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Sequence of Operation (continued)
HEATING OPERATION – HEAT/COOL SYSTEMS
When a zone makes a call for Heat, the W1 and B
output terminals will energize. The G terminal will also
energize if the ELECTRIC/GAS switch is in the
ELECTRIC position. The W1 terminal de-energizes
when (1) all zones stop calling for Heat, (2) the call has
exceeded the heat/cool changeover time limit while a
cooling call exists or (3) the call is interrupted by the
high limit setting. When the W1 terminal is de-
energized, a minimum off time delay of 4 minutes must
elapse before it can be energized again. Should any call
for Heat not be satisfied in the time that is set on the
STAGE dip switch bank, or should the "2S" terminal of
any calling zone be energized, or the number of zones
calling for conditioning matches or exceeds the # Zones
to stage setting, the W2 terminal will energize in
addition to the W1 terminal. For greater detail on how
the system configuration DIP switch positions affect
staging, see the system setup flowchart starting on
page 20. When none of the conditions that initiate the
W2 terminal are present, the W2 terminal will
de-energize. Once de-energized, the W2 terminal has
a 4 minute minimum off time. The B terminal remains
energized until there is a Cool call.
Fan Purge Time Delay
If the ELECTRIC/GAS selector is in the ELECT
position and the PURGE/NO PURGE selector is in
the PURGE position, the G terminal will remain
energized for one minute after the W terminal is de-
energized. The NO PURGE setting is the preferred
purge control setting for Lennox equipment. Lennox
equipment includes controls which sequence the
indoor fan off after a call for heat has been satisfied.
If the ELEC/GAS selector is in the GAS position, the
G terminal does not turn on during purge regardless
of the position of the PURGE or NO PURGE selector.
Lennox furnaces will control the purge though the
furnace control board cool down feature. The cool
down time is often adjustable at the furnace control
board up to 3.5 minutes. NO PURGE is the preferred
method of purge when this zone panel is applied to
Lennox equipment.
HEATING OPERATION – HEAT PUMP SYSTEMS
When a zone makes a call for Heat, the Y1, G and B
output terminals will energize. The Y1 terminal de-
energizes when (1) all zones stop calling for Heat, (2)
the call has exceeded the heat/cool changeover time
limit while a cooling call exists or (3) the call is
interrupted by the high limit setting. When the Y1
terminal is de-energized, a minimum off time delay of 4
minutes must elapse before it can be energized again.
Should any call for Heat not be satisfied in the time that
is set on the STAGE dip switch bank, or should the "2S"
terminal of any calling zone be energized, or should the
number of zones calling for heat match or exceed the #
Zones to Stage setting, the Y2 terminal will energize.
For greater detail on how the system configuration DIP
switches positions affect staging, see the system setup
flowchart starting on page 20. When none of the
conditions that initiate the Y2 terminal are present, the
Y2 terminal will de-energize. Once de-energized, the Y2
terminal can not be energized again until a 4-minute
minimum off time delay elapses. The B terminal remains
energized until there is a Cool call.
AUXILIARY HEAT OPERATION –
HEAT PUMP SYSTEMS
Auxiliary Heat can be controlled by time or by the
thermostats.
Thermostat Control (Heat Pump thermostats in all
zones): If the Y and W thermostat input terminals at
any zone are energized concurrently (assuming the
heat pump is on in the Heat mode of operation), the W1
output terminal will energize immediately. This is
thermostat control.
Time Control (Heat/Cool thermostats in all zones): If
it is desired to have the auxiliary heat come on after a
specific amount of time, set the appropriate AUX
switch(es) to ON. Should any call for Heat exist longer
than the time that is set on the STAGE MINUTES plus
the AUX MINUTES dip switch bank, the W1 equipment
output terminal energizes. (NOTE: When using time
controlled auxiliary heat, DO NOT USE heat pump
thermostats, heat / cool thermostats must be used
when staging the auxiliary heat by time.)
The W1 terminal immediately de-energizes when both
of the above two conditions no longer exist.
Page 18
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