Lennox CS7500 Installation And Setup Manual page 16

Equipment Available
Two-stage heat pump with:
• Two-stages of gas or
• Oil backup
• Modulation furnace
Two stages of gas/oil heat or
modulation furnace
Single stage cooling
Two stage cooling
Three stage cooling
Stage Delay Timer
Default ON. When ON, all stage delay timers (stag-
es 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 delays.
Scroll to STG DELAY TIMERS; and touch to select
the applicable stage delay timer. Touch < to return to
previous menu.
When SSR is enabled then SSR
Stg 2 lock out is automatically
enabled.
• Run heat pump (Y1/Y2).
• All backup heat (W1/W2) is enabled
and SSR Stage 2 Lock Out is set
between 20 - 120 minutes before
the wakeup set point.
• Run W1 only; W2 is enabled and
SSR Stage 2 Lock Out is set
between 20 - 120 minutes before
the wake-up set point.
• Run Y1 to wake up set point.
• Run Y1 during recovery and enable
Y2 field wake up set point.
• Run Y1 during recovery and enable
Y2 and Y3 at field wake up set
point.
Stage Delay Differentials
Stage delays and differentials are individual set in
the installer settings screen.
Stage 1 Differential
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 increments. Touch < to
return to previous menu.
Stage 2 Through 4 Differential
(Where applicable) The default is 1.0°F but can be
programmed between 0.5° and 8.0°F in 0.5°F incre-
ments. Touch < to return to previous menu.
16
When SSR is disabled then
SSR Stg 2 lock-out setting is
disabled.
• Run HP (Y1/Y2) until a second-
stage demand is needed which
is determined by the time /
temperature differential.
• Heat pump operation will stop and
changeover and lock-in to W1/W2
heat until set point is reached.
• Run W1 heat and bring on W2 heat
until set point is reached.
• Run Y1 until set point is reached.
• Run Y1 and Y2 as needed until set
point is reached.
• Run Y1, Y2, and Y3 as needed until
set point is reached.