Lennox International Inc 51M32 Thermostat Output States, Electric Heat Backup − No Outdoor Sensor

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 −

S X = output is activated with 24VAC

S dc: does not care (output can be in either state, i.e., either active or inactive)

S BBP: outdoor temperature is below balance point

S ABP: outdoor temperature is above balance point

S 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)

S large heat demand: temperature is below (setpoint − 1.5°F), or 30-minute upstage timer has expired (see Nor- mal Heat Mode graph)

S the state of the B terminal is opposite the state of the O terminal.

S data above are tabulated for AUTO fan setting. If fan setting is ON, the fan is activated in all cases.

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