Bryant 355CAV Furnace User Manual


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Table 9 — Maximum Allowable Pipe Length (Ft / M) (Continued)
ALTITUDE
UNIT SIZE
(BTUH)
Direct Vent (2--Pipe Only)
NUMBER OF 90_ ELBOWS
Termination
Type
Pipe Dia
(IN.)*
1 2 3 4 5 6
6001 to 7000‡
60,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 35 / 10.7 30 / 9.1 25 / 7.6 20 / 6.1 15 / 4.6 10 / 3.0
2 70 / 21.3 70 / 21.3 68 / 20.7 67 / 20.4 66 / 20.11 64 / 19.5
80,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 20 / 6.1 15 / 4.6 10 / 3.0 5/1.5 NA NA
2 70 / 21.3 70 / 21.3 68 / 20.7 67 / 20.4 62 / 18.9 57 / 17.4
100,000
2 Pipe or 2 --- In.
Concentric
2 31 / 9.4 26 / 7.9 21 / 6.4 16 / 4.9 11 / 3.4 6/1.8
2 --- 1/2 70 / 21.3 70 / 21.3 68 / 20.7 67 / 20.4 66 / 20.1 64 / 19.5
120,000
2 Pipe or 3 --- In.
Concentric
3onedisk† 49 / 14.9 48 / 14.6 47 / 14.3 45 / 13.7 44 / 13.4 43 / 13.1
ALTITUDE
UNIT SIZE
(BTUH)
Termination
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
7001 to 8000‡
60,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 32 / 9.8 27 / 8.2 22 / 6.7 17 / 5.2 12 / 3.7 7/2.1
2 66 /20.1 65 / 19.8 63 / 19.2 62 / 18.9 60 / 18.3 59 / 18.0
80,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 18 / 5.5 13 / 4.0 8/2.4 NA NA NA
2 66 / 20.1 65 / 19.8 63 / 19.2 62 / 18.9 57 / 17.4 52 / 15.8
100,000
2 Pipe or 2 --- In.
Concentric
2 29 / 8.8 24 / 7.3 19 / 5.8 14 / 4.3 9/2.7 NA
2 --- 1/2 66 / 20.1 65 / 19.8 63 / 19.2 62 / 18.9 60 / 18.3 59 / 18
120,000
2 Pipe or 3 --- In.
Concentric
3onedisk† 46 / 14.0 44 / 13.4 43 / 13.1 41 / 12.5 40 / 12.2 38 / 11.6
ALTITUDE
UNIT SIZE
(BTUH)
Termination
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
8001 to 9000‡
60,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 30 / 9.1 25 / 7.6 20 / 6.1 15 / 4.6 10 / 3.0 5/1.5
2 62 / 18.9 60 / 17.8 58 / 17.7 56 / 17.1 55 / 16.8 53 / 16.2
80,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 17 / 5.2 12 / 3.1 7/2.1 NA NA NA
2 62 / 18.9 60 / 18.3 58 / 17.7 56 / 17.1 51 / 15.5 46 / 14.0
100,000
2 Pipe or 2 --- In.
Concentric
2 27 / 8.2 22 / 6.7 17 / 5.2 12 / 3.7 7/2.1 NA
2 --- 1/2 62 / 18.9 60 / 18.3 58 / 17.7 56 / 17.1 55 / 16.8 53 / 16.2
120,000
2 Pipe or 3 --- In.
Concentric
3onedisk† 43 / 13.1 41 / 12.5 39 /11.9 37 / 11.3 35 / 10.7 34 / 10.4
ALTITUDE
UNIT SIZE
(BTUH)
Termination
Type
Pipe Dia
(IN.)*
NUMBER OF 90_ ELBOWS
1 2 3 4 5 6
9001 to
10000‡
60,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 27 / 8.2 22 / 6.7 17 / 5.2 12 / 3.7 7/2.1 NA
2 57 / 17.4 55 / 16.8 53 / 16.2 51 / 15.5 49 / 14.9 47 / 14.3
80,000
2 Pipe or 2 --- In.
Concentric
1 --- 1/2 15 / 4.6 10 / 3.0 5/1.5 NA NA NA
2 57 / 17.4 55 / 16.8 53 / 16.2 51 / 15.5 46 / 14.0 41 / 12.5
100,000
2 Pipe or 2 --- In.
Concentric
2 24 / 7.3 19 / 5.8 14 / 4.3 9/2.7 NA NA
2 --- 1/2 57 / 17.4 55 / 16.8 53 / 16.2 51 / 15.5 49 / 14.9 47 / 14.3
120,000
2 Pipe or 3 --- In.
Concentric
3onedisk† 39 / 11.9 37 / 11.3 35 / 10.7 33 / 10.1 31 / 9.5 29 / 8.8
* Disk usage---Unless otherwise stated, use perforated disk assembly (factory---supplied in loose parts bag).
{ Wide radius elbow.
} Vent sizing for C a nadian installations over 4500 ft (1370m) above sea level are subject to a cceptance by the local a uthorities having ju risdiction .
NA---Not Allowed; pressure switch will not make.
NOTES:
1. Do not usepipe size greater than those specifiedin table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
2.Sizeboththecombustion---airandventpipeindependently,determinethesmallestdiameterallowedbythe tablefor eachpipe,thenusethelargerdiameterf or bothpipes.
3. Assume two 45_ elbows equal one 90_ elbow . Long radius elbows are desirable and may be required in some cases.
4. Elbowsand pipe sectionswithin the furnace casing andat the vent termination should notbe included in vent length or elbow count.
5. The minimum pipe length is 5 ft for all applications.
355CAV
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