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E E l l e e c c t t r r i i c c a a l l R R e e q q u u i i r r e e m m e e n n t t s s
Table 13. Unit control panel wiring 120 Vac
Standard Control Circuits: Unit
Control Panel Control Wiring
(120 Vac)
Evaporator Water Flow Switch
Condenser Water Flow Switch
Evaporator Water Pump Control
Condenser Water Pump Control
Optional Control Circuits (120
Vac)
Maximum Capacity Relay Output
Head Relief Request Relay Output
Ice Building Indicator
Standard Low Voltage Circuits
(Less than 30 Vac)
(a)
External Auto Stop Input
Emergency Stop Input
Optional Low Voltage Circuits
External Base Loading Enable Input
External Hot Water Control Enable
Input
External Ice Machine Control
Enable Input
Condenser Refrigerant Pressure
Chiller % Capacity Output
Evaporator/Condenser Differential
Pressure Output
External Current Limit Setpoint
Input
External Chilled Water Setpoint
Input
External Base Loading Setpoint
Input
Generic Refrigerant Monitor Input
Outdoor Air Temperature Sensor
Trace Comm Interface or LonTalk
BACnet or MODBUS
Tracer SC Module
Note: All wiring to be in accordance with National Electrical Code (NEC) and any local codes.
(a)
Standard low-voltage circuits (less than 30 Vac) must be separated from 120 Vac or higher wiring.
Sensor Circuits
All sensors are factory-installed except the optional
outdoor air temperature sensor (refer to the following
figure for sensor locations). This sensor is required for
the outdoor air temperature type of chilled water reset.
38
Unit Control Terminations
1K11-J3-1 to 2
1K11-J2-1 to 2
1K12-J2-4 to 6
1K12-J2-1 to 3
Note: Defaults are factory programmed; alternates can be selected at start-up using the service tool.
1K14-J2-4
J11-J2-4 to 6
1K15-J2-1 to 3
Unit Control Panel Terminations
1K4-J2-1 to 2
1K4-J2-3 to 4
1k8-J2-2 to 3
1k9-J2-3 to 4
1K3-J2-1 to 2
1K7-J2-4 to 6
1K7-J2-1 to 3
1K7-J2-4 to 6
1K6-J2-2 to 3
1K6-J2-5 to 6
1K8-J2-2 to 3
1K8-J2-5 to 6
Inter-processor Communication
(IPC) Bus Connection and Sensor—
4BT9
1K5-J2-1(+) to 2(-)
1K5-J2-3(+) to 4(-)
1K20 5(+) to 6(-)
1K21
Input or Output Type
Binary Input
Binary Input
Binary Output
Binary Output
Binary Output
Binary Output
Binary Output
Input or Output Type
Binary Input
Binary Input
Binary Input
Binary Input
Binary Input
Analog Output
Analog Output
Analog Output
Analog Input
Analog Input
Analog Input
Analog Input
Communication and Sensor
Communication to Tracer
or LonTalk
Communication to BACnet or
MODBUS
Communication to Tracer SC
Module
Use the following guidelines to locate and mount the
outdoor air temperature sensor. Mount the sensor
probe where needed; however, mount the sensor
module in the control panel.
Contacts
Normally Open, Closure with Flow
Normally Open, Closure with Flow
Normally Open
Normally Open
Normally Open
Normally Open
Normally Open
Contacts
Closure Required for Normal
Operation
Closure Required for Normal
Operation
Normally Open
Normally Open
Normally Open
2–10 Vdc
2–10 Vdc
2–10 Vdc
2–10 Vdc, or 4–20 mA
2–10 Vdc, or 4–20 mA
2–10 Vdc, or 4–20 mA
2–10 Vdc, or 4–20 mA
(As Ordered; See Sales Order)
(As Ordered; See Sales Order)
HDWA-SVX001D-EN
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