69-0750—1
2
M3375
Recycling Notice
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
If this control is replacing a control that contains mer-
cury in a sealed tube, do not place your old control in the
trash.
Contact your local waste management authority for
instructions regarding recycling and the proper disposal of
this control, or of an old control containing mercury in a
sealed tube.
If you have questions, call Honeywell Inc. at 1-800-
468-1502.
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for your
application.
3. Installer must be a trained experienced service
technician.
4. After installation is complete, check out product op-
eration as provided in these instructions.
CAUTION
1. Disconnect power supply to prevent electrical
shock or equipment damage.
2. Run wires as close as possible to the subbase.
To prevent interference with the thermostat
linkage, keep wire length to a minimum. Push
excess wire back into the hole and plug hole
to prevent drafts from affecting thermostat
operation.
3. Do not overtighten thermostat captive
mounting screws because damage to subbase
threads may result.
4. Do not short across coil terminals on relay;
this may burn out the heat anticipator.
LOCATION
Locate thermostat about 5 ft [1.5m] above the floor in an
area with good air circulation at average temperature. Do
not mount the thermostat where it may be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from the sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas behind the thermostat.
Run wires from the heating, cooling or heating-cooling
equipment to the new thermostat location.
The number of wires required to connect this thermostat
to the heating, cooling or heating-cooling equipment de-
pends on how the thermostat is powered—by the 24 Vac or
battery, or through the control system. Refer to the Typical
Wiring Diagrams section to determine the number of wires
required for your application.
UNPACK THERMOSTAT
Handle your new thermostat carefully; rough handling
may interfere with its accuracy. Before unpacking, refer to
Fig. 1.
Remove and discard the shipping wrap.
IMPORTANT: Save package of screws and instructions
for the homeowner.
Fig. 1—Unpack thermostat.
Remove the thermostat cover by lifting from the bottom.
Set aside cover until needed later.
Carefully remove the material protecting the mercury
switch bulb.
Loosen two captive mounting screws and separate the
wallplate (if provided) from the back of the thermostat base.
MOUNT WALLPLATE OR SUBBASE
Wall Mounting (See Fig. 2)
Hold the wallplate or subbase in position on the wall.
See Fig. 2.
Mark holes on the wall for anchors. Use the spirit level
to make sure the wallplate or subbase is level.
Drill 3/16 in. holes and gently tap the anchors into the
holes until flush with the wall.
Pull wires through the large wiring hole in the wallplate
or subbase.
Loosely fasten the wallplate or subbase to the wall with
the three screws. Do not tighten the screws completely.
Carefully level the wallplate or subbase and firmly
tighten the screws. See Fig. 3.
Outlet Box Mounting (See Fig. 4)
Use a horizontally mounted outlet box if possible. If a
vertical outlet box is used, mount the wallplate or subbase
on a 193121A (beige) or 202689A (white) Cover Plate
Assembly (ordered separately). Follow the instructions
provided with the cover plate assembly.
Align wallplate or subbase mounting holes on the outlet
box and loosely fasten with two screws.
Carefully level the wallplate or subbase and firmly
tighten the screws. See Fig. 3.
12
6
3
9
50
60
70
80
THERMOSTAT
COVER
LIFT
COVER
CAPTIVE
MOUNTING
SCREWS
THERMOSTAT
BASE
M1518