System Control Circuit Wiring
Table 15. Unit control panel wiring 120 Vac
Standard Control Circuits:
Unit Control Panel Control
Wiring (120 Vac)
Unit Control Terminations
Input or Output Type
Contacts
Chilled Water Flow Proving Input
1X1-5 to 1A6-J3-2
Binary Input
Normally Open, closure with flow
Condenser Water Flow Proving
Input
1X1-6 to 1A6-J2-2
Binary Input
Normally Open, closure with flow
Chilled Water Pump Relay Output
1A5-J2- 4 to 6
Binary Output
Normally Open
Condenser Water Pump Relay Out-
put
1A5-J2-1 to 3
Binary Output
Normally Open
Optional Control Circuits
(120 Vac)
Note:
Defaults are factory programmed, alternates can be selected at startup using the service tool.
Alarm Relay MAR (Non-Latching)
Output
1A8-J2-1 to 3
Binary Output
Normally Open
Limit Warning Relay Output
1A8-J2-4 to 6
Binary Output
Normally Open
Alarm Relay MMR (Latching) Out-
put
1A8-J2-7 to 9
Binary Output
Normally Open
Compressor Running Relay Output
1A8-J2-10 to 12
Binary Output
Normally Open
Maximum Capacity Relay Output
1A9-J2-1 to 3
Binary Output
Normally Open
Head Relief Request Relay Output
1A9-J2-4 to 6
Binary Output
Normally Open
Purge Alarm Relay Output
1A9-J2-7 to 9
Binary Output
Normally Open
Ice Making Relay Output
1A5-J2-10 to 12
Binary Output
Normally Open
Free Cooling Relay Output
1A11-J2-4 to 6
Binary Output
Normally Open
Standard Low Voltage Circuits
(less than 30 Vac)
Unit Control Panel
Terminations
Input or Output Type
Contacts
External Auto Stop Input
1A13-J2-1 to 2
Binary Input
Closure required for normal
operation
Emergency Stop Input
1A13-J2-1 to 2
Binary Input
Closure required for normal
operation
Optional Low Voltage Circuits
External Base Loading Enable
Input
1A18-J2-1 to 2
Binary Input
Normally Open
External Hot Water Control Enable
Input
1A18-J2-3 to 4
Binary Input
Normally Open
External Ice Machine Control En-
able Input
1A19-J2-1 to 2
Binary Input
Normally Open
External Free Cooling Input Enable
Input
1A20-J2-1 to 2
Binary Input
Normally Open
% RLA Compressor Output
1A15-J2-1 to 3
Analog Output
2–10 Vdc
External Condenser Pressure Out-
put
1A15-J2-4 to 6
Analog Output
2–10 Vdc
External Current Limit Setpoint
Input
1A16-J2-2 to 3
Analog Input
2–10 Vdc, or 4–20 mA
External Current Limit Setpoint
Input
1A16-J2-5 to 6
Analog Input
2–10 Vdc, or 4–20 mA
External Current Limit Setpoint
Input
1A17-J2-2 to 3
Analog Input
2–10 Vdc, or 4–20 mA
Generic Refrigerant Monitor input
1A17-J2-5 to 6
Analog Input
2–10 Vdc, or 4–20 mA
Outdoor Air Temperature sensor
IPC bus Connection and sensor
Communication and sensor
Tracer™ Comm Interface or
LonTalk®
1A14-J2-1(+) to 2(-)
1A14-J2-3(+) to 4(-)
Communication to Tracer or LonTalk (as ordered, see sales order)
Note: All wiring to be in accordance with National Electrical Codes and any local codes
(a) If the Chilled Water Flow Proving Input is a factory-installed ifm efector flow-sensing device, the secondary field
device (recommended with 3.3°C [38°F] and lower leaving chilled water temperatures) for proof of flow connects from
1X1-5 to 1K26-4 (binary input; normally open, closure with flow). Remove factory jumper when used.
(b)
If the Condenser Water Flow Proving Input is a factory-installed ifm efector flow-sensing device, the secondary
(optional) field device for proof of flow connects from 1X1-6 to 1K27-4 (binary input; normally open, closure with flow).
Remove factory jumper when used.
RELEASED 10/Mar/2020 06:59:20 GMT
