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Page 9
CONTINUOUS FAN OPERATION
A call for Fan from any zone will initiate the G
equipment output terminal. The normally open (NO)
damper terminal at all zones not calling for continuous
fan will be energized.
DAMPER OPERATION
The “NO” output will be energized and the “NC” output
will be de-energized for any zone not calling for heating
or cooling while the equipment output is energized and
during the damper purge time delay. During equipment
operation or during the damper purge time delay,
should all zones stop calling for heating or cooling, the
damper terminals will remain in the position they were
in before all zones stopped calling.
Damper Purge Time Delay
When the Purge/No Purge jumper is at No Purge,
the damper purge time delay is 3.5 minutes and
begins when the equipment output(s) turn off. NO
PURGE is the preferred method of purge control for
Lennox furnaces and air conditioners. When the
jumper is at Purge, the damper purge time delay is
one (1) minute.
Sequence of Operation (continued)