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Electrical Connections
General
Be sure the available power is the same voltage and phase
as that shown on the unit serial plate. Line and low voltage
wiring must be done in accordance with local codes or the
National Electric Code, whichever is applicable.
Unit Power Connection
Connect the incoming line voltage wires to L1 and L2 of
the contactor as shown in Figure 13B for single-phase unit.
Consult the unit's serial plate data for correct fuse sizes.
NOTE: A disconnection must be incorporated in the fixed
wiring in accordance with the wiring rules/NEC.
Open lower front access panel. Insert power wires through
knockouts on lower left side of cabinet. Route wires through
left side of control box and connect to contactor and ground
(Figure 13B).
Accessory Relay
A set of "dry" contacts has been provided to control
accessory devices, such as water solenoid valves on open
loop installations, electronic air cleaners, humidifiers, etc.
This relay contact should be used only with 24 volt signals
and not line voltage power. The relay has both normally
open and normally closed contacts and can operate with
either the fan or the compressor. Use DIP switch SW2-4 and
5 to cycle the relay with blower, compressor, or control a
slow opening water valve. The relay contacts are available on
terminals #1 and #3 of P2.
208 Volt Operation
All 208/230 units are factory wired for 230 volt operation.
For 208 volt operation, the red and blue transformer wires
must be switched on terminal strip PB2.
Figure 13A:
Wire access
Figure 13B:
Line Voltage 208-230/60/1
control box
1
L2
PB1
L2
2
L1
DUAL COMPRESSOR PACKAGED HEAT PUMP INSTALLATION GUIDE
Pump Power Wiring
See Figure 14 for electrical connections from control box
to pumps.
FC1/FC2 style flow centers with fixed speed pumps connect
to PB1 in the control box.
Figure 14:
Pump Wiring 208-230/60/1
External
Loop Pump(s)
208-230/60/1
1/2 hp Max
Figure 13C: Control Box with ASB Board
L1
15
1
PB1
2
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