Carrier 58MTB - VENT PIPE LENGTH AND INSTALLATION; Pipe Sizing and Installation Guidelines

UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
Vent pipe must be installed and fully seated against inducer
housing internal stop. Clamp must be tightened to prevent any
condensate leakage.
6. Install casing hole filler cap (factory-supplied in loose parts
bag) in unused vent pipe casing hole.
Attachment of Vent Extension Pipe
Furnaces with 100,000 Btuh and larger input 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.
Installation Guidelines for Combustion Air Pipe and Vent Pipe
It is recommended that all pipes be cut, prepared, and pre-
assembled before permanently cementing any joint.
1. Attach combustion air pipe and vent pipe per instructions in
sections ″Combustion Air Pipe″ and ″Vent Pipe.″
2. Working from furnace to outside, cut pipe to required
length(s).
3. Deburr inside and outside of pipe.
4. Chamfer outside edge of pipe for better distribution of primer
and cement.
TABLE 12—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE (FT)
UNIT MAX
INPUT RATE
(BTUH)
DIRECT VENT (2-PIPE) ONLY
NON-DIRECT VENT
(1-PIPE) ONLY
NUMBER OF 90° ELBOWS
TERMINATION
TYPE
PIPE DIA
(IN.)*
PIPE DIA
(IN.)*
123456
0 to 2000
60,000
2 Pipe or 2-in
Concentric
1-1/2 1-1/2 20 15 10 5 NA NA
2 2 70 70 70 70 70 70
80,000
2 Pipe or 2-in
Concentric
1-1/2 1-1/2 10 NA NA NA NA NA
2 2 55 50 35 30 30 20
2-1/2 2-1/2 70 70 70 70 70 70
100,000
2 Pipe or 3-in
Concentric
2 2 5 NANANANANA
2-1/2 2-1/2 40 30 20 20 10 NA
3 3 70 70 70 70 70 70
120,000
2 Pipe or 3-in.
Concentric
2-1/2 one disk 2-1/2 10 NA NA NA NA NA
3† NA 45 40 35 30 25 20
3† no disk 3† 70 70 70 70 70 70
ALTITUDE (FT)
UNIT MAX
INPUT RATE
(BTUH)
DIRECT VENT (2-PIPE) ONLY
NON-DIRECT VENT
(1-PIPE) ONLY
NUMBER OF 90° ELBOWS
TERMINATION
TYPE
PIPE DIA
(IN.)*
PIPE DIA
(IN.)*
123456
2001 to 3000
60,000
2 Pipe or 2-in
Concentric
1-1/2 1-1/2 17 12 7 NA NA NA
2 2 70 67 66 61 61 61
80,000
2 Pipe or 2-in
Concentric
2 2 49 44 30 25 25 15
2-1/2 2-1/2 70 70 70 70 70 70
100,000
2 Pipe or 3-in
Concentric
2-1/2 2-1/2 35 26 16 16 6 NA
3 3 70 70 70 70 66 61
120,000
2 Pipe or 3-in.
Concentric
3 NA 14 9 NA NA NA NA
NA 3† 63 62 62 61 61 61
3† no disk NA 70 70 63 56 50 43
4† no disk 4† no disk 70 70 70 70 70 70
ALTITUDE (FT)
UNIT MAX
INPUT RATE
(BTUH)
DIRECT VENT (2-PIPE) ONLY
NON-DIRECT VENT
(1-PIPE) ONLY
NUMBER OF 90° ELBOWS
TERMINATION
TYPE
PIPE DIA
(IN)*
PIPE DIA
(IN.)*
123456
3001 to 4000
60,000
2 Pipe or 2-in
Concentric
1-1/2 1-1/2 16 11 6 NA NA NA
2 2 68 63 62 57 57 56
80,000
2 Pipe or 2-in
Concentric
2 2 46 41 28 23 22 13
2-1/2 2-1/2 70 70 70 70 70 70
100,000
2 Pipe or 3-in
Concentric
2-1/2 2-1/2 33 24 15 14 5 NA
3 3 70 70 70 66 61 56
120,000
2 Pipe or 3-in.
Concentric
3† no disk NA 65 58 51 44 38 31
NA 3† 59 59 58 57 57 56
4† no disk 4† no disk 4† no disk 70 70 70 70 70 70
See notes at end of table
36