Owner’s Manual
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CT50 Series Thermostat
® U.S. Registered Trademark. Patents pending.
Copyright © 2019 Honeywell International Inc.
All rights reserved.
Read and save these instructions
M23786
MERCURY NOTICE
If your old thermostat contains
mercury, contact your local waste
management authority for proper
disposal instructions.
TURN OFF POWER at heating/cooling system (or fuse/circuit-breaker panel).
Remove cover and thermostat, but leave wallplate with wires attached.
Temperature Control Range
• 45°95°F (7°35°C)
• 35°85°F (2°29°C); select models; for garages or other outbuildings.
Is there a sealed tube containing mercury?
If so, see mercury notice below.
Leave wallplate in place.
Old thermostat
Cover
Check package contents:
• Thermostat
• Wall anchors & screws (2 each)
• Wire labels
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)
Getting started
Remove your old thermostat
Vertical Mount:
CT50 (24 Vac heating systems)
CT51 (24 Vac heating and cooling systems)
CT53 (750 mV or 12Vdc heating systems)
Horizontal Mount:
CT54 (24 Vac heating systems)
CT55 (24 Vac heating and cooling systems)
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