Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 29

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.
1. Determine combustion-air and vent pipe diameters, as stated
above, using total pipe length and number of elbows.
2. Using winter design temperature (used in load calculations),
find appropriate temperature for your application and furnace
model.
3. Determine required insulation thickness for exposed pipe
lengths.
NOTE: Pipe length (ft) specified for maximum pipe lengths
located in unconditioned spaces. Pipes located in unconditioned
space cannot exceed total allowable pipe length as specified in
Table 7.
Two-Pipe Termination Kit
1. Determine location for termination.
Consideration of the following should be made when deter-
mining an appropriate location for termination kit.
a. Comply with all clearance requirements as stated in Table
5.
b. Termination kit should be positioned where vent vapors
will not damage plants/shrubs or air conditioning equip-
ment.
c. Termination kit should be positioned so that it will not be
affected by wind eddy (such as inside building corners) or
allow recirculation of flue gases, airborne leaves, or light
snow.
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
NUMBER OF 90° ELBOWS
PIPE DIA
(IN.)*
1 2
1-1/2 46 41
2 62 60
1-1/2 11 6
2 49 44
2 33 28
2-1/2 62 60
2-1/2 23 15
3 59 54
3† no disk 10 NA
4† no disk 35 30
NA
PIPE DIA
(IN.)*
1 2
1-1/2 42 37
2 57 55
2 45 40
2 30 25
2-1/2 57 55
2-1/2 21 13
3 54 49
4† no disk 10 5
NA
d. Termination kit should be positioned where it will not be
damaged by or subjected to foreign objects, such as stones,
balls, etc.
e. Termination kit should be positioned where vent vapors are
not objectionable.
2. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size
being used.
3. Loosely install elbow in bracket and place assembly on
combustion-air pipe.
Roof terminations—Loosely install pipe coupling on prop-
erly cut vent pipe. Coupling must be positioned so bracket will
mount as shown in Fig. 36.
For applications using combustion-air pipe option, indicated
by dashed lines in Fig. 36, install 90° street elbow into 90°
elbow, making U-fitting. A 180° U-fitting may be used.
Sidewall terminations—Install bracket as shown in Fig. 39 or
40.
For applications using vent pipe option indicated by dashed
lines in Fig. 39, rotate vent elbow 90° from position shown in
Fig. 39.
4. Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping.
5. Check required dimensions as shown in Fig. 36, 39, or 40.
29
3 4 5
36 31 29
58 56 55
NA NA NA
42 37 35
17 12 10
58 56 55
7 5 NA
49 44 39
NA NA NA
25 20 15
NUMBER OF 90° ELBOWS
3 4 5
32 27 25
53 51 49
38 33 31
14 9 7
53 51 49
5 NA NA
44 39 34
NA NA NA
6
24
53
NA
34
NA
53
NA
34
NA
10
6
20
47
29
NA
47
NA
29
NA