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System Control Circuit Wiring
Water Pump Interlock Circuits
and Flow Switch Input
Chilled Water Pump. Wire the
evaporator water pump contactor
(5K1) to a separate 120 volt single
phase power supply with 14 AWG,
600 volt copper wire, then connect
this circuit to 1A5-J2-6. Then use
1A5-J2-4 120 VAC output to allow the
UCP to control the evaporator water
pump, or wire the 5K1 contactor to
operate remotely and independently
of the UCP . (Left panel only.)
Chilled Water Proof of Flow
Wire the auxiliary contacts of the
evaporator water pump contactor
(5K1) in series with the flow switch
(5S1) installed in the evaporator
supply pipe. Use 14 AWG, 600-volt
copper wire.
Connect this circuit to UCP terminals
lX1-5 to 1A6-J3-2. (Left panel only.)
When installed properly, the chilled
water interlock circuit will only allow
compressor operation if the
evaporator pump is running and
providing at least the minimum
water flow required.
56
Electrical
Information
Condenser Water Pump. Wire the
condenser water pump contactor
(5K2) to a separate 120-volt, single-
phase power supply with 14 AWG,
600-volt copper wire; then connect
this circuit to UCP terminals 1A5-J2-
3. Then use 1A5-J2-1 120 VAC output
to allow UCP to control the
condenser pump. (Left panel only.)
Condenser Water Proof of Flow
Next, use 14 AWG, 600-volt copper
wire to connect the auxiliary contacts
of the condenser water pump
contactor (5K2) in series with the
flow switch (5S2) installed in the
condenser supply pipe.
Connect this circuit to UCP terminals
1X1-6 to 1A6-J2-2. (Left panel only.)
When installed properly, the
condenser water lock circuit will only
allow the compressor to operate if
the condenser pump is running and
providing at least the minimum
water flow required.
System Control
Wiring
Temperature Sensor Circuits
All temperature sensors are factory-
installed except the optional outdoor
air temperature sensor. This sensor
is required for the outdoor air
temperature type of chilled water
reset. Follow the guidelines below to
locate and mount the outdoor air
temperature sensor. Mount the
sensor probe where needed,
however, mount the sensor module
in the UCP .
The outdoor temperature sensor
similar to the unit mounted
temperature sensors in that it
consists of the sensor probe and the
module. A four-wire IPC bus is
connected to the module for 24 vdc
power and the communications link.
We recommend mounting the
sensor module within the UCP and
the sensor two wire leads be
extended and routed to the outdoor
temperature sensor probe sensing
location. This assures the four wire
IPC bus protection and provides
access to the module for
configuration at start-up.
CDHF-SVN01B-EN
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