Lennox CS7500 Installation And Setup Manual page 19

H/C
Stages
Locked =
NO
H/C
Stages
Locked =
YES
POINTS: SP -3.0
Figure 9. Heating - Non-Heat Pump or Heat Pump w/o Backup Heat - 1 or 2 Stages
H/C
Stages
Locked =
NO
H/C
Stages
Locked =
YES
SP -3.5 SP -3.0
POINTS:
(2 Compressor / 1 backup OR 1 Compressor / 2 Backup)
2nd stage
2nd stage
SP -2.5 SP -2.0
2nd stage
3rd stage
ON
Stg3 Differential
2nd stage
3rd stage
ON
Stg3 Differential
SP -2.5 SP -2.0
Figure 10. Heating - Heat Pump w/Electric - 3 Stage
1st stage
ON
Stg2 Differential
1st stage
ON
Stg2 Differential
SP -1.5 SP -1.0
1st stage
ON
Stg2 Differential
3rd stage
OFF
1st stage
ON
Stg2 Differential
SP -1.5 SP -1.0
19
ON
Stg1 Differential
2nd stage
OFF
ON
Stg1 Differential
SP
SP -0.5
ON
Stg1 Differential
2nd stage
OFF
ON
Stg1 Differential
SP -0.5
SP
1st stage
OFF
1st stage
OFF
2nd stage
OFF
SP +0.5
1st stage
OFF
1st stage
OFF
2nd stage
OFF
3rd stage
OFF
SP +0.5