Installing Your Heater
6
The following steps are needed for proper installation and safe
operation of your heater. If you have any doubts as to any
requirements, check with local authorities for local and state
codes affecting the installation.
Obtain professional help where needed.
DO NOT
install this heater in a travel trailer, recreational vehicle,
or mobile home.
IMPORTANT
For satisfactory and trouble-free operation, be sure to:
1. Locate the heater properly within the space to be heated.
2. Provide for adequate combustion air, adequate air circulation
around the cabinet inside the open room and a proper vent
system.
3. Maintain all minimum clearances which apply to your heater.
Locating the Heater
WARNING:
Gas burning appliances require air for
combustion and proper venting. Minimum fresh air
opening of 1 square inch per 1,000 Btu/hr. input
rating must be provided for ventilation.
EXAMPLE: A 30,000 Btu/hr. input unit requires the equivalent of a
30 inch wide window be open 1 inch for safe operation.
WARNING:
Danger of property damage, bodily
injury or death. Even when a house meets
requirements for unconfined space with adequate
air infiltration, it is recommended that a fresh air
intake be installed to lessen the possible dangers
from any future changes on the home.
Consider the following points before attempting to install the
heater:
1. In choosing the location for the heater, the following factors
should be considered:
a. Convenience to the gas supply.
b. Arrangement of the rooms or area to be heated.
c.
Probable location of the furniture.
d. General appearance.
e. Safe clearance from anything that could catch fire.
f.
Ability to properly vent the heater.
2. 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.
3. 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.
4. 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 heater 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.
5. The heater must be installed so that the draft hood is in the
same pressure zone as the combustion air.
6. 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.
7. Do not place the heater where curtains, draperies, or any
other material may come into contact with any part of the
heater.
GAS CONTROLS
1. All models are regulated on natural or L.P. Gases. The
regulator is built into the gas control valve.
2. All models are equipped with a 100% pilot safety shutoff and
vent safety shutoff system.
3.
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.
The gas pressure and input to the burners must not exceed the
rated input and pressure shown on the rating plate. On Natural
Gas, the manifold pressure should be 4 inches water column. The
manifold pressure should be 10 inches water column for L.P. Gas.
Orifice changes may be required to suit the gas supplied.
For heaters located at elevations between sea level and 2,000
feet, the measured input must not be greater than the input shown
on the rating plate of the heater. For elevations above 2,000 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.
MINIMUM REQUIRED CLEARANCES
MODEL
"A" SIDE
"B" CEILING
"C" REAR
200 SERIES
350 SERIES
500 SERIES
650 SERIES
2"
6"
6"
6"
36"
57"
57"
57"
3"
6"
6"
6"
24” min. Clearance is recommended on side with burner access
door for ease of lighting and for observation of pilot and burner
flames.
