Stage Delay And Differential Settings - Lennox L7742U Programming And Application Manual

Stage Delay & Differential Settings (installer settings)
Press OPTIONS tab, then use the scroll arrows to select INSTALLER
SETTINGS. Press ENTER.
INSTALLER SETTINGS
−−−−−−−−−−−−−−−−−−−−
The following stage delay and differential settings are available for mod-
ifying. Follow the instructions for each parameter.
STAGE DELAY AND DIFFERENTIAL SETTINGS The differential or
delay settings in the Installer Settings menu are:
STG DELAY TIMERS
STG 1 DIFF
(all models)
STG 2 DIFF
(2 stage models)
STG 2 DELAY
(not on single stage models OR if timers turned off)
STG 3 DIFF
(2−stage heat pumps w/backup heat)
STG 3 DELAY
(not on single stage models OR if timers turned off)
STG 4 DIFF
(2−stage heat pumps w 2−stages backup heat)
STG 4 DELAY
(not on single stage models OR if timers turned off)
H/C STGS LOCKED IN
STG 2 HP LOCK TEMP
STG DELAY TIMERS default ON. When ON, all stage delay timers
(stages 2, 3, and 4) are enabled and will serve to bring on additional
stage(s) of cooling or heating on a timed basis (default 20 minutes) in
cases when the previous stage of heating or cooling will not raise or
lower the room temperature to the set point in a given time.
When OFF is selected all stage delay timers are disabled. This means
stages are changed based on the temperature and not their timer de-
lays. Scroll to STG DELAY TIMERS; press ENTER.
STG DELAY TIMERS
DEFAULT (ON) OFF
(not on single stage models)
DIFFERENTIAL SETTINGS The differentials below and shown in
the figures 7 through 14 are defaults and are adjustable for different sys-
tem setups.
STG 1 DIFF Stage 1 differential is used in all thermostats. The default
is 1.0°F but can be programmed between 0.5° and 8.0°F in 0.5°F incre-
ments.
Scroll to STG 1 DIFF; press ENTER. Select the desired differential.
Press SAVE.
STG 1 DIFF
DEFAULT(1.O°F)
STG 2 DIFF thru STG 4 DIFF (multistage models only). The default is
1.0°F but can be programmed between 0.5° and 8.0°F in 0.5°F incre-
ments.
Scroll to STG 2 DIFF (or 3 or 4); press ENTER. Select the desired differ-
ential. Press SAVE.
STG 2 DIFF
DEFAULT(1.O°F)
2nd thru 4th STAGE DELAY timer (multistage models only). If STG
DELAY TIMERS is turned ON, the default delay is 20 minutes but can
be programmed from 5 to 120 minutes in 5−minute increments. If first
stage fails to advance the ambient temperature toward the setpoint by
1.0°F in the programmed delay time, then the second stage is activated.
Scroll to STG 2 DELAY (or 3 or 4); press ENTER. Select the desired
delay. Press SAVE.
STG 2 DELAY
DEFAULT(2OMIN)
ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat
Page 23
O.5°F
O.5°F
5MIN