Instructions / Assembly

Installing Your Heater
12
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.
Wall-Mounted Thermostat Installation
1. To remove the thermostat cover, squeeze both sides and lift.
2. Connect the thermostat wires to the terminal screws on the
thermostat base. Make sure the wiring does not interfere with
thermostat operation.
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 taping lightly with a
screwdriver. It will also be necessary to cut the inside panel
insulation about a ½-inch in diameter for clearance to the
knockout.
2. Cut the thermostat wire to the desired length.
3. Connect the thermostat wires to the terminal screws on the
back of the thermostat base.
4. Feed the thermostat wires through the knockout and route
through the metal clip to the gas valve. Models, 2001621 and
2001622 do not have a metal clip.
5. Mount the thermostat to the side of the cabinet with screws
provided.
6. Replace the thermostat cover.
7. Connect the thermostat wires to the control valve as shown in
Figure 5.
IMPORTANT: KEEP THE THERMOSTAT WIRE
AWAY FROM THE COMBUSTION CHAMBER.
FIGURE 12 Thermostat Wiring
FIGURE 13 Cabinet-Mount Clearance
(1.7 mm)
7/8”
(0.87 mm)
19/32”
(0.59 mm)
(0.09 mm)