Specifications

6 | Electrical SM CS Series Heat Pump
SM CS Series Heat Pump8 733 920 846 (2014/01) Subject to change without prior notice
ELECTRICAL
Refer to electrical component box layout.
(Figure #4)
Properly sized fuses or HACR circuit breakers must
be installed for branch circuit protection. See unit
nameplate for maximum fuse or breaker size.
The unit is provided with a concentric knock-out
for attaching common trade sizes of conduit, route
power supply wiring through this opening. Always
connect the ground lead to the grounding lug
provided in the control box and power leads to the
line side of compressor contactor as indicated on
the wiring diagram (Figures on Pg#32).
Figure # 4
[1] Comfort Alert Module (Option)
[2] Compressor contactor
[3] Capacitor
[4] Auxiliary Relay (DP/DT)
[5] Terminal block (Option)
[6] Unit Protection Module (UPM)
Safety Devices and the UPM Controller
Figure # 5
[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
[7] Air Coil Freeze Connection
[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
[17] UPM Ground Standoff
Field wiring must comply with local and
national electric codes.
Power to the unit must be within the
operating voltage range indicated on
the unit nameplate or on the
performance data sheet.
Operation of unit on improper line
voltage or with excessive phase
imbalance will be hazardous to the unit,
constitutes abuse and may void the
warranty.
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If the unit is being connected to a thermostat
with a malfunction light, this connection is made
at the unit malfunction output or relay. Refer to
Figure #5.
If the thermostat is provided with a malfunction
light powered off of the common (C) side of the
transformer, a jumper between “R” and “COM”
terminal of “ALR” contacts must be made.
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