Lennox L7742U Programming And Application Manual page 26

Stage Delay & Differential Settings (installer settings)
H/C
Stages
Locked =
NO
4th stage
ON
H/C
Stages
Locked =
YES
4th stage
ON
SET-
POINTS: SP −3.5
Figure 10. Heating − Heat Pump w/electric − 4 stage (2 compressor / 2 backup)
H/C
Stages
Locked =
NO or
YES
SET-
POINTS:
Figure 11. Heating − dual fuel − 2 stage (1 compressor / 1 backup)
506061−01 06/08
3rd stage
ON
Stg3 Differential
Stg4 Differential
3rd stage
ON
Stg3 Differential
Stg4 Differential
SP −3.0 SP −2.5 SP −2.0
2nd stage
ON
SP −3.0 SP −2.5 SP −2.0
(continued)
1st stage
ON
2nd stage
ON
Stg2 Differential
3rd stage
OFF
4th stage
OFF
1st stage
ON
2nd stage
ON
Stg2 Differential
SP −1.5 SP −1.0
1st stage
ON
Stg2 Differential
SP −1.5 SP −1.0 SP −0.5
Page 26
Stg1 Differential
2nd stage
OFF
Stg1 Differential
SP −0.5 SP SP +0.5
1st stage
OFF
Stg1 Differential
2nd stage
OFF
SP
SP +0.5
1st stage
OFF
1st stage
OFF
2nd stage
OFF
3rd stage
OFF
4th stage
OFF