Specifications

Field Control Panel Signal Wiring
18 CVHE-SVN03D-EN
UCP Electrical
Specifications
Following is a requirements list for
the UCP in the control panel:
Note that the control panel is
designed to receive input from the
secondary of a power transformer in
the starter panel.
1 Nominal Voltage: 115/110 VAC,
60/50 Hz with operating range of
98 to 127 VAC, inclusive.
2 Maximum VA: 4K VA (40-amp
fuse) for units with the
refrigerant pump.
3 Power input wiring must be at
least 6" (152 mm) from low
voltage, less than 30V wiring.
4 All signal inputs are low-voltage
less than 30V.
5 UCP Storage Range: -40°F to
158°F (-40°C to 70°C) i.e., not
applicable for chiller.
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.
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
1X1-5 to 1A6-J3-2.
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.
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.
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.
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.
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.
CWR - Outdoor Option
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.