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44
FIGURE 37
CONDENSATE DRAIN TRAP
DO NOT OPERATE UNIT WITHOUT
CONDENSATE DRAIN TRAP.
UNIT
DO NOT OVERTIGHTEN DRAIN FITTING
UNIT MUST BE SLIGHTLY INCLINED
TOWARD DRAIN CONNECTION.
9.0 AIR FILTER (Not Factory-Installed)
If a remote filter is installed, it should be sized for a maximum of 300 feet/min. air veloci-
ty for the CFM required.
IMPORTANT: Do not operate system without a filter. A filter is required to protect the
coil, blower and internal parts from excessive dirt and dust.
10.0 SEQUENCE OF OPERATION
10.1 Cooling (cooling only or heat pump)
• When the thermostat "calls for cooling," the circuit between R, G and Y is completed,
causing the blower to energize. This circuit also closes the contactor (CC) in the out-
door unit starting the compressor (COMP) and outdoor fan motor (OFM).
10.2 Heating (electric heat only)
• When the thermostat "calls for heat," the circuit between R and W
the heater sequencer (HR
elements (HE) and the indoor blower motor (IBM) will come on. Units with a second
heater sequencer (HR
) can be connected with the first sequencer (HR
2
thermostat sub-base or connected to a second stage W
W
on the furnace board MUST be connected for heating blower operation.
1
10.3 Heating (heat pump)
• When the thermostat "calls for heat," the circuits between R and G are completed.
Circuit R and B energizes the reversing valve (RV) switching it to the heating position
(remains energized as long as system switch is in "heat" position). Circuit R and Y
energizes the contactor (CC) starting the outdoor fan motor (OFM), compressor
(COMP), and the indoor blower motor (IBM).
• If the room temperature should continue to fall, circuit R and W
second-stage heat room thermostat. Circuit R-W
The completed circuit will energize supplemental electric heat. Units with a second
heater sequencer (HR
) can be connected with first sequencer (HR
2
stat or connected to a third heating stage W
the thermostat indicates when supplemental heat is being energized.
10.4 DEFROST
• For sequence of operation for defrost controls, see outdoor heat pump installation
instructions.
• Supplemental heat during defrost can be provided by connecting the purple (PU) pig-
tail in the outdoor unit to P on the indoor unit control board. This will complete the cir-
cuit between R and W through a set of contacts in the defrost relay (DR) when the
outdoor heat pump is in defrost. This circuit, if connected, will temper air being dis-
charged from the indoor unit during defrost.
) is energized. A time delay will follow then: The heating
1
energizes a heat sequencer (HR
2
on the thermostat sub-base. A light on
3
3''
3''
is completed, and
1
) to W on the
1
on the sub-base.
2
is completed by the
2
).
1
) to W
on thermo-
1
2
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