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Copyright © 2003 Honeywell • •All Rights Reserved
OWNER’S GUIDE
69-1620-1
CT3451
Programmable Thermostat
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Congratulations on the purchase of your new thermostat!
More than 100 years of Honeywell engineering produced
this thermostat that can provide you with a more
comfortable and convenient living environment.
Your new thermostat automatically controls the
temperature in your home, keeping you comfortable
while saving energy when programmed according to
these instructions.
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.
MERCURY NOTICE
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.
1 PREPARE FOR INSTALLATION
❑ Check Table 1 to make sure this thermostat is
compatible with your system. If not, return it to the
retailer.
❑ Acquire tools and items, as needed. See Fig. 1.
Fig. 1. Required installation tools/supplies.
M10614
MERCUR
Y
SWITCH
T
YPICAL LOCATION OF A MERCURY
S
WITCH IN A THERMOSTAT
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