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M6115
Disconnect wires from old thermostat, wallplate or
subbase. Tape each end and label with the letter of
the terminal designation to make reconnection easier. If
there are only two wires labeling is not necessary.
4
MOUNT WALLPLATE OR SUBBASE
EXISTING
HORIZONTAL
OUTLET BOX
R
G
FAN
ON
AUTO
If mounting on outlet box , mount as shown in
appropriate illustration.
When mounting on wall, hold wallplate or subbase in
position and mark holes on wall. Use level to make
sure wallplate or subbase will be level. Drill 3/16 in. holes
and gently tap anchors into holes until flush with the wall.
3 SCREW HOLES
WITH PLASTIC
ANCHORS
R
G
FAN
ON
AUTO
HEATING/COOLING SUBBASE
BULB
SWITCH
ANTICIPATOR
SCALE
ANTICIPATOR
SETTING LEVER
O
B
W
HEATING/
COOLING
SUBBASE
Y
COOL
HEAT
OFF
M1553A
O
B
W
Y
COOL
HEAT
OFF
M1552A
IMPORTANT: If old thermostat has B or O terminals, this
thermostat cannot be used on your system.
EXCEPTION: The CT1802 Thermostat can be used
on a system with B or O terminals.
One or two extra wires?
If you are replacing a Honeywell Chronotherm
you may find one or two wires that go to the clock termi-
nals on the Chrontherm
not allow them to touch, or you may damage your trans-
former. Disconnect the wires, and wrap them separately,
using electrical tape. Do not wrap them together. Place
the wires where they will not interfere with the operation of
the new thermostat. Record the colors and terminal
designation labels of the remaining wires.
EXISTING
HORIZONTAL
OUTLET BOX
Position wallplate or subbase as shown in appropriate
figure, and loosely insert the screws supplied.
Carefully level the wallplate or subbase and firmly
tighten screws.
VERTICAL
OUTLET
BOX
MOUNTING
SCREWS (2)
M866
3
®
Thermostat,
®
Thermostat wiring wallplate. Do
R
W
HEATING-ONLY
WALLPLATE
M856A
196393A
ASSEMBLY
COVER
ADAPTER
PLATE
RING
O
B
W
R
Y
G
SUBBASE OR
WALLPLATE
MOUNTING
SCREWS (2)
69-0394—3
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