Lennox CS7500 Installation And Setup Manual page 22

H/C
Stages
Locked =
NO
3rd stage
4th stage
ON
Stg4 Differential
H/C
Stages
Locked =
YES
3rd stage
4th stage
Stg4 Diff.
ON
POINTS:
SP -3.5 SP -3.0
Figure 15. Heating - Dual Fuel - 4 Stage (2 Compressor / 2 Backup)
2nd stage
ON
ON
Stg3 Differential
2nd stage
ON
ON
Stg3 Differential
SP -2.5 SP -2.0
1st stage
ON
Stg2 Differential
1st stage
ON
Stg2 Differential
SP -1.5 SP -1.0 SP -0.5
22
1st stage
OFF
Stg1 Differential
2nd stage
OFF
3rd stage
OFF
4th stage
OFF
1st stage
OFF
Stg1 Differential
2nd stage
OFF
3rd stage
OFF
4th stage
OFF
SP SP +0.5