Bryant 355CAV Instruction Manual download pdf (Page 41)

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 3 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 3 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 3 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 2 --- I n .

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 P i p e o r 3 --- I n .

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 Can a dian installations over 4500 ft (1370m) above sea level are subject to acceptance by the local authorities ha ving 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 table for each pipe, 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.

355CAV

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Bryant 355CAV Instruction Manual Page 41

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