Rheem RHAL-FR18PJ User Manual

25
11.0 SEQUENCE OF OPERATION
11.1 COOLING (COOLING ONLY OR HEAT PUMP)
• When the thermostat “calls for cooling,” the circuit between R and G is completed,
causing the blower relay (BR) to energize. The N.O. contacts will close, causing the
indoor blower motor (IBM) to operate. The circuit between R and Y is also completed:
This circuit closes the contactor (CC) in the outdoor unit starting the compressor
(COMP) and outdoor fan motor (OFM).
11.2 HEATING (ELECTRIC HEAT ONLY)
• When the thermostat “calls for heat,” the circuit between R and W is completed, and
the heater sequencer (HR
1) is energized. The heating elements (HE) and the indoor
blower motor (IBM) will come on. Units with a second heater sequencer (HR
2) can be
connected with the first sequencer (HR
1) to W on the thermostat sub-base or con-
nected to a second stage W
2 on the sub-base.
11.3 HEATING (HEAT PUMP)
• When the thermostat “calls for heat,” the circuits between R and B, R and Y and 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 selector switch is in “heat” posi-
tion). Circuit R and Y energizes the contactor (CC) starting the outdoor fan motor
(OFM) and compressor (COMP). Circuit R and G energizes the blower relay (BR)
starting the indoor blower motor (IBM).
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Rheem RHAL-FR18PJ Specifications

General

Brand	Rheem
Model	RHAL-FR18PJ
Category	Air Handlers
Language	English