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21-IN. (533mm) WIDE
⁄
1
17
-IN. (444mm) WIDE
CASINGS ONLY:
2
CASINGS ONLY:
SUPPORT RODS (3)
INSTALL FIELD-SUPPLIED
EXTEND 1/4" (6mm) ON
FILTER FILLER STRIP
EACH SIDE OF FILTER AND
UNDER FILTER.
REST ON CASING FLANGE
3 "
(76mm)
"
1
24
/
2
(533mm)
1 "
(25.4mm)
FILTER
SUPPORT
Bottom Filter Arrangement
Fig. 27 - -
FRONT FILLER
PANEL
Fig. 28 - - Removing Bottom Closure Panel
WASHABLE
FILTER
FILTER
RETAINER
A00290
BOTTOM
CLOSURE
PANEL
A93047
- - 26 - -
Table 5 – Maximum Capacity of Pipe*
NOMINAL
INTERNAL
IRON PIPE
DIA.
10
SIZE
IN. (MM)
(3.0)
IN. (MM)
0.622
175
1/2 (12.7)
(158)
0.824
360
3/4 (19.0)
(20.9)
1.049
680
1 (25.4)
(26.6)
1.380
1-1/4
1400
(35.0)
(31.8)
1.610
1-1/2
2100
(40.9)
(38.1)
* 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 9.2 NFGC.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
-Connect gas pipe to furnace using a backup wrench to avoid
damaging gas controls.
-Gas valve shutoff switch MUST be facing forward or
tilted upward.
-Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of
leaks to check all connections.
-Use proper length of pipe to avoid stress on gas
control manifold.
-If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at furnace
gas valve and extend a minimum of 2 in. (51 mm) outside
furnace casing.
-Protect gas valve from water and debris. Gas valve inlet
and/or inlet piping must remain capped until gas supply line is
permanently installed to protect the valve from moisture and
debris. Also, install a sediment trap in the gas supply piping at
the inlet to the gas valve.
Install a sediment trap in riser leading to furnace. Trap can be
installed by connecting a tee to riser leading to furnace so
straight-through section of tee is vertical. Then connect a capped
nipple into lower end of tee. Capped nipple should extend below
level of gas controls. Place a ground joint union between gas
control manifold and manual gas shutoff valve. (See Fig. 29.)
If local codes allow the use of a flexible gas appliance connector,
always use a new listed connector. Do not use a connector which
has previously served another gas appliance.
LENGTH OF PIPE --- FT (M)
20
30
40
50
(6.0)
(9.1)
(12.1)
(15.2)
120
97
82
73
250
200
170
151
465
375
320
285
950
770
660
580
1460
1180
990
900
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