Williams 5001922 Owner's Manual page 5

LOCATING THE HEATER -- MINIMUM FRESH AIR OPENING IS 1 SQUARE INCH PER 1,000 BTUIHR.
WARNING: Gas burning appliances require air for combusion and proper venting. Minimum fresh air opening of 1 square
inch per 1000 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 funiture.
4. General appearance.
5. Safe clearance from anything that could catch fire.
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 adviseable 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 cimulate 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. NOTE: Heater must be installed so that 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 floorboard extending
the full depth and width of the appliance must be
placed under the heater.
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.R gases.
The regulator is built into the gas control valve.
B. All models are equipped with a 100% pilot safety shut-
off and a vent safety shut-off 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.R 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 should be 4 inches
water column. The manifoldpressure ,shouldbe 10.5 inches
water column for L.P. Gas.
Orifice change may be required to suit gas supplied.
Check with your WILLIAMS service department.
FOr heater located at elevations between sea level and
2000 feet, the measured input must not be greater than
the input shown on the rating plate of the heater. For eleva-
tions above 2000 feet, the measured input must not ex-
ceed the input of the rating place reduced by 4 percent
for each 1000 feet that the heater is above sea level.
REQUIRED CLEARANCE
MODEL "A" "B" "C"
SIDE CEIUNG REAR
200 SERIES 2" MIN. 22" MIN. 3" MIN.
350 SERIES 6" MIN. 57" MIN. 6" MIN.
!500 SERIES 6" MIN. 57" MIN. 6" MIN.
650 SERIES 6" MIN. 57" MIN. 6" MIN.
=
OBSL='RVA'nON OF PILOTAND BURNER FLAMES.
o" \
FRONT VIEW
Fig. 1
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