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Table 1. Smooth Set Recovery (SSR) & SSR Stg 2 Lock Out Operation
Equipment Available
When SSR is enabled then SSR
Stage 2 lock out is enabled. Can
be set between 20 and 120
minutes. Default is 20 minutes
When SSR is disabled then SSR Stg 2
lock-out setting is disabled.
Single-stage heat pump
with one or two stages
of electric backup
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) and will have
available backup heat (W1/W2) as
needed.
Two-stage heat pump
with one- or two-stages
of electric 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) and will have
available backup heat (W1/W2) as need
ed.
Single-stage heat pump
with single-stage gas or
oil backup
Run heat pump (Y1) only
All backup heat (W1) is en
abled 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
gas or oil heat will start.
Changeover and lock-in to W1 heat
will occur until set point reached.
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