Williams 1403622 Owner's Manual page 12

Installation
Orifice Sizes
The efficiency rating of these appliances is a product thermal
efficiency rating determined under continuous operating
conditions and determined independently of any installed
system. For elevations above 4,500 feet reduce ratings 4% for
each 1,000 feet above sea level.
The correct orifice sizes for the different input ratings when
using natural or L.P. gas are:
CAPACITY AND ORIFICE SIZING
INPUT
MODEL GAS
RATING
NUMBER TYPE
Btu/hr.
14036 Series 14,000
Nat
14,000
14036 Series LP.
22036 Series 22,000
Nat
22,000
22036 Series LP.
30036 Series 30,000
Nat
30036 Series 30,000
LP.
Btu/hr. = British Thermal Units per hour.
CONVERSION KITS
Description
Natural Gas to L.P. Gas for 14036 Series
Natural Gas to L.P. Gas for 22036 Series
Natural Gas to L.P. Gas for 30036 Series
L.P. Gas to Natural Gas for 14036 Series
L.P. Gas to Natural Gas for 22036 Series
L.P. Gas to Natural Gas for 30036 Series
Gas Piping
The gas supply line must be of an adequate size to handle the
Btu/hr. requirements and length of the run for the unit being
installed.
Determine the minimum pipe size from Figure 14, basing the
length of the run from the gas meter or source to the unit.
All piping must comply with local codes and ordinances or with
the National Fuel Gas Code (ANSI Z223.1 NFPA No. 54),
whichever applies. (In Canada: CAN/C.G.A B149). Refer to
Figure 12 for the general layout of the unit. It shows the basic
fittings needed.
1. Use new, properly reamed pipe free from chips such as
steel or black iron pipe and fittings that are approved by
local codes. Metal chips and debris can damage the gas
valve.
12
Main Burner Orifice
HEATING
CAPACITY
RATING
DRILL DEC
Btu/hr.
10,039 #51
.0670
10,039 #58
.0420
16,462 #45
.0820
16,462 #55 .0520
21,849 #42 .0935
21,849 #53 .0595
Models
8925
8926
8927
8928
8929
8930
2. Do not thread the pipe too far. Distortion or malfunction may
result from excess pipe within the control valve. Apply a
moderate amount of good quality dope to the pipe threads
only. Leave the two end threads bare. (Figure 13). On L.P.
gas installations, use a compound resistant to action of
liquefied petroleum gases.
3. Use ground joint unions.
4. Install a drip leg (sediment trap) to trap dirt and moisture
before it can enter the gas valve. The nipple must be a
minimum of 3-inches long.
5. Install a manual shutoff valve.
QTY 6. Provide a 1/8" NPT test gauge connection immediately
before the gas supply connection to the furnace.
Gas Connection
1
1
If installation is for L.P. gas, use a two-stage regulator and
1
make all connections from the storage the tank to furnace.
1
Use two pipe wrenches when making the connection to the
1
valve to prevent turning and/or damage to the gas valve.
1
The connection between the shutoff valve and the burner
control assembly can be made with an A.G.A / C.G.A. design
certified flexible connector if allowed by local codes.
Tighten all joints securely.
FIGURE 12