Carrier 58MXA 170 Series Installation, Start-Up, And Operating Instructions Manual page 32

ALTITUDE (FT) UNIT SIZE
040-08
040-12
060-08
060-12
060-16
080-12
080-16
8001 to 9000‡
080-20
100-16
100-20
120-20
140-20
ALTITUDE (FT) UNIT SIZE
040-08
040-12
060-08
060-12
060-16
080-12
080-16
9001 to 10,000‡
080-20
100-16
100-20
120-20
140-20
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.
VERTICAL SEPARATION
BETWEEN COMBUSTION
CLEARANCE ABOVE HIGHEST
MAXIMUM OF 24 IN. ABOVE ROOF.
e. Termination kit should be positioned where vent vapors are
not objectionable.
2. Cut one 4-in. diameter hole for 2-in. kit, or one 5-in. diameter
hole for 3-in. kit.
Table 7—Maximum Allowable Pipe Length (ft) (Continued)
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
AIR AND VENT
8 3 / 4 " FOR 3" KIT
6 3 / 4 " FOR 2" KIT
MAINTAIN 12 IN. MINIMUM
ANTICIPATED SNOW LEVEL.
Fig. 36—Roof Termination (Preferred)
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
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
ROOF
18" MAXIMUM
BRACKET
COUPLING
VENT
3. Loosely assemble concentric vent/air termination components
together using instructions in kit.
4. Slide assembled kit with rain shield REMOVED through hole.
32
NUMBER OF 90° ELBOWS
2 3 4
41 36 31
60 58 56
6 NA NA
44 42 37
28 17 12
60 58 56
15 7 5
54 49 44
NA NA NA
30 25 20
NUMBER OF 90° ELBOWS
2 3 4
37 32 27
55 53 51
40 38 33
25 14 9
55 53 51
13 5 NA
49 44 39
5 NA NA
COMBUSTION
AIR
5 6
29 24
55 53
NA NA
35 34
10 NA
55 53
NA NA
39 34
NA NA
15 10
5 6
25 20
49 47
31 29
7 NA
49 47
NA NA
34 29
NA NA
A87224