Bryant 352mav Installation, Start-Up, And Operating Instructions Manual page 31

ALTITUDE (FT) UNIT SIZE
036060
036080
048080
8001 to 9000‡
048100
060100
060120
ALTITUDE (FT) UNIT SIZE
036060
036080
048080
9001 to 10,000‡
048100
060100
060120
Disk usage-Unless otherwise specified, use perforated disk assembly (factory-supplied in loose parts bag). If one disk is stated, separate 2 halves of perforated disk
assembly and use shouldered disk half. When using shouldered disk half, install screen side toward inlet box.
†Wide radius elbow.
‡Vent sizing for Canadian installations over 4500 ft (1370 m) above sea level are subject to acceptance by the local authorities having jurisdiction.
NA-Not Allowed; pressure switch will not make.
NOTES:
1. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
2. Size both the combustion-air and vent pipe independently, determine the smallest diameter allowed by the chart for each pipe, then use the larger of these two diameters
for both pipes.
3. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.
4. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
5. The minimum pipe length is 5 ft for all applications.
6. Use 3-in. diameter vent termination kit for installations requiring 4-in diameter pipe.
COMBUSTION – AIR
INTAKE HOUSING
3/8" ID TUBE
3/16"
DRILL
4"
MIN
TRAP
TO OPEN
DRAIN
Fig. 36—Intake Housing Plug Fitting Drain
NOTE: Shaded parts in Fig. 37, 38, 39, 40, and 41 are considered
to be termination. These components should NOT be counted
when determining pipe diameter. Roof termination is preferred
since it is less susceptible to damage, has reduced chances to take
in contaminants, and has less visible vent vapors. (See Fig. 37 or
39.) Sidewall termination may require sealing or shielding of
building surfaces with a corrosive resistance material due to
corrosive combustion products of vent system.
EXTENDED EXPOSED SIDEWALL PIPES
Sidewall combustion-air and vent pipe terminations may be
extended beyond area shown in Fig. 40 or 41 in outside ambient by
insulating pipes as indicated in Table 8.
1. Determine combustion-air and vent pipe diameters, as
stated above, using total pipe length and number of elbows.
TABLE 7—MAXIMUM ALLOWABLE PIPE LENGTH (FT) (CONTINUED)
TERMINATION
TYPE
2 Pipe or 2-in
Concentric
2 Pipe or 2-in
Concentric
2 Pipe or 3-in
Concentric
2 Pipe or 3-in.
Concentric
TERMINATION
TYPE
2 Pipe or 2-in
Concentric
2 Pipe or 2-in
Concentric
2 Pipe or 3-in
Concentric
2 Pipe or 3-in.
Concentric
BURNER
BOX
COMBUSTION –
AIR PIPE
A93035
PIPE DIA
(IN.)*
1 2
1-1/2 11 6
2 49 44
2 33 28
2-1/2 62 60
2-1/2 23 15
3 59 54
3† no disk 10 NA
4† no disk 35 30
PIPE DIA
(IN.)*
1 2
2 45 40
2 30 25
2-1/2 57 55
2-1/2 21 13
3 54 49
4† no disk 10 5
2. Using winter design temperature (used in load calculations),
find appropriate temperature for your application and fur-
nace model.
3. Determine required insulation thickness for exposed pipe
lengths.
NOTE: Pipe length(ft) specified for maximum pipe lengths lo-
cated in unconditioned spaces. Pipes located in unconditioned
space cannot exceed total allowable pipe length as specified in
Table 7.
TWO-PIPE TERMINATION KIT
1. Determine location for termination. Consideration of the
following should be made when determining an appropriate
location for termination kit.
a. Comply with all clearance requirements as stated in
Table 6.
b. Termination kit should be positioned where vent vapors
will not damage plants/shrubs or air conditioning equip-
ment.
c. Termination kit should be positioned so that it will not be
affected by wind eddy (such as inside building corners)
or allow recirculation of flue gases, airborne leaves, or
light snow.
d. Termination kit should be positioned where it will not be
damaged by or subjected to foreign objects, such as
stones, balls, etc.
e. Termination kit should be positioned where vent vapors
are not objectionable.
2. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size
being used.
—31—
NUMBER OF 90° ELBOWS
3 4 5
NA NA NA
42 37 35
17 12 10
58 56 55
7 5 NA
49 44 39
NA NA NA
25 20 15
NUMBER OF 90° ELBOWS
3 4 5
38 33 31
14 9 7
53 51 49
5 NA NA
44 39 34
NA NA NA
6
NA
34
NA
53
NA
34
NA
10
6
29
NA
47
NA
29
NA