Mounting The Thermostat - Williams 5001922 Owner's Manual

Thermostat Installation
Models with the last two digits "11" (or) "12" utilize a built-
in thermostat control system operated by a heat sensing
bulb located in the burner compartment.
IMPORTANT
I andle the bulb with care. Do not kink the connec-
ting tubing.
Models with the last two digits "21" (or) "22" are operated
by a millivolt type thermostat. Current to the thermostat
is supplied by the pilot generator. Anticipation settings are
not required.
1. If an old thermostat is being replaced and is in a
satisfactory location and the wiring appears to be in
good condition, use existing wiring. If in doubt, use new
wire.
2. If a new location is chosen or if this is a new installa-
tion, thermostat cable must first be run to the location
selected. All wiring must agree with local codes and
ordinances. These instructions cover bringing the wire
down from the attic but it can be run from a basement
or crawl space using similar methods.
3. Before drilling hole in wall at selected location, drive
a small finishing nail through the ceiling in the corner
of the wall and ceiling above the thermostat location.
Pull the nail out and push a small stiff wire through the
hole so it can be found in the attic. Drill a 1/2-inch hole
through the ceiling wall plate.
4. Probe for obstructions in the partition. Then drill a
1/2-inch hole through wall at selected location for
thermostat.
5. From the attic, feed the thermostat cable or a stiff wire
through wall until even with thermostat location.
6. Snag thermostat cable through hole and pull cable
through hole in wall so that 6 inches of cable protrubes.
7. Route cable to heater.
MOUNTING THE THERMOSTAT
1. To remove thermostat cover, squeeze both sides and
lift.
2. Connect thermostat wires to the thermal screws on the
back of thermostat base.
,
4.
Push any excess wire back through hole in wall and
plug hole with insulation to prevent drafts from affect-
ing thermostat operation.
Be sure to level thermostat for best appearance, fasten
thermostat base to wall through mounting holes with
screws provided.
5. Replace the thermostat cover.
CAUTION
Do not run wire in any location where it might be
damaged. Avoid slicing thermostat wire unless the
spliced wires are properly cleaned, soldered and
taped.
NOTE
Use #18 Ga. wire as supplied for maximum length of 20
feet. If longer length is needed, use #16 Ga. for maximum
length of 25 feet.
Refer to installation instructions packed in the thermostat
carton if you have any doubt about the above procedures.
Connect thermostat wire, previously run to burner com-
partment from thermostat, to control valve as shown in
Fig. 4.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION
WHEN SERVICING CONTROLS. WIRING ERRORS
CAN CAUSE IMPROPER AND DANGEROUS OP-
ERATION. VERIFY PROPER OPERATION AFTER
SERVICING.
THERMOSTAT GENERATOR
€--- WHITE BLUE
KNOB
WILLIAMS
LIMIT SWITCH
P172100A (OR)
P172200A
J GENERATOR THERMOSTAT
LIMIT SWITCH
GREEN KNOll
WILLIAMS
P295000A (OR}
P295001A
Fig. 4
--8--