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WARNING: Gas burning appliances require air for combustion and proper venting. Minimum fresh air opening of 1 square inch per 1,000 BTU per
hour input rating must be provided for ventilation. EXAMPLE: A 30,000 BTU per hour input unit requires the equivalent of a 30 inch wide window be
open 1 inch for safe operation.
A. In choosing the location for the heater, the following factors should be considered:
1. Convenience to gas supply.
2. Arrangement of rooms or area to be heated.
3. Probable location of furniture.
4. General appearance.
5. Safe clearance from anything that could catch fire.
6. Ability to properly vent the heater.
B. Locate the heater centrally in the area which it is to heat. The ideal location is at the
source of cold air, which is an outside wall. If the heater is on an outside wall, the cold
air will be warmed before it moves through the room.
C. Place the heater where the air will circulate freely throughout the area to be heated. If one heater is intended to heat the entire house, it is
advisable to consider the installation of grilles immediately below the ceilings to permit circulation of hot air from room to room. Return air grilles
are also desirable.
D. Be certain the heater is placed where the air is free to circulate around it. Never install the heater in a wall recess. The minimum clearance
required to any wall or object can be found on the rating plate located inside the furnace control door on the base plate. We recommend a 24-inch
min. clearance from the burner access door for the ease of lighting and for observation of pilot and burner flames.
E. Heater must be installed so that the drafthood is in the same pressure zone as the combustion air.
F. The heater may be placed directly on wood floors. Heavy pile or shag rugs
may restrict normal air flow. Some floor coverings discolor easily from
even low heat. To assure safe operation, a metal or wood panel, extending
the full depth and width of the appliance must be placed under the heater.
Optional floor boards are available from Williams.
G. Do not place heater where curtains, draperies, or any other material may
come into contact with any part of the heater.
Gas Controls
A. All models are regulated on natural and L.P. gases.
The regulator is built into the gas control valve.
B. All models are equipped with a 100% pilot safety shutoff and
vent safety shutoff system.
C. CAUTION: Do not connect 115V electrical service line to gas
control valve or wall thermostat.
Gas Supply
For natural gas, the minimum inlet gas supply pressure for the purpose of input
adjustment is 5" water column. The maximum inlet gas supply pressure is 7"
water column.
For L.P. gas, the minimum inlet gas supply pressure for the purpose of input
adjustment is 11" water column. The maximum inlet gas supply pressure is 13"
water column.
Gas pressures and input to the burners must not exceed the rated input and
pressure shown on the rating plate. On natural gas the manifold pressure
shown should be 4" water column. The manifold pressure should be 10.5" water
column for L.P. gas.
Orifice changes may be required to suit gas supplied.
For heaters located at elevations between sea level and 4,500 feet, the
measured input must not be greater than the input shown on the rating plate of
the heater. For elevations above 4,500 feet, the measured input must not
exceed the input of the rating plate reduced by 4 percent for each 1,000 feet
that the heater is above sea level.
Locating the Heater
Minimum Fresh Air Opening is 1 Square Inch Per 1,000 Btu/Hr
Danger of property damage, bodily injury
or death. Even when a house meets
requirements for unconfined space with
recommended that a fresh air intake be
installed to lessen the possible dangers
from any future changes on the home.
MINIMUM REQUIRED CLEARANCES
MODEL
200 SERIES
350 SERIES
500 SERIES
650 SERIES
24" MIN. CLEARANCE IS RECOMMENED
24" min. Clearance is recommended on side
ON SIDE WITH BURNER ACCESS DOOR FOR
with burner access door for ease of lighting
EASE OF LIGHTING AND FOR OBSERVATION
and for observation of pilot and burner
OF PILOT AND BURNER FLAMES.
flames.
FINISHED
FLOOR
0" MIN.
CLEARANCE
Open in front to
provide service,
access and
clearance to
combustibles.
3
WARNING
adequate air infiltration, it is
"A"
"B"
SIDE
CEILING
2"
22"
6"
57"
6"
57"
6"
57"
'A'
HEATER
FRONT VIEW
'B'
HEATER
'C'
SIDE VIEW
Figure 1
"C"
REAR
3"
6"
6"
6"
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