Lennox CS7500 Installation And Setup Manual page 15

Equipment Available
Single-stage heat pump with
single-stage gas or oil backup
Single-stage heat pump with:
• Two-stages of gas or oil backup
• Modulation furnace
Two-stage heat pump with one
stage gas/oil backup
When SSR is enabled then SSR
Stage 2 lock out is automatically
enabled.
• Run heat pump (Y1) only
• All backup heat (W1) is enabled
and SSR Stage 2 Lock Out is set
between 20 - 120 minutes before
the wake-up set point.
• 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 wakeup set
point.
• 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 wakeup set
point.
15
When SSR is disabled then
SSR Stg 2 lock-out setting is
disabled.
• 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
gas or oil heat will start.
• Changeover and lock-in to W1
heat will occur until set point
reached.
• 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
needed
• Lock-in W1/W2 heat until set point
is reached.
• 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