Williams 3501522A Owner's Manual page 13

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,
2001621A and 2001622A
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 12.
IMPORTANT: KEEP THE THERMOSTAT WIRE AWAY
FROM THE COMBUSTION CHAMBER.
FIGURE 12 - THERMOSTAT WIRING
FIGURE 13 - CABINET-MOUNTED CLEARANCE
do not have a metal clip.
Vent Installation
This heater must be properly connected to a venting system. This
heater is equipped with a vent safety shutoff system to protect
against improper venting of combustion products. Tampering
with or removal of this control will void the limited warranty and
can result in carbon monoxide (CO) poisoning and possible death.
WARNING: Operation of this heater, when not
connected to a properly installed and maintained venting
system or tampering with the vent safety shutoff system, can
result in carbon monoxide (CO) poisoning and possible death.
This appliance needs fresh air for safe operation and must be
installed so there are provisions for adequate combustion and
ventilation air. This room heater is equipped with a vent safety
switch. The vent safety switch will cause gas flow to the main
burner to shutoff due to improper venting or a blocked flue. If the
vent safety switch continues to shut off the gas flow, a qualified
service person must be contacted to inspect for improper venting,
blockage in the vent pipe or the vent safety switch for being
defective.
WARNING: Do not bypass the vent safety shutoff switch.
To do so could expose the consumer to property damage,
personal injury or possible death.
WARNING: Danger of illness, bodily injury or death.
This heater and any other fuel burning appliance must be
provided with enough fresh air for proper combustion and
ventilation of flue gases. Most homes will require that outside
air be supplied into the heater area.
1. An effective flue is necessary to carry off water vapor,
carbon monoxide (CO), carbon dioxide (CO2), and other
products of combustion. For proper venting, follow the
following basic rules for gravity venting, which are:
a. Keep the flue gases hot.
b. Follow the vent manufacturer's installation
instructions.
c. Select the proper vent size.
d. Provide constant fresh air replacement.
2. For new installation, it is recommended that a Type "B"
vent in accordance with its' listing be used. A Type
"B" vent is one made of non-combustible, corrosion
resistant material of sufficient thickness, cross
sectional area and heat insulating quality to avoid
excess temperatures on adjacent combustible
material and certified by a nationally recognized
testing agency. Existing brick flues should be lined to
provide an effective vent. Brick chimneys, even in good
repair, may be too large and will not provide sufficient
draft to effectively vent a heater.
13
VENTED ROOM HEATERS