Electrical
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CA Model
8733942456(2016/04)
CA Model
ELECTRICAL
Field wiring must comply with local and national fire,
safety and electrical codes. Power to the unit must be
within the operating voltage range indicated on the unit
chassis nameplate or the performance data sheet.
Properly sized fuses or HACR breakers must be
installed for branch circuit protection. See unit chassis
name plate for maximum size.
Each chassis is supplied with a 2 x 4 junction box for
power connection. Inside this box there are 2 pigtail
leads for power wiring. The field ground is to be
connected to the ground connection on the junction
box. On remote thermostat and master/slave units
there are also 5 position terminal blocks for low voltage
thermostat or slave unit connection. On remote
thermostat units, connect the thermostat wires to the
low voltage terminal block. On master/slave units
connect the thermostat to the “Master ” terminal block
of the lead unit and the “Slave” terminal block to the
“Master ” terminal block of the next unit, daisy chaining
the units together as required. Note that there is no
limit to the number of units that can be connected
together in this manner as each unit provides it’s own
low voltage power supply.
Safety Devices and the UPM Controller
Figure # 3
[1] Board Power Indicator
[2] UPM Status LED Indicator
[3] Water Coil Freeze Protection Temperature Selection
[R30]
[4] Air Coil Freeze Protection Temperature Selection
[5] UPM Board Settings
[6] Water Coil Freeze Connection (Freeze 1)
[7] Air Coil Freeze Connection (Freeze 2)
[8] LCD Unit Display Connection
[9] 24VAC Power Input
[10] Compressor Contact Output
[11] High Pressure Switch Connection
[12] Call for Compressor Y1
[13] Low Pressure Switch Connection
[14] 24VAC Power Common
[15] Condensate Overflow Sensor
[16] Dry Contact/Alarm ALR Contact
[17] UPM Ground Standoff
WARNING:
Use only copper conductors for
field installed electrical wiring. Always make
sure that the power disconnect is open
before performing service on the unit
electrical circuits.
All 208/230 volt (-1 voltage code) units are factory
wired to 230 volts unless ordered otherwise. In 208
voltage applications the transformer wiring may
need to be switched from the 230 volt tap to the 208
volt tap. Cap all unused leads.
If the unit is being connected to a thermostat with a
malfunction light, this connection is made at the unit
malfunction output or relay.
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