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When using the Interface relay contacts to initiate blower operation on a fur-
nace, certain thermostats will initiate the outdoor cooling condenser when
R and G are closed.
Use this wiring configuration to prevent the Interface relay contacts from initializing
the condenser unit. This problem can occur at the thermostat because the
Y
termi-
nal is connected to the
G
terminal internal to the stat. When
R
and
G
are closed at
the furnace (by dehumidistat or relay) 24 Volts is sent to
G
at thermostat. 24 Volts is
then sent through
Y
which will initiate outdoor condenser.
Interlocking HRV Operation to an Airhandler/Furnace Blower
