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AIRFLOW
12"
FIELD-SUPPLIED
FILTER RETAINERS
Fig. 11—Horizontal Filter Arrangement
→TABLE 4—FILTER RETAINER (IN.)
FURNACE
FILTER SIZE
CASING WIDTH
AND QUANTITY
14-3/16
(2) 16 X 20 X 1
17-1/2
(2) 16 X 20 X 1
21
(2) 16 X 20 X 1
24-1/2
(2) 16 X 20 X 1
INSTALLATION
POSITION
OF FILTERS
RETURN-AIR
PLENUM
ACCESS DOOR
Fig. 12—Downflow Filter Arrangement
D
4"
A82173
D
14-3/8
13-3/8
11-5/8
10-1/4
AIRFLOW
A88486
TABLE 5—MAXIMUM CAPACITY OF PIPE *
NOMINAL IRON
PIPE SIZE
(IN.)
1/2
3/4
1
1-1/4
1-1/2
* 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.
WARNING: Never purge a gas line into a combustion
chamber. Never use matches, candles, flame, or other
sources of ignition 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.)
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED)
SEDIMENT
TRAP
UNION
Fig. 13—Typical Gas Pipe Arrangement
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
—10—
INTERNAL
LENGTH OF PIPE (FT)
DIAMETER
10
20
30
(IN.)
0.622
175
120
97
0.824
360
250
200
1.049
680
465
375
1.380
1400
950
770
1.610
2100 1460 1180 990 900
40
50
82
73
170 151
320 285
660 580
A89414
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