Honeywell CT41A User Manual

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Copyright © 2003 Honeywell International Inc •   

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69-0788-2

Heating/Cooling

15 to 30 Vac Thermostat

Congratulations on the purchase of your new thermostat!

Your new CT41A Thermostat replaces most 15 to 30V, 
4-wire, heating/cooling system thermostats. The CT41A 
is suitable for gas or oil heat or electric air conditioning 
systems. 

Direct questions about this thermostat to our Web site at 
www.honeywell.com/yourhome or call the customer 
information line at 1-800-468-1502.

If this control is replacing a control that contains 
mercury in a sealed tube, do not place your old 
control in the trash. Dispose of it properly.

Contact your local waste management authority 
for instructions regarding recycling and the 
proper disposal of an old control. 

If you are unsure about wiring procedures, please call a 
qualified service technician for assistance.

❑

To correctly install your new thermostat, follow these 
step-by-step instructions. It is recommended that, as 
you read, understand, and complete each step, you 
place a check mark in each box provided.

❑

See Your New CT41A Thermostat section above to 
determine the thermostat suitability for compatibility 
with your home system. If not, return it to the retailer. 
Acquire the required installation tools and supplies, as 
needed. See Fig. 1.

M10614

MERCURY
SWITCH

M20551

SCREWDRIVER

HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL

WIRE CUTTER/STRIPPER IF NEEDED TO STRIP WIRES

LEVEL, IF NEEDED TO LEVEL
THERMOSTAT FOR APPEARANCE