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System Control Circuit Wiring (Field Wiring)
Chilled Water Pump
1. Wire the evaporator water pump contactor (5K42) to a
separate 120 volt single-phase power supply with
14 AWG, 600V copper wire. For AWG/MCM
2
equivalents in mm
, refer to the table in
Requirements," p.
53.
2. Connect circuit to 1K15-J2-6.
3. Use 1K15-J2-4 120 Vac output to allow the control
panel to control the evaporator water pump, or wire the
5K1 contactor to operate remotely and independently
of the control panel (left panel only).
Chilled Water Proof of Flow
When this circuit is installed properly and the evaporator
pump is running and providing the required minimum flow,
this circuit will prove the evaporator water flow for the
chiller controls. Proof of evaporator water flow is required
before the start sequence will be allowed to proceed and a
loss of evaporator water flow during chiller operation will
result in a chiller shutdown.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input; normally-
open, closure for flow. Apply no external power.
1. With factory-installed ifm efector
devices, a field-provided secondary flow-sensing
device is recommended with applications having 38°F
(3.3°C) and below leaving evaporator water
temperatures. When a secondary flow-sensing device
is used, remove the factory jumper and install its
contacts between 1X1-5 to 1K26-4; this places the
secondary flow sensing device in series with the ifm
®
efector
flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-5 to 1K16-J3-2 (left panel only). A
secondary field device is recommended with
applications having 38°F (3.3°C) and below leaving
evaporator water temperatures, and must be field-wired
in series with the primary proof of flow device.
Condenser Water Pump
1. Wire the condenser water pump contactor (5K43) to a
72
"Electrical
®
flow-sensing
separate 120-volt, single-phase power supply with
14 AWG, 600-volt copper wire. For AWG/MCM
2
equivalents in mm
, refer to the table in
Requirements," p.
53.
2. Connect circuit to control panel terminals 1K15-J2-3.
3. Use 1K15-J2-1 120 Vac output to allow the control
panel to control the condenser pump (left panel only).
Condenser Water Proof of Flow
When this circuit is installed properly and the condenser
pump is running and providing the required minimum
condenser water flow, this circuit will prove the condenser
water flow for the chiller controls. Proof of condenser water
flow is also required for the start sequence will be allowed
to proceed and a loss of condenser water flow during chiller
operation will result in a chiller shutdown.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input; normally-
open, closure for flow. Apply no external power.
1. With factory-installed ifm efector
devices, a secondary field-provided flow-sensing
device is optional. When a secondary flow-sensing
device is used, remove the factory jumper, and install
its contacts between 1X1-5 to 1K27-4; this places the
secondary flow sensing device in series with the ifm
®
efector
flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-6 to 1K16-J2-2 (left panel only). The
secondary field provided flow sensing device is
optional; however, when it is present, it must be field-
wired in series with the primary proof of flow device.
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. 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.
"Electrical
®
flow-sensing
CDHH-SVX003C-EN
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