CAUTION:
Connect the gas pipe to the furnace using a
backup wrench to avoid damaging gas controls.
WARNING:
Never purge a line into a combustion
chamber. Never use matches, candles, flame, or other
sources of ignition for to check for gas leakage. Use a
soap-and-water solution to check for gas leaks. Failure to
follow this warning could result in fire, explosion, per-
sonal injury, or death.
Joint compounds (pipe dope) should be applied sparingly and only
to the male threads of the joints. This pipe dope must be resistant
to the action of propane gas.
An accessible manual shutoff valve MUST be installed upstream
of the furnace gas controls and within 72 in. of the furnace. A
1/8-in. NPT plugged tapping, accessible for test gage connection,
MUST be installed immediately upstream of the gas supply
connection to the furnace and downstream of the manual shutoff
valve. Place a ground joint union between the gas control manifold
and the manual shutoff.
Install a sediment trap in the riser leading to the furnace. The trap
can be installed by connecting a tee to the riser leading from the
furnace. Connect a capped nipple into the lower end of the tee. The
capped nipple should extend below the level of the gas controls.
(See Fig. 13.)
Piping should be pressure tested in accordance with local and
national plumbing and gas codes before the furnace has been
attached. If the pressure exceeds 0.5 psig (14-in. wc), the gas
supply pipe must be disconnected from the furnace and capped
Fig. 11—Horizontal Filter Arrangement
A82173
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FIELD-SUPPLIED
FILTER RETAINERS
AIRFLOW
D
12
″
4
″
TABLE 4—FILTER INFORMATION (IN.)
FURNACE CASING
WIDTH
FILTER SIZE AND QUANTITY
D
14-3/16
(2) 16 X 20 X 1
15–3/8
17-1/2
(2) 16 X 20 X 1
14–3/4
21
(2) 16 X 20 X 1
13–3/4
24-1/2
(2) 16 X 20 X 1
12–1/2
Fig. 12—Downflow Filter Arrangement
A88486
RETURN-AIR
PLENUM
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AIRFLOW
ACCESS DOOR
INSTALLATION
POSITION
OF FILTERS
TABLE 5—MAXIMUM CAPACITY OF PIPE*
NOMINAL IRON
PIPE SIZE
(IN.)
INTERNAL
DIAMETER
(IN.)
LENGTH OF PIPE (FT)
10
20
30
40
50
1/2
0.622
175
120
97
82
73
3/4
0.824
360
250
200
170
151
1
1.049
680
465
375
320
285
1–1/4
1.380
1400
950
770
660
580
1–1/2
1.610
2100
1460
1180
990
900
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, and a
pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table
10-2 NFPA 54/ANSI Z223.1-1996.
Fig. 13—Typical Gas Pipe Arrangement
A89414
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
—10—
