Lennox ComfortSense 7500

25
Equipment Available
When SSR is enabled then SSR
Stg 2 lock out is automatically
enabled.
When SSR is disabled then SSR Stg 2
lock-out setting is disabled.
Single-stage heat pump
with:
 Two-stages of gas
or oil backup
 Modulation furnace
 Run heat pump (Y1) only
 All backup heat (W1/W2) is
enabled and SSR Stage 2
Lock Out is set between 20 -
120 minutes before the
wake-up set point.
 Run heat pump (Y1) until a second-
stage heating demand is needed
which is determined by the time /
temperature differential.
 Heat pump operation will stop and
changeover to W1/W2 heat as need
ed
 Lock-in W1/W2 heat until set point is
reached.
Two-stage heat pump
with one stage gas/oil
backup
 Run heat pump (Y1/Y2) only.
 All backup heat (W1/W2) is
enabled and SSR Stage 2
Lock Out is set between 20 -
120 minutes before the
wake-up set point.
 Run heat pump (Y1/Y2) until a
second-stage demand is needed
which is determined by the time /
temperature differential.
 Heat pump operation will stop and
gas or oil heat will start.
 Changeover and lock-in to W1 heat
will occur until set point is reached