Gas Supply And Piping - Williams 2509822A Owner's Manual

Attaching Your Furnace
After furnace is in position, install rear outlet register as shown
in Figure 12. Have damper in open position when inserting
the assembly. Secure the rear outlet register to speed nuts
with the machine screws furnished.
FIGURE 12 – MOUNTING REAR OUTLET REGISTER
FURNACE SHIELDS
PLASTER GROUND
REAR REGISTER
OUTLET

Gas Supply and Piping

The gas control valve, in the furnace, is shipped with a seal
over the gas inlet tapping. Do not remove the seal until ready
to connect the piping.
WARNING: Danger of property damage, bodily
injury or death. Make sure the furnace is equipped to
operate o the type of gas available. Models designed
as natural gas are to be used with natural gas only.
Models designed for use with liquefied petroleum
propane gas have orifices sized for commercially pure
propane gas. They cannot be used with butane or a
mixture of butane and propane.
GAS SUPPLY
For propane gas the minimum inlet gas supply pressure for
the purpose of input adjustment is 11-inches water column.
The maximum inlet gas supply pressure is 13-inches water
column.
For natural gas, the minimum inlet gas supply pressure for
the purpose of input adjustment is 5-inches water column.
The maximum inlet as supply pressure is 7-inches water
column.
Gas pressure and input to the burners must not exceed
the rated input and pressure shown on the nameplate. The
natural gas manifold pressure should be 4-inches water
column. The manifold pressure should be 10-inches water
column for propane gas. For operation in elevations above
continued
2,000 feet, a burner orifice change may be required to suit
the gas supplied. Check with your local gas supplier.
ORIFICE SIZES
The efficiency rating of this appliance is a product thermal
efficiency rating determined under continuous operating
conditions and was determined independently of any
installed system. For elevations above 2,000 feet, reduce
ratings 4% for each 1,000 feet above sea level.
MODEL
NUMBER
2509822A NATURAL
2509821A PROPANE
3509822A NATURAL
3509821A PROPANE
5009822A NATURAL
5009821A PROPANE
8907
8908
8909
8910
8911
8912
FURNACE TECHNICAL INFORMATION
HEATING
INPUT
GAS CAPACITY
RATING
TYPE RATING
BTU/hr.
BTU/hr.
25,000 18,935
25,000 19,759
35,000 34,496
35,000 25,588
50,000 38,490
50,000 39,827
GAS CONVERSION KITS
NATURAL GAS TO PROPANE GAS
25098 SERIES WITH WILLIAMS BRAND GAS VALVE
35098 SERIES WITH WILLIAMS BRAND GAS VALVE
50098 SERIES WITH WILLIAMS BRAND GAS VALVE
GAS CONVERSION KITS
PROPANE GAS TO NATURAL GAS
25098 SERIES WITH WILLIAMS BRAND GAS VALVE
35098 SERIES WITH WILLIAMS BRAND GAS VALVE
50098 SERIES WITH WILLIAMS BRAND GAS VALVE
MONTEREY PLUS TOP VENT GAS WALL HEATER
MAIN BURNER ORIFICE
DRILL DECIMAL QUANTITY
#43 0.089 1
.057" 1
#36 0.106 1
.069" 1
.091" 2
.058" 2
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