNIT FAILURE
EXTERNAL SIGNAL FOR REFRIGERATION
UNIT FAILURE - When the Safety Shutdown Contacts
(FIG. 3) are NOT connected to an Energy Management
System they may be employed to energize a local or remote
safety alarm (by others). When the normally open Safety
Shutdown Contacts close, the alarm will indicate shutdown
of the unit.
The OptiView
™
Control Center Operation Manual provides
a list and explanation of all safety shutdowns that will close
the contacts.
When all safety controls are satisfied, and the OptiView
™
Control Center COMPRESSOR switch has been manually
"Reset" (de-energizing alarm) and returned to the RUN posi-
tion (l), the unit may be restarted, if the panel is in "Remote"
mode, and the Remote Start contacts are closed (FIG. 6); or,
if the panel is in "Local" mode by momentarily pressing the
keypad compressor switch to the START (◄) position.
If the unit was shutdown because of
Cycling Shutdown Contacts (see FIG. 2)
the alarm will NOT be energized, but the
unit will have been shutdown. A closure
of the safety alarm contacts means that
an operator must manually reset the
safety after the condition has returned to
normal.
When the Safety Shutdown Contacts close, the OptiView™
Control Center will display the following message: "SAFE-
TY SHUTDOWN - MANUAL RESTART", and cause of
shutdown.
LD13177

JOHNSON CONTROLS
12
FORM 160.67-PW2 (1007)
LD04399
FIG. 16 – AUXILIARY SAFETY SHUTDOWN INPUT
AUXILIARY SAFETY SHUTDOWN - The closure of a
Momentary or Maintained N.O. Switch or Relay Contacts
will cause the unit to shutdown and display: "SAFETY
SHUTDOWN - MANUAL RESTART" and "AUXILIARY
SAFETY - CONTACTS CLOSED". The unit may NOT be
restarted until the contacts open and the keypad COMPRES-
SOR switch is moved to the "STOP-RESET" position (O)
and then to the "START" (◄) position.
J7-
MICROBOARD
THERMAL-TYPE FLOW SENSOR
12
1
TB4
I/O BOARD
PADDLE-TYPE FLOW SENSOR
OR DIFERENTIAL PRESSURE SWITCH
EVAPORATOR
LIQUID
LD13187
FIG. 17 – EVAPORATOR FLOW SENSORS
EVAPORATOR FLOW SENSORS - The chiller is sup-
plied with a thermal conductivity type flow sensor factory
installed in the evaporator liquid outlet nozzle.
The Thermal-type flow sensor interfaces with the Microboard.
The Paddle-type flow sensor of Differential Pressure Switch
interfaces with the I/O board.
For the program to read the appropriate inputs for the flow
sensor status, the actual flow sensor type used must be en-
THERMAL-TYPE FLOW SENSORS - When the
Thermal-type flow switch is used, the flow switch uses the
cooling effect of liquid to sense flow.
When the flow of liquid is sensed, the relay output is turned
ON conducting current through the microboard load resistor
to the +5VDC applying >+4VDC to the microboard input
J7-14.
When NO flow of liquid is sensed, the relay output is turned
OFF, this results in <1VDC to the microboard input and a
unit shutdown after a 5 second delay.
LD04400
FIG. 17A – PADDLE-TYPE FLOW SENSOR
PADDLE-TYPE FLOW SENSOR - If desired, a paddle-
type flow sensor can be applied. Flow Switch - Johnson
Controls type F61MG-1C, max. 150 psi (YORK P/N 024-
26116-000) is available at an additional cost.
tered at the keypad using the Service Access Level. Enter
"Analog" for Thermal-type or "Digital" for Paddle-type or
Differential Pressure Switch. Refer to the Operation Manual
160.67 O1.
With any type of Flow Switch Sensor, when the Evaporator
Liquid is flowing, the flow switch contacts will close. If
the flow switch opens for 5 seconds, the unit shuts down
and displays " CYCLING SHUTDOWN" and "LEAVING
CHILLED LIQUID - FLOW SWITCH OPEN". The chiller
may be restarted when the switch again closes. The flow
switch status is checked 10 seconds (programmable up to
60 seconds) after the turbine slow roll has been completed
and the chilled liquid pump contacts have been closed, and
continuously thereafter.

FORM 160.67-PW2 (1007)
13
JOHNSON CONTROLS
LD13178
FIG. 17B – EVAPORATOR LIQUID PRESSURE
DIFFERENTIAL SWITCH
EVAPORATOR LIQUID PRESSURE DIFFERENTIAL
SWITCH - If desired, an evaporator Liquid Pressure Dif-
ferential Switch can be applied; - Pretempco DPS300A or
Potter 1382, max. 300 psi (YORK P/N 025-30919-000) is
available at an additional cost.
RED
BLK
LD13179
FIG. 18 – TACHOMETER
TACHOMETER - If desired, a tachometer can be used
for remote indication of the turbine speed; Dynalco LMD-
120A (YORK P/N 025-40250-000) is available at an ad-
ditional cost as part of the optional Turbine Gaugeboard.
The tachometer receives a 4-20mA signal from the Analog
I/O board, analog output channel #4 representing a speed
of 0-5000 rpm.
NOTE:
Remove existing wire #325 from the
Analog I/O Expansion Board P7B-4
and connect to TB7-313.
CABLE 31
(#18/2 Shielded Cable)
CABLE 31
(#18/2 Shielded Cable)
LD13180
FIG. 19 – CHILLED LIQUID FLOW TRANSMITTER
CHILLED LIQUID FLOW TRANSMITTER - If desired,
a flow transmitter may be connected to the chiller control
panel to display the rate of chilled liquid flowing through
the evaporator. The flow transmitter (supplied by others)
may be a 2-wire or 4-wire device. If a 4-wire device is used,
a loop powered signal isolator must be supplied by others
and wired as shown.
Depending on the type of flow measuring element and
transmitter used, the 4-20mA input signal may be a non-
linear (square root) signal. This input must be enabled and
the calibrated full scale range and the signal type must
be entered at the keypad using the Service Access Level.
Refer to Configuration Screen 2 in the Operation Manual
160.67-O1.
Do NOT apply voltage on field instrument
wiring terminal block TB7. Instrument
loop power is supplied from terminals
313 or 325.

JOHNSON CONTROLS
14
FORM 160.67-PW2 (1007)
CABLE 32
(#18/2 Shielded Cable)
CABLE 32
(#18/2 Shielded Cable)
NOTE:
Remove wire #327 from the Analog I/O
Expansion Board P9A-1 and connect to
TB7-313.
LD13181
FIG. 20 – CONDENSER LIQUID FLOW TRANSMITTER
CONDENSER LIQUID FLOW TRANSMITTER - If
desired, a flow transmitter may be connected to the chiller
control panel to display the rate of cooling water flowing
through the condenser.
The flow transmitter (supplied by others) may be a 2-wire
or 4-wire device. If a 4-wire device is used, a loop powered
signal isolator must be supplied by others and wired as
shown.
Depending on the type of flow metering element and trans-
mitter used, the 4-20mA input signal may be a non linear
(square root) signal. This input must be enabled and the
calibrated full scale range and the signal type must be entered
at the keypad using the Service Access Level. Refer to Con-
figuration Screen 2 in the Operation Manual 160.67-O1.
Do NOT apply voltage on field instru-
ments wiring terminal block TB7. In-
strument loop power is supplied from
terminals 313 or 327.
CABLE 33
(#18/2 Shielded Cable)
CABLE 33
(#18/2 Shielded Cable)
LD13182
FIG. 21 – STEAM FLOW TRANSMITTER
STEAM FLOW TRANSMITTER - If desired, a flow
transmitter may be connected to the chiller control panel to
display the rate of steam flowing through the turbine.
The flow transmitter (supplied by others) may be a 2-wire
or 4-wire device. If a 4-wire device is used, a loop powered
signal isolator must be supplied by others and wired as
shown.
Depending on the type of flow measuring element and
tranmitter used, the 4-20mA input signal may be non linear
(square root) signal. This input must be enabled and the
calibrated full scale range and the signal type must be entered
at the keypad using the Service Access Level. Refer to Con-
figuration Screen 2 in the Operation Manual 160.67-O1.
Do NOT apply voltage on field instru-
ments wiring terminal block TB7. In-
strument loop power is supplied from
terminals 313 or 329.

FORM 160.67-PW2 (1007)
15
JOHNSON CONTROLS
LD09465
FIG. 22 – TURBINE CONDENSATE DRAIN TANK
HIGH LEVEL SWITCH
TURBINE CONDENSATE DRAIN TANK HIGH
LEVEL SWITCH - In some applications, a condensate
drain tank is used to automatically collect and drain any
water that accumulates in the turbine casing. If the tank is
provided with a high level float switch, it may be connected
to the chiller control panel to provide a warning in the event
that the tank draining controls malfunction. The contact
opens on high level to activate the warning.
1. This drawing shows recommended field control
wiring modifications (by others) to the standard
OptiView™Control Center Wiring Diagram 160.67-
PW6.
2. If more than one of these modifications is to be uti-
lized with a particular unit, additional consideration
must be given to the application to insure proper
functioning of the control system. Consult your
YORK representative.
3. The additional controls and wiring for these modifi-
cations are to be furnished and installed in the field
(by others). See WARNING on page 2.
4. The controls specified are recommended for use,
but other controls of equal specifications are ac-
ceptable.
5. All wiring shall be in accordance with the National
Electrical Code, and applicable State and Local
Codes.
6. Each 115VAC field connected inductive load, i.e.
relay coil, motor starter coil, etc., shall have a tran-
sient suppressor wired (by others) in parallel with it's
coil, physically located at the coil. Spare transient
suppressors are furnished in a bag in the OptiView™
Control Center.
NOTES
7. Maximum alllowable current draw between circuits
45 , 151 , and 2 for each installed device is 2 amp
holding and 10 amps inrush - see OptiView™ Control
Center Wiring Diagram in Note 1.
8. For required field wiring connections of the chilled
and condenser liquid pump contacts (terminals 45
and 151 on OptiView™ Control Center field wiring
terminal block TB2) and chilled and condenser wa-
ter flow switches ( terminals 1 , 11 , and 12 on the
OptiView™ Control Center field wiring terminal board
TB2), see Field Wiring diagram 160.67-PW4 and
160.67-PW5.
The chilled and condenser liquid flow switches are
safety controls. They must be connected to pre-
vent operation of the chiller whenever liquid flow
is stopped. The use of the liquid flow switches for
purposes other than protection of the chiller may be
accomplished by installing 2 flow switches, installing
a flowswitch and a relay, or installing a flow switch
with double pole, double throw contacts.
9. Do NOT apply voltage on field wiring terminal blocks
TB4, TB6, and TB7 in YORK OptiView™ Control
Center. All control and instrument power sources
are received from the Control Center.

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P.O. Box 1592, York, Pennsylvania USA 17405-1592 Subject to change without notice. Printed in USA
Copyright © by Johnson Controls 2007 ALL RIGHTS RESERVED
Form 160.73-PW2 (1007)
Supersedes: 160.73-PW2 (204)