Lennox MERIT 51M32 Operation Manual page 14

Condition
Electric Heat Backup − No Outdoor Sensor
small heat demand
large heat demand
emergency heat demand
cool demand
no demand
Gas Heat Backup (Dual Fuel) − No Outdoor Sensor
small heat demand
large heat demand
emergency heat demand
cool demand
no demand
Electric Heat Backup − Outdoor Sensor Attached
small heat demand (BBP)
large heat demand (BBP)
small heat demand (ABP)
large heat demand (ABP)
emergency heat demand
cool demand
no demand
Gas Heat Backup (Dual Fuel) − Outdoor Sensor Attached
small heat demand (BBP)
large heat demand (BBP)
small heat demand (ABP)
large heat demand (ABP)
emergency heat demand
cool demand
no demand
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.
Table 3
Thermostat Output States
W1 Y1
X
X X
X
X
X
X
X
X X
X
X
X
X
X
X
X
X
Page 8
G O
X
X
X
X X
dc
X
X X
dc
X
X
X
X
X
X X
dc
X
X X
dc
E
X
X
X
X