Rheem RGFG User Manual

Typical Wiring Accessories for Communicating Residential Systems
The Rheem Serial Communicating (CC2) system allows accessories to be connected to shut down the
system in the event of a fault. Typical devices that can be connected are the drain overflow switch,
smoke detector and freeze protection switch. There are two methods of connecting the switch to the
system depending on the device configuration normally closed or normally open. The blower can run
during a fault or the blower can shut off during a fault depending on how the system is connected.
Please refer to local and/or state codes for installing these devices. The following operation applies only
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
CONTACTS WIRING CONFIGURATION
NORMALLY
OPEN
When 24 VAC is applied to Y1 at the furnace control in a
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.
A
BLOWER
RUNS
(Y1)
NORMALLY
CLOSED
If the device does not have normally open contacts an
additional relay must be used for proper system operation.
NORMALLY
OPEN
When the device is connected to Y2 and a fault occurs the
blower will shut down. The Y2 input can still be used with
normally open or normally closed contacts.
B
BLOWER
DOES NOT
RUN
(Y2)
NORMALLY
CLOSED
If the device does not have normally open contacts an
additional relay must be used for proper system operation.
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Rheem RGFG Specifications

General

Brand	Rheem
Model	RGFG
Category	Furnace
Language	English