Holdoff Timer; Programmed Recovery; Finish With High Heat Stage And/Or Finish With High Cool Stage - Honeywell Home T10 Product Data

Upstage Timer
The Upstage timer setting is only available when:
• The thermostat is configured for a heat pump with an
aux heat stage (electric of fossil fuel).
• The droop setting is set to a setting other than "Comfort"
(2 °F to 15 °F).
Backup Heat Upstage Timer options are Off, 30 minutes to 16
hours. Default is Off.
The upstage timer allows* the aux heat to run when the
highest heat pump stage has run for longer than the timer
setting during a steady state condition. Steady state means
the thermostat is cycling to maintain setpoint.
Manually raising the setpoint or a scheduled setpoint change
will not trigger the upstage timer. In those conditions the
thermostat will not use backup heat unless a different
condition triggers the thermostat to run the backup heat
(Droop, balance point, or manually switching the thermostat to
em heat mode).
*Droop and upstage timer are designed to restrict the auxiliary
heat for customers who are energy conscious. The aux heat
does not necessarily run after the timer has expired even in a
steady state condition. Once the timer expires in steady state
the thermostat calculates whether or not to run the aux heat
based on the load capacity of the highest heat pump stage.
If the heat pump struggles to maintain setpoint, we would
suggest one of the following steps:
1. Verify the heat pump is operating as expected.
2. Set a balance point. If a balance point is already used
but the heatpump cannot handle the load even when
operating correctly, the installer may need to raise this
setting.
3. For heat pump with electric backup heat, set the droop
to "Comfort", this uses the backup heat more
aggressively.

Holdoff Timer

The Backup Heat Holdoff Timer is available for any system
with 2 heating types, the Backup Heat Differential is set to 2
°F (1.0 °C) or higher, and backup heat upstage timer is set to
30 minutes or more. Unlike the upstage timer, the holdoff timer
can be activated by a temperature set point change (not
limited to steady state). The holdoff timer starts when the
highest stage of the previous equipment type turns on. The
out-of-box setting is "Auto" and the thermostat will hold off the
use of backup heat as long as possible when the set point is
changed. If this is changed to a setting other than Auto, then
the auxiliary heat will be FORCED to turn on after this time is
met.

Programmed Recovery

If the primary heat is making progress as expected, backup
heat will not be used to reach the setpoint of the next program
period. Backup heat is always restricted during a programmed
recovery when the Adaptive Intelligent Recovery feature is
used. See note below.
NOTE: During a programmed recovery (or when the tem-
perature setpoint is changed by the user), the ther-
mostat waits to turn on the backup heat depending
on system performance, load conditions and how
many degrees the temperature setpoint is changed.
Backup heat will be used ONLY when the tempera-
ture is not rising quickly enough to reach the setpoint
in a reasonable time. Upstage timer for heat pump
with aux heat applications is only used in steady
state (cycling to maintain setpoint). The thermostat
will not run the aux heat during a programmed recov-
ery unless one of the following conditions occurs:
1. Droop is set for comfort and thermostat calculates that
the heatpump cannot effectively handle the load
conditions.
2. Droop is set to 2 °F to 15 °F and indoor temperature
drops while the highest stage of heatpump is running.
3. Outdoor temperature drops below the balance point
setting (if used).
4. Thermostat is manually switched to em heat mode.
Finish with High Heat stage and/or
Finish with High Cool stage
These settings allow the installer to keep the high stage of the
equipment running until the desired setpoint is reached. This
setting is recommended for Geothermal Heat Pumps to allow
the loop to rest.
When set to no (default), the thermostat cycles the stages
based on load conditions and the cycle rate setting for these
stages.
"Finish with High Cool Stage" is ISU 3020 "Finish with High
stage Stage," is ISU 3021. Set to Yes to turn on these
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