Bryant Gas 340MAV User Manual

Page 18

VI.

BOTTOM CLOSURE PANEL

These furnaces are shipped with bottom enclosure panel installed
in bottom return-air opening. This panel MUST be in place when
side return air is used.

To remove bottom closure panel, perform following:

1. Tilt or raise furnace and remove 2 screws holding front

filler panel. (See Fig. 25.)

2. Rotate front filler panel downward to release holding tabs.

3. Remove bottom closure panel.

4. Reinstall front filler panel and screws.

VII.

GAS PIPING

Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the United States.
Canadian installations must be made in accordance with NSCNG-
PIC and all authorities having jurisdiction. Gas supply line should
be a separate line running directly from meter to furnace, if
possible. Refer to Table 3 for recommended gas pipe sizing. Risers
must be used to connect to furnace and to meter. Support all gas
piping with appropriate straps, hangers, etc. Use a minimum of 1
hanger every 6 ft. Joint compound (pipe dope) should be applied
sparingly and only to male threads of joints. Pipe dope must be
resistant to propane gas.

CAUTION:

Connect gas pipe to furnace using a backup

wrench to avoid damaging gas controls. Failure to follow
this caution will result in intermittent unit operation or
performance satisfaction.

WARNING:

Gas valve shutoff switch MUST be facing

forward or tilted upward. Failure to follow this warning
could result in property damage or death.

WARNING:

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. A
failure to follow this warning could result in fire, explo-
sion, personal injury, or death.

WARNING:

Use proper length of pipe to avoid stress on

gas control manifold. Failure to follow this warning could
result in a gas leak resulting in fire, explosion, personal
injury, or death.

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. 26.)

Fig. 24—Bottom Filter Arrangement

A00290

WASHABLE
FILTER

FILTER
SUPPORT

FILTER
RETAINER

⁄

-IN. WIDE

CASINGS ONLY:
INSTALL FIELD-SUPPLIED
FILTER FILLER STRIP
UNDER FILTER.

″

21-IN. WIDE
CASINGS ONLY:
SUPPORT RODS (3)
EXTEND 1/4" ON EACH
SIDE OF FILTER AND
REST ON CASING FLANGE

Fig. 25—Removing Bottom Closure Panel

A93047

BOTTOM
CLOSURE
PANEL

FRONT FILLER
PANEL

TABLE 3—MAXIMUM CAPACITY OF PIPE*

NOMINAL

IRON

PIPE
SIZE

(IN.)

INTERNAL

DIAMETER

(IN.)

LENGTH OF PIPE (FT)

1/2

0.622

175

120

3/4

0.824

360

250

200

170

151

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 12.2 NFPA 54-2002.

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