17
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
terminal
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.
Wire
Connector
Interlocking HRV Operation to an Airhandler/Furnace Blower
