Honeywell PRESTIGE THX9321 System Installation Manual page 19

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
Heat pump or backup heat operates *
* 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.
Heat pump and backup heat operation
Backup Heat Type
Electric forced air
Gas or oil forced air
Hot water radiant heat
Hot water fan coil
Other
69-2490_B.indd 19
Heat pump only
Backup heat only
Heat pump only
Backup heat only
Backup Heat Operation
Allowed to run with heat pump
NOT allowed to run with heat pump
Allowed to run with heat pump
Selectable in installer setup
Selectable in installer setup
19
THX9321/9421 Prestige
(see table below)
Backup heat lockout
Compressor lockout
(see table below)
Backup heat lockout
Compressor lockout
Backup Heat Fan Operation
Thermostat controls fan
Equipment controls fan
[n/a]
Thermostat controls fan
Selectable in installer setup
IAQ and RF EIM
®
69-2490—03
7/13/2011 1:42:00 PM