Heat Pump And Backup Heat Operation; Heat Pump With Outdoor Temperature Lockouts - Honeywell Home THX9321 Prestige 2.0 Manual

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THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
Multistage Control
Multistage Control keeps 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.
Select Yes to turn on this feature. Default is No.
Fig. 200.

HEAT PUMP AND BACKUP HEAT OPERATION

Heat Pump with Outdoor Temperature Lockouts

Outdoor temperature lockouts are optional. See Installer Setup options (ISU 3120).
Backup heat allowed to run with heat pump
Heat pump with backup heat as needed *
* No backup heat unless indoor temperature drops to selected Backup Heat Differential setting, or Backup Heat
Upstage Timer expires. Heat pump stays ON when backup heat turns on.
Backup heat NOT allowed to run with heat pump
* No backup heat unless indoor temperature drops to selected Backup Heat Differential setting, or Backup
Heat Upstage Timer expires. Heat pump turns OFF when backup heat turns on.
68-0311—08
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IAQ WITH EIM
Heat pump only
Backup heat only
Heat pump only
Heat pump or backup heat operates *
Backup heat only
(see table below)
Backup heat lockout
Compressor lockout
(see table below)
Backup heat lockout
Compressor lockout
98
Fig. 201.