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CTK04 ComfortNet™ Communicating Thermostat
15
I/O-CHTSTAT03 69-2688—11
Heat pump with outdoor temperature lockouts
Outdoor temperature lockouts are optional. See Installer Setup
options (ISU 3120).
Heat pump only
Heat pump with backup heat as needed *
Backup heat only
Heat pump only
Heat pump or backup heat operates *
Backup heat only
Outdoor temperature
Outdoor temperature
Backup heat lockout
Backup heat lockout
Compressor lockout
Compressor lockout
* 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.
* 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.
Electric - Backup heat allowed to run with heat pump
Fossil Fuel - Backup heat NOT allowed to run with heat pump