Bryant 350MAV Installation, Start-Up, And Operating Instructions Manual page 26

ALTITUDE UNIT SIZE
024040
036040
024060
036060
048060
036080
048080
8001 to 9000‡
060080
048100
060100
→060120
→060140
ALTITUDE UNIT SIZE
024040
036040
024060
036060
048060
036080
048080
9001 to 10,000‡
060080
048100
060100
→060120
→060140
* 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, then use the larger diameter 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. 30—Intake Housing Plug Fitting Drain
WARNING: Inducer housing outlet cap must be in-
stalled and fully seated against inducer housing. Clamp
must be tightened to prevent any condensate leakage.
Failure to follow this warning could result in electrical
shock, fire, personal injury, or death.
c. Install pipe support (factory-supplied in loose parts bag)
into selected furnace casing vent pipe hole. Pipe support
should be positioned at bottom of casing hole.
TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
TERMINATION
TYPE
2 Pipe or 2-In.
Concentric
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 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
1-1/2 46
2 62
1-1/2 11
2 49
2 33
2-1/2 62
2-1/2 23
3 59
3† no disk 10 NA
4† no disk 35
NA
PIPE DIA
(IN.)*
1
1-1/2 42
2 57
2 45
2 30
2-1/2 57
2-1/2 21
3 54
4† no disk 10
NA
d. Insert 2-in. diameter pipe into inducer housing through
neoprene coupling and clamp in inducer housing.
Tighten clamp.
WARNING: Vent pipe must be installed and fully
seated against inducer housing. Clamp must be tightened
to prevent any condensate leakage. Failure to follow this
warning could result in electrical shock, fire, personal
injury, or death.
NOTE: A 2-in. diameter pipe must be used within the furnace
casing. Make all pipe diameter transitions outside furnace casing.
VENT EXTENSION PIPE
→
Furnaces with 100,000 Btuh and larger inputs are supplied
with a PVC vent extension pipe (2-in. diameter by 12-in.
long). This pipe has a built-in channel to assist vent
condensate disposal. When this vent extension pipe is
supplied, it must be used to connect the field vent pipe to
furnace inducer housing on ALL upflow and downflow
applications.
NOTE: See label on vent extension pipe for proper installation.
This pipe may be shortened if an elbow is used to connect vent
extension tube to field-installed vent pipe.
3. Working from furnace to outside, cut pipe to required
length(s).
4. Deburr inside and outside of pipe.
—26—
Continued
NUMBER OF 90° ELBOWS
2 3 4
41 36 31 29
60 58 56 55
6 NA NA NA
44 42 37 35
28 17 12 10
60 58 56 55
15 7 5 NA
54 49 44 39
NA NA NA
30 25 20 15
NUMBER OF 90° ELBOWS
2 3 4
37 32 27 25
55 53 51 49
40 38 33 31
25 14 9
55 53 51 49
13 5 NA NA
49 44 39 34
5 NA NA NA
5 6
24
53
NA
34
NA
53
NA
34
NA
10
5 6
20
47
29
7 NA
47
NA
29
NA