Operation – Honeywell Q539F User Manual
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OPERATION
The Q539 Subbase provides cooling anticipation, wir
ing terminals, mounting base, and system and fan switch
ing for the T87F Thermostat.
The Q539 Subbase mounts directly to the wall using
two mounting screws. The T87F Thermostat mounts to the
Q539 Subbase using three captive screws. Tightening
these screws into the subbase also completes all electrical
connections between the subbase and the thermostat.
The HEAT-OFF-COOL system switch selects either
heating or cooling or turns the system off. The FAN-ON-
AUTO fan switch either sets the fan to turn on automatically
during heating or cooling or allows the fan to run continu
ously.
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