Lennox ComfortSense L7742U Programming Guide

506180−01 09/08
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
Configuration Figure
Multi−stage Cooling for Heat Pump/Non−Heat Pump 7
Heating − Non−Heat Pump (1 or 2 stages) 8
Heating − Heat Pump with NO backup heat 8
Heating − Heat Pump w/electric heat (2−stage:
1compr/1backup)
8
Heating − Heat Pump w/electric heat (3 stage:
2compr/1backup)
9
Heating − Heat Pump w/electric heat (3 stage:
1compr/2backup)
9
Heating − Heat Pump w/electric heat (4 stage:
2compr/2backup)
10
Heating − dual fuel (2−stage: 1compr/1backup) 11
Heating − dual fuel (3 stage: 1compr/2backup) 12
Heating − dual fuel (3 stage: 2compr/1backup) 13
Heating − dual fuel (4 stage: 2compr/2backup) 14
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
SET-
POINTS:
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
SP −1.5 SP −1.0 SP −0.5
SP
SP +1.5SP +1.0SP +0.5 SP +2.0
Stg1 Differential
Stg2 Differential
Stg2 Differential
Stg1 Differential
Figure 7. Cooling − 1 or 2 stages
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
1st stage
ON
2nd stage
ON
1st stage
ON
2nd stage
ON
2nd stage
OFF
1st stage
OFF
1st stage
OFF
2nd stage
OFF
SP −1.5 SP −1.0 SP −0.5
SP
SP +0.5SP −2.0
Stg1 Differential
Stg2 Differential
SP −2.5SP −3.0
Stg1 Differential
Stg2 Differential
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-
POINTS:
3rd stage
ON
1st stage
ON
2nd stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
2nd stage
OFF
3rd stage
OFF
1st stage
OFF
1st stage
OFF
2nd stage
OFF
3rd stage
OFF
SP −1.5 SP −1.0 SP −0.5
SP
SP +0.5SP −2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP −2.5SP −3.0SP −3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential
Figure 9. Heating − Heat Pump w/electric − 3 stage
(2 compressor / 1 backup OR 1 compressor / 2 backup)

Lennox ComfortSense L7742U Specifications

General

Brand	Lennox
Model	ComfortSense L7742U
Category	Thermostat
Language	English