Gas Piping - Bryant 352MAV Installation, Start-Up, And Operating Instructions Manual

⁄
1
17 -IN. WIDE
2
CASINGS ONLY:
INSTALL FIELD-SUPPLIED
FILTER FILLER STRIP
UNDER FILTER.
3 "
"
1
24 /
2
1 "
FILTER
SUPPORT
Fig. 24—Bottom Filter Arrangement
FRONT FILLER
PANEL
Fig. 25—Removing Bottom Closure Panel
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.
WASHABLE
FILTER
FILTER
RETAINER
A00213
BOTTOM
CLOSURE
PANEL
A93047
—18—
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.
TABLE 3—MAXIMUM CAPACITY OF PIPE*
NOMINAL
IRON INTERNAL
PIPE DIAMETER
SIZE (IN.)
(IN.)
1/2 0.622
3/4 0.824
1 1.049
1-1/4 1.380
1-1/2 1.610
* 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: NFGC.
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.
WARNING: Gas valve shutoff switch MUST be facing
forward or tilted upward. Failure to follow this warning
could result in property damage or death.
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WARNING: Never purge a gas line into a combustion
chamber. Use a commercially available soap solution
made specifically for the detection of leaks to check all
connections, as specified in "Adjustments" section. Fail-
ure to follow this warning could result in fire, explosion,
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.)
CAUTION: If a flexible connector is required or al-
lowed by authority having jurisdiction, black iron pipe
shall be installed at gas valve and extend a minimum of
2 in. outside furnace casing.
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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 serviced another gas appliance.
LENGTH OF PIPE (FT)
10 20 30 40
175 120 97 82
360 250 200 170
680 465 375 320
1400 950 770 660
2100 1460 1180 990
50
73
151
285
580
900