Honeywell International Inc. THX9001R01 Manuale Utente

System Installation Guide

69-2688—01 I/O-CHTSTAT03

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

Backup heat 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