Williams 2001622 Installation & Operating Instruction Manual page 9

Vented room heaters
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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 its' 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 shutoff 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.
A. 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:
1. Keep the flue gasses hot.
2. Follow the vent manufacturer's installation instructions.
3. Select the proper vent size.
4. Provide constant fresh air replacement.
B. 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.
C. Use vent pipe of the same size as the outlet on back of heater. In no case should a different size vent be used. Single wall vent pipe may be
attached directly to the drafthood of the room heater when a clearance of 2-1/2 inches (64mm) is maintained between the single wall vent pipe and
the combustible wall of the room in which the room heater is located. Use double wall vent pipe for clearances less than 2-1/2 inches (64mm) to
combustibles.
D. Avoid a horizontal run to vent pipe whenever possible. When a horizontal run is necessary, the pipe must pitch upward at least 1/4 inch to the foot.
It must be supported securely and joints fastened by sheet metal screws or rivets. Under no circumstances should the vent run downhill.
E. Never put a damper or barometric draft control in a gas vent pipe.
F. Never end a vent in an open attic or run vent through a wall to the outside without extending it
upward above the roof.
G. Always terminate vent with an approved cowl.
H. ALWAYS SECURE VENT PIPE TO OUTLET ON BACK OF HEATER WITH A SHEET METAL SCREW.
I. Flue pipe should extend through the wall of a chimney to be flush with inner wall.
J. Flue pipe must be adequately supported by metal strips.
K. For flue pipe running through walls and roofs, use B-1 (1 inch (25mm) clearance to combustibles) vent pipe.
L. Chimneys should extend at least 2 feet (.6m) above the roof and above any object or nearby building within 10 feet (3m).
M. Open tees should not be used in the flue pipe.
N. Heater must not be connected to a chimney flue that is servicing a separate solid-fuel burning appliance.
O. For proper venting, do not attach a 90 degree elbow directly to draft diverter. It is recommended to attach 2 feet (.6m) of straight vent pipe before
an elbow is used. Use 45 degree elbows if possible. Run flue pipe as direct as possible with a minimum of elbows.
P. The use of more than one appliance per vent system may cause the vent safety shutoff device to shut off the heater due to the cooling of vent
temperatures through the draft diverter of the second appliance.
Q. The vent safety shutoff may shut down the heater if a too large or an unlined, masonry chimney is used. The vent may not warm quickly enough
to get adequate vent action in a chimney before the shutoff device will shut down the heater. If this is the case, it is recommended lining the chimney
with proper size type "B" vent pipe or type "B" chimney liner.
R. Single-wall metal pipe should not be used outdoors in cold climates or venting gas equipment. If the vent is installed directly outside, the cold pipe
may delay the venting and cause the heater to shut-off by the vent safety switch. To prevent this problem, as well as condensation of flue products,
an insulated enclosure is recommended. Use type B, vent pipe and maintain at least a one inch clearance to combustibles. Use a metal thimble to
protect vent pipe as it passes through combustibles.
Venting
IMPORTANT: Inspect venting system prior to each heating season.
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
gasses. Most homes will require that outside
air be supplied into the heater area.
8
Warning
Warning
Danger of property damage, bodily
injury or loss of life. Do not install
heater in any area where oxygen
is in use.

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