Gas Supply And Piping - Williams 2509822 Owner's Manual

Installing Your Furnace
Attaching Your Furnace (continued)
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.

Gas Supply and Piping

GAS 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
The gas supply line must be of adequate size to handle the Btu/hr.
connect the piping.
requirements and length of the run for the unit being installed.
Determine the minimum pipe size from Figure 17, basing the
length of the run from the gas meter or source to the unit.
WARNING: Danger of property damage, bodily injury or
death. Make sure the furnace is equipped to operate on
the type of gas available. Models designed as natural gas
All piping must comply with local codes and ordinances or with the
are to be used with natural gas only. Models designed for
National Fuel Gas Code (ANSI Z223.1 NFPA No. 54), whichever
use with liquefied petroleum (L.P) gas have orifices sized
applies. (In Canada: CAN/C.G.A B149). Refer to Figure 18 for
for commercially pure propane gas. They cannot be used
the general layout of the unit. It shows the basic fittings needed.
with butane or a mixture of butane and propane.
The following rules apply:
GAS SUPPLY
1. Use new, properly reamed pipe free from chips such as
steel or black iron pipe and fittings or other approved by
For L.P. gas, the minimum inlet gas supply pressure for the
local codes.
purpose of input adjustment is 11-inches water column. The
maximum inlet gas supply pressure is 13-inches water column.
2. Do not thread pipe too far. Valve distortion or malfunction
may result from excess pipe within the control. Apply a
For natural gas, the minimum inlet gas supply pressure for the
moderate amount of good quality dope to pipe only. Leave
purpose of input adjustment is 5-inches water column.
the two end threads bare. If L.P. gas installation, use
maximum inlet gas supply pressure is 7-inches water column.
compound resistant to action of liquefied petroleum gases.
Gas pressure and input to the burners must not exceed the rated
3. Use ground joint unions.
input and pressure shown on the nameplate. The natural gas
manifold pressure should be 4-inches water column.
4. Install a drip leg (sediment trap) to trap dirt and moisture
manifold pressure should be 10-inches water column for L.P. gas.
before it can enter the gas valve. The nipple must be a
For operation in elevations above 2,000 feet, a burner orifice
minimum of 3-inches long.
change may be required to suit the gas supplied. Check with
5. your local gas supplier. Install a manual shut-off valve.
6. ORIFICE SIZES Provide a 1/8 NPT test gauge connection immediately
before the gas supply connection to the furnace.
The efficiency rating of this appliance is a product thermal
efficiency rating determined
conditions and was determined independently of any installed
Gas Supply and Piping (continued)
system. For elevations above 2,000 feet, reduce ratings 4% for
each 1,000 feet above sea level.
16
under continuous operating
FIGURE 12 – Mounting Rear Outlet Register
Furnace Technical Information
Furnace Technical Information
Model Gas
Number Type
2509822 Nat.
2509821 L.P.
3509822 Nat.
3509821 L.P.
5009822 Nat.
5009821 L.P.
Gas Conversion Kits
Natural Gas to L.P. Gas
Model
8907 25098 Series with Williams Brand Gas Valve
The
8908 35098 Series with Williams Brand Gas Valve
8909 50098 Series with Williams Brand Gas Valve
The
Gas Conversion kits
L.P. Gas to Natural Gas
Model
8910
25098 Series with Williams Brand Gas Valve
8911 35098 Series with Williams Brand Gas Valve
8912
50098 Series with Williams Brand Gas Valve
Heating
Input Main Burner Orifice
Capacity
Rating
Rating
Btu/hr. Drill Decimal Quantity
Btu/hr.
25,000 18,935 #42
25,000 19,759 #53
35,000 24,496 #36
35,000 25,588 #51
50,000 38,490 #42
50,000 39,827 #53
Description
Description
0.093 1
0.059 1
0.106 1
0.067 1
0.093 2
0.059 2