Installation Instructions

Installation
12
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 2,000 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:
MODEL
NUMBER
GAS
TYPE
INPUT
RATING
Btu/hr.
HEATING
CAPACITY
RATING
Btu/hr.
Main Burner Orifice
DRILL DEC QTY
14038 Series
Nat
.
14,000 9,800 #50
.070
0
1
1
403
8
Series
L
.
P.
14,000 9,800 #56
.046
0
1
22038 Series
Nat
.
22,000 16,210 #44
.086
0
1
2203
8
Series
L
.
P.
22,000 16,595 N/A .0560 1
30038 Series
Nat.
30,000 21,000 #39 .0990 1
30038 Series
L.P.
30,000 21,000 N/A .0640 1
Btu/hr. = British Thermal Units per hour.
Description Models
Natural Gas to L.P. Gas for 14038 Series 8939
Natural Gas to L.P. Gas for 22038 Series 8940
Natural Gas to L.P. Gas for 30038 Series 8941
L.P. Gas to Natural Gas for 14038 Series 8942
L.P. Gas to Natural Gas for 22038 Series 8943
L.P. Gas to Natural Gas for 30038 Series 8944
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.
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.
6. Provide a 1/8" NPT test gauge connection immediately
before the gas supply connection to the furnace.
Gas Connection
If installation is for L.P. gas, use a two-stage regulator and
make all connections from the storage the tank to furnace.
Use two pipe wrenches when making the connection to the
valve to prevent turning and/or damage to the gas valve.
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
CONVERSION KITS
CAPACITY AND ORIFICE SIZING