Honeywell YCT51N Owner's Manual

Honeywell Thermostats Owner's Manual - YCT51N.
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Owner’s Manual 

English: Page 1
Mode d’emploi 

Français : Page 6
Manual de Uso 

Español: Página 11

CT50 Series
Thermostat

® U.S. Registered Trademark. Patents pending. 

Copyright © 2009 Honeywell International Inc.

All rights reserved.

M23785 

69-2040EFS-01

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);selectmodels;forgaragesorotheroutbuildings.

Is there a sealed tube containing mercury? 

If so, see mercury notice below.

Leave wallplate in place.

Old thermostat

Cover

Check package contents:

Thermostat

Wallanchors&screws(2each)

Wirelabels

Before you begin, make sure you have:

No.2Phillips&smallpocketscrewdrivers

Hammer

Level(optional)

Pencil

Drillandbit(3/16”fordrywall,7/32”for

plaster)

Getting started

Remove your old thermostat

Vertical Mount: 

CT50(24Vacheatingsystems) 

CT51(24Vacheatingandcoolingsystems) 

CT53(750mVor12Vdcheatingsystems)

Horizontal Mount: 

CT54(24Vacheatingsystems) 

CT55(24Vacheatingandcoolingsystems)

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