Thermostat Installation - Williams 3501522A Owner's Manual

INSTALLING YOUR FURNACE
FIGURE 10 – AIR FROM OUTDOORS OR CRAWL SPACE
FIGURE 11 – FREE AREA
FURNACE
SQ. OF
BTU/hr. /
OPENING
INPUT
30,000 7.5
35,000 8.75
40,000 10.0
45,000 11.25
50,000 12.5
60,000 15.0
Shown in square inches - each opening (furnace only).
Based on one square inch per 4,000 BTU/hr.

Thermostat Installation

Williams' heaters are operated by a millivolt type
thermostat. Current to the thermostat is supplied by the
pilot generator. Do not connect to electricity. Anticipator
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
installation, 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.
12
VENTED ROOM HEATERS
REQUIRED NUMBER OF HOLES SILL OR
HEADER PLATES
1 1/2" 2"
7 4
8 5
9 5
10 6
11 6
13 8
(Sold Separately)
3. Before drilling a hole in the wall at the 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 ½-inch hole through the ceiling wall plate.
4. Probe for obstructions in the partition. Then drill a
½-inch hole through the wall at the selected location
for thermostat.
5. From the attic, feed the thermostat cable or a stiff wire
through the wall until even with the thermostat
location.
6. Snag the thermostat cable through the hole and pull
the cable through the hole in the wall so that 6
inches of the cable protrudes.
7. Route the cable to the wall heater.
8. Never use nails or staples across the thermostat wires.
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
Refer to installation instructions packed in the thermostat
carton if you have any doubt about the above procedures.
3"
Use Williams thermostat
thermostat.
2
2
WALL-MOUNTED THERMOSTAT INSTALLATION
3
1. To remove the thermostat cover, squeeze both sides
and lift.
3
2. Connect the thermostat wires to the terminal screws
3
on the thermostat base. Make sure the wiring does
not interfere with thermostat operation.
4
3. Push any excess wire back through the hole in the wall
and plug the hole with insulation to prevent drafts from
affecting thermostat operation.
4. Being sure to level the thermostat for best
appearance, fasten the thermostat base to the wall
through the mounting holes with screws provided.
5. Replace the thermostat cover.
6. Do not run wire in any location where it might be
damaged. Avoid splicing thermostat wires unless the
spliced wires are properly cleaned, soldered and taped.
7. Use #18 gauge wire as supplied for a maximum length
of 20 feet. If longer length is needed, use #16 gauge
wire for a maximum length of 25 feet.
8. Connect the thermostat wires to the control valve as
shown in Figure 12.
CABINET-MOUNTED THERMOSTAT INSTALLATION
1. Locate the knockout on the right side of the heater to
mount the thermostat. Remove the knockout by
P322016 or any millivolt