Carrier 58MTB User Manual download pdf (Page 16)

58MTB

MAXIMUM ALLOWABLE PIPE LENGTH (FT) (Continued)

ALTITUDE (FT)

UNIT SIZE

(BTUH)

DIRECT VENT (2-PIPE) ONLY

NON-DIRECT VENT

(1-PIPE) ONLY

NUMBER OF 90° ELBOWS

TERMINATION

TYPE

PIPE DIA

(IN.)*

PIPE DIA

(IN.)*

12 3 4 5 6

7001 to 8000‡

60,000

2 Pipe or 2-in

Concentric

1-1/2 1-1/2 12 7 NA NA NA NA

2253 48 46 41 40 38

80,000

2 Pipe or 2-in

Concentric

2236 31191412NA

2-1/2 2-1/2 66 65 63 62 60 59

100,000

2 Pipe or 3-in

Concentric

2-1/2 2-1/2 25 17 8 7NANA

3363 58 53 48 4338

120,000

2Pipeor3-in.

Concentric

3†nodiskNA2013 7NANANA

NA 3†464443 41 40 38

4† no disk4†nodisk615651464136

ALTITUDE (FT)

UNIT SIZE

(BTUH)

DIRECT VENT (2-PIPE) ONLY

NON-DIRECT VENT

(1-PIPE) ONLY

NUMBER OF 90° ELBOWS

TERMINATION

TYPE

PIPE DIA

(IN.)*

PIPE DIA

(IN.)*

12 3 4 5 6

8001 to 9000‡

60,000

2 Pipe or 2-in

Concentric

1-1/2 1-1/2 11 6 NA NA NA NA

224944423

7 35 34

80,000

2Pipeor2-in

Concentric

2233 28 17 12 10 NA

2-1/2 2-1/2 62 60 58 56 55 53

100,000

2Pipeor3-in

Concentric

2-1/2 2-1/2 23 15 7 5 NA NA

3359 54 49 44 39 34

120,000

2Pipeor3-in.

Concentric

3†nodisk NA 10NANANANANA

NA 3†43 41 39 37 35 34

4† no disk4†nodisk 35 3025201510

ALTITUDE (FT)

UNIT SIZE

(BTUH)

DIRECT VENT (2-PIPE) ONLY

NON-DIRECT VENT

(1-PIPE) ONLY

NUMBER OF 90° ELBOWS

TERMINATION

TYPE

PIPE DIA

(IN.)*

PIPE DIA

(IN.)*

12 3 4 5 6

9001 to 10,000‡

60,000

2Pipeor2-in

Concentric

22454038 33 3129

80,000

2Pipeor2-in

Concentric

223025 14 9 7 NA

2-1/2 2-1/2 57 55 53 51 49 47

100,000

2Pipeor3-in

Concentric

2-1/2 2-1/2 21 13

5 NANANA

3354 49 44 39 3429

120,000

2Pipeor3-in.

Concentric

NA 3† 39 37 35 33 3129

4† no disk4†nodisk 10 5 NA NA NA NA

*Disk usage-Unless otherwise specified, use perforated disk assembly (factory-supplied in loosepartsbag).Ifonediskisstated, separate 2 halves of perforated dis

assembly and use shouldered diskhalf. When using shouldered diskhalf, install screen side toward inlet box.

†Wide radius elbow.

‡Vent sizing for Canadianinstallations over 4500 ft (1370 m) above sea level are subject to acceptance bythelocal authorities having jurisdiction.

NA-Not Allowed; pressure switch will not make.

NOTES:

1. Do not us

e pipe size greater thanthose specified in table or incomplete combustion, flame disturbance, or flame senselockoutmay occur.

2. Size both the combustion-air and vent pipe independently, then usethelarger diameter for both pipes.

3.Assume two 45° elbows equal one 90° elbow.Wideradius elbowsare desirable and may berequired in some cases.

4. Elbowsand pipe section

s within the furnace casing and at the vent termination should not beincluded in vent length or elbow count.

5. The minimum pipe length is 5ftforall applications.

6. Use 3-in. diameter vent termination kit for installations requiring 4-in diameter pipe.

Combustion-air and vent piping for Direct Vent (2-Pipe)

and Non-Direct Vent (1-Pipe) Applications

1 ... 15 16 17 18 19 20 21 22

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