Rheem RGFG Installation Instructions Manual page 40

when BOTH the condenser and thermostat are serial communicating devices. If the condenser is non-
communicating (traditional, legacy 24VAC controlled) this diagram is not valid.
METHOD BLOWER
ACTIVATION
BLOWER
RUNS
A
(Y1)
BLOWER
DOES NOT
B
RUN
(Y2)
40
CONTACTS
NORMALLY When 24 VAC is applied to Y1 at the furnace control in a
OPEN communicating system a SYSTEM BUSY message appears on
the thermostat. When the SYSTEM BUSY message appears the
outdoor unit will shut down and the indoor unit will continue
to run at first stage cooling airflow.
NORMALLY If the device does not have normally open contacts an
CLOSED additional relay must be used for proper system operation.
NORMALLY When the device is connected to Y2 and a fault occurs the
OPEN blower will shut down. The Y2 input can still be used with
normally open or normally closed contacts.
NORMALLY If the device does not have normally open contacts an
CLOSED additional relay must be used for proper system operation.
WIRING CONFIGURATION