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Table 3
Thermostat Output States
Condition W1 Y1 G O E
Electric Heat Backup − No Outdoor Sensor
small heat demand X X
large heat demand X X X
emergency heat demand X X
cool demand X X X
no demand dc
Gas Heat Backup (Dual Fuel) − No Outdoor Sensor
small heat demand X X
large heat demand X
emergency heat demand X
cool demand X X X
no demand dc
Electric Heat Backup − Outdoor Sensor Attached
small heat demand (BBP) X X
large heat demand (BBP) X X X
small heat demand (ABP) X X
large heat demand (ABP) X X
emergency heat demand X X
cool demand X X X
no demand dc
Gas Heat Backup (Dual Fuel) − Outdoor Sensor Attached
small heat demand (BBP) X
large heat demand (BBP) X
small heat demand (ABP) X X
large heat demand (ABP) X
emergency heat demand X
cool demand X X X
no demand dc
NOTE −
X = output is activated with 24VAC
dc: does not care (output can be in either state, i.e., either active or inactive)
BBP: outdoor temperature is below balance point
ABP: outdoor temperature is above balance point
small heat demand: temperature is between (setpoint − 1.5°F) and (setpoint − 0.5°F), and 30-minute upstage
timer has not expired (see Normal Heat Mode graph)
large heat demand: temperature is below (setpoint − 1.5°F), or 30-minute upstage timer has expired (see Nor-
mal Heat Mode graph)
the state of the B terminal is opposite the state of the O terminal.
data above are tabulated for AUTO fan setting. If fan setting is ON, the fan is activated in all cases.
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