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Push excess wire back into wall and plug hole with
nonflammable insulation to prevent drafts from
affecting thermostat operation.
Remove thermostat cover by pulling outward on right
edge of cover until it snaps free of the thermostat
base.
Fasten thermostat to wall or vertical outlet box with a
screw through the top mounting hole. See Fig. 2 for
hole location.
Place a bubble level or plumb line against the
thermostat to find the level position. See Fig. 5. Start a
screw in the center of the bottom mounting hole.
(Move the temperature setting lever, if necessary, to
uncover the mounting hole.)
BUBBLE LEVEL
Fig. 5. Level thermostat.
Recheck for level positioning and firmly tighten both
mounting screws.
Be sure you have the current draw anticipator setting
for your system. This is the number you wrote in the
box in step 2 Remove Old Thermostat section. If you
could not find the current draw for step 2, look on your
primary control at the furnace. See Fig. 6. (The
primary control is usually a gas valve, zone valve, or a
relay or burner control box with the thermostat wires
connected to it. For electric heat, add the fan relay
current, usually 0.2A to 0.4A.)
SHOWS
VOLTAGE
RATING
FROM MAIN
FUEL SUPPLY
PLUMB
LINE
Fig. 6. Locate your system current draw anticipator
PLUMB
BOB OR
WEIGHT
M3774
3
CT41A HEATING/COOLING THERMOSTAT
24 Vac 50/60 Hz
0.4 AMP
TYPICAL GAS VALVE
setting.
Set the heat anticipator indicator at the rating printed
on the primary control. See Fig. 7.
CAUTION
Heat Anticipator Hazard.
Setting heat anticipator too low can cause
anticipator burnout.
Set heat anticipator at recommended rating to
avoid shorting out your valve or control and
prevent burnout of your heat anticipator.
Fig. 7. Set heat anticipator indicator to match your
primary control rating.
Press thermostat cover firmly onto the mounting clips.
See Fig. 2.
SHOWS
VOLTAGE
RATING
V8043E 1004 4
24V 50/60CY
SHOWS
.32 AMP @ 60CY
ANTICIPATOR
SETTING
ZONE VALVE
OIL BURNER CONTROL
SHOWS
SHOWS
CURRENT
VOLTAGE
DRAW
RATING
T
TO
T
BURNER
F
F
SHOWS
ANTICIPATOR
SETTING
M6116B
SCALEPLATE
ADJUSTABLE
HEAT
ANTICIPATOR
SETTING LEVER
M3784
69-0788-2
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