CT51 Series
Thermostat
Getting started
Before you begin, make sure you have:
• No. 2 Phillips & small pocket screwdrivers
• Hammer
• Level (optional)
• Pencil
• Drill and bit (3/16” for drywall, 7/32” for plaster)
® U.S. Registered Trademark. Patents pending.
Copyright © 2006 Honeywell International Inc.
All rights reserved.
Owner’s Manual
English: Page 1
Mode d’emploi
Français: Page 6
Manual de Uso
Español: Página 11
Check package contents:
• Thermostat
• Wall anchors & screws (2 each)
• Wire labels
Remove your old thermostat
TURN OFF POWER at heating/cooling system (or fuse/circuit-breaker panel).
Remove cover and thermostat, but leave wallplate with wires attached.
Old thermostat
Leave wallplate in place Is there a sealed tube containing mercury?
If so, see mercury notice below.
Cover
MERCURY NOTICE: If your old thermostat contains mercury, contact your local waste
management authority for proper disposal instructions.
These models provide control of 24 Vac heating & cooling systems:
Vertical Mount: CT51N • Horizontal Mount: CT55N
