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1
PREPARATION
Check thermostat and wallplate suitability for your heating or heating/cooling system. Refer to Table 1.
Thermostat
Subbase Wallplate
Model
Included
CT1800
199986B Wallplate
CT1801
Q682A1079 Subbase
CT1802
Q682B1227 Subbase
a
Thermostat must be mounted on wallplate or subbase included in package to assure operation.
Assemble tools as required.
FLAT BLADE
SCREWDRIVER
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
LEVEL TO LEVEL THERMOSTAT
FOR ACCURATE OPERATION
2
UNPACK THERMOSTAT
Remove and discard shipping wrap. Save package
of screws, instructions and receipt.
Remove thermostat cover by lifting up from the
bottom.
Carefully remove insert protecting switch bulbs.
Loosen two captive mounting screws, and separate
wallplate or subbase from back of thermostat base.
3
REMOVE OLD THERMOSTAT
Remove cover of old thermostat. If the cover does
not snap off when pulled firmly from the bottom,
check for a screw that locks on the cover.
Before removing the old thermostat from the wall,
look at it carefully to locate the heat anticipator
adjustment mechanism. (See illustration to help you
69-0394—3
TABLE 1—THERMOSTAT AND SUBBASE APPLICATIONS.
2- or 3- wire, 150 to 30 volt control circuit. For gas or oil heating system or
3-wire zone valve heating system.
4- or 5- wire, 15-30 volt control circuit. For gas or oil heating/cooling system.
4- wire, 15 to 30 volt control circuit. For single-stage heat pump without
auxiliary heat or central electric heating/cooling systems that require the
thermostat to control the fan in heating.
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
MASKING TAPE, IF NEEDED
TO LABEL WIRES
DISCONNECTED FROM
OLD THERMOSTAT
M834A
For Use With
If wallplate or subbase is mounted on a vertical
outlet box (check old installation), order 196393A
Cover Plate and Adapter Ring (see appropriate illustration
in Step 4). To order check your telephone directory for your
local Honeywell distributor.
Test to make certain that your heating and cooling
systems are working. If either one does not work,
contact your local heating/air conditioning dealer.
NOTE: Do not operate cooling sytem if outdoor tempera-
ture is below 50°F (10°C)
Turn off power to the heating/cooling system at the
main fuse panel.
recognize the heat anticipator.) Make a note here
of that anticipator setting for future reference. If your
thermostat does not have a heat anticipator, do not be
concerned. Move on to next paragraph.
Loosen screws holding thermostat to wallplate,
subbase or wall and lift away.
2
a
THERMOSTAT
COVER
LIFT
COVER
CAPTIVE
MOUNTING
SCREWS
THERMOSTAT
BASE
M9617
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