Lennox ComfortSense L7742U Programming Manual page 14

Scroll to STG 2 DELAY (or 3 or 4); press ENTER. Select
the desired delay. Press SAVE.
STG 2 DELAY
DEFAULT(2OMIN) 5MIN
H/C STGS LOCKED IN default NO (heat/cool stages
are turned off separately). If changed to YES, heat/cool
stages are turned off together (see figures 7 through 14).
Scroll to H/C STGS LOCKED IN; press ENTER. Use ar-
rows to select between NO or YES. Press SAVE.
H/C STGS LOCKED IN
DEFAULT (NO) YES
STG2 HP LOCK TEMP default OFF (heat pump stage 2
operates normally). Use this setting in dual fuel applica-
tions to lock in the 2nd stage compressor when the outdoor
temperature is at or less than the LOCK TEMP set point.
Scroll to STG2 HP LOCK TEMP; press ENTER. Use ar-
rows to select a LOCK TEMP between −40 and 75ºF. Press
SAVE.
STG2 HP LOCK TEMP
DEFAULT (OFF) 25°F
H/C
Stages
Locked =
NO
H/C
Stages
Locked =
YES
SET-
POINTS:
H/C
Stages
Locked =
NO
H/C
Stages
Locked =
YES
SET-
POINTS:
Figure 8. 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
SET-
SP −3.5
POINTS:
506180−01 09/08
1st stage
OFF
2nd stage
1st stage
OFF
2nd stage
OFF
SP −1.5 SP −1.0 SP −0.5
Figure 7. Cooling − 1 or 2 stages
2nd stage
2nd stage
SP −3.0 SP −2.5 SP −2.0
3rd stage
ON
Stg3 Differential
3rd stage
ON
Stg3 Differential
SP −3.0 SP −2.5 SP −2.0
Figure 9. Heating − Heat Pump w/electric − 3 stage
(2 compressor / 1 backup OR 1 compressor / 2 backup)
Configuration
Multi−stage Cooling for Heat Pump/Non−Heat Pump
Heating − Non−Heat Pump (1 or 2 stages)
Heating − Heat Pump with NO backup heat
Heating − Heat Pump w/electric heat (2−stage:
1compr/1backup)
Heating − Heat Pump w/electric heat (3 stage:
2compr/1backup)
Heating − Heat Pump w/electric heat (3 stage:
1compr/2backup)
Heating − Heat Pump w/electric heat (4 stage:
2compr/2backup)
Heating − dual fuel (2−stage: 1compr/1backup)
Heating − dual fuel (3 stage: 1compr/2backup)
Heating − dual fuel (3 stage: 2compr/1backup)
Heating − dual fuel (4 stage: 2compr/2backup)
1st stage
ON
Stg1 Differential
OFF
Stg2 Differential
1st stage
ON
Stg1 Differential
Stg2 Differential
SP +0.5 SP +1.0
SP
1st stage
ON
ON
Stg2 Differential
1st stage
ON
ON
Stg2 Differential
SP −1.5 SP −1.0 SP −0.5
1st stage
ON
2nd stage
ON
Stg2 Differential
3rd stage
OFF
1st stage
ON
2nd stage
ON
Stg2 Differential
SP −1.5 SP −1.0 SP −0.5
Page 14
2nd stage
ON
2nd stage
ON
SP +1.5 SP +2.0
1st stage
OFF
Stg1 Differential
2nd stage
OFF
1st stage
OFF
Stg1 Differential
2nd stage
OFF
SP
SP +0.5
1st stage
OFF
Stg1 Differential
2nd stage
OFF
1st stage
OFF
Stg1 Differential
2nd stage
OFF
3rd stage
OFF
SP +0.5
SP
Figure
7
8
8
8
9
9
10
11
12
13
14