Tradewins Furniture RNC20 - Manual (Page 18)

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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