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Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual
The electrical installation must comply with
the latest edition of: in the U.S. — National
Electrical Code ANSI/NFPA No. 70; in
Canada — CSA C22.1 Canadian Electrical
Code Part 1. Wiring must be N.E.C. Class 1.
Use only copper wire, rated for 120°F and
sized for the load listed in this manual.
Electrical shock hazard — Disconnect
all electrical power before servicing the
unit. Also, the unit must be grounded in
accordance with the Electrical Code listed
above.
Overcurrent protection & wire
sizing
• Protect each circuit with a breaker or fuse rated for
the load given in Figure 1.
The electrical loads given in Figure 1,
page 3 allow for a pump load of no more
than 5 amps at 110 VAC (2.5 amps at
230 VAC). If the pump load exceeds this,
provide a separate power source to the
pump. DO NOT feed power to the pump
from the SpacePak air handler panel.
• Provide a separate power source and overcurrent
protection for the immersion heater. Refer to the
Figures 18 and 19 of this manual for detailed wiring.
SpacePak heat pump wiring
The SpacePak SCM heat pumps require
a dry contact (relay) signal to enable
and select between heating and cooling
modes. They will not operate on the 24V
signals from typical thermostats or air
handlers. Connecting 24V to either of
these points will result in erratic operation
and may cause signicant component
damage.
• Connect single air handler to heat pump as shown
in Figure 16.
• Connect multiple air handlers to heat pump via
SpacePak heat pump Interface Module as shown
in Figure 17.
• See Figure 19, for heat pump electrical ladder dia-
gram.
Section 9: Electrical Connections
Figure 16 SpacePak Heat Pump eld wiring — SINGLE air handler
(See Figure 19 for ladder wiring diagram)
(SCC-1)
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