Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual page 27

Table 6—Maximum Allowable Exposed Vent Pipe Length (Ft) With Insulation in Winter Design
WINTER
UNIT
DESIGN TEMPERA-
SIZE
TURE (°F)
040-14
060-14
080-14
→080-20
100-20
→120-20
* 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 5.
† Insulation thickness based on R value of 3.5 per in.
Combustion-air and vent pipes must terminate outside structure. A
factory accessory termination kit must be installed in 1 of the
installations shown in Fig. 31, 32, 33, 34, or 35. Four termination
kits are available.
1. The 2-in. termination bracket kit is for 1-in., 1-1/2 in., and
2-in. diameter 2-pipe termination systems.
2. The 3-in. termination bracket kit is for 2-1/2 in. and 3-in.
diameter 2-pipe termination systems.
3. The 2-in. concentric vent/air termination kit is for 1-in., 1-1/2
in., 2-in., and 2-1/2 in. diameter pipe systems when single
penetration of wall or roof is desired.
4. The 3-in. concentric vent/air termination kit is for 2-1/2 in. and
3-in. diameter pipe systems when single penetration of wall or
roof is desired.
NOTE: Shaded parts in Fig. 31, 32, 33, 34, and 35 are considered
to be terminations. These components should NOT be counted
when determining pipe diameter. Roof termination is preferred
since it is less susceptible to damage, has reduced chances to intake
contaminants, and has less visible vent vapors. (See Fig. 31 or 32.)
Sidewall termination may require sealing or shielding of building
surfaces with a corrosive resistance material due to corrosive
combustion products of vent system.
EXTENDED EXPOSED SIDEWALL PIPES
Sidewall combustion-air and vent pipe terminations may be
extended beyond area shown in Fig. 34 or 35 in outside ambient by
insulating pipes as indicated in Table 6.
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 cannot exceed total allowable pipe
length as specified in Table 5.
TWO-PIPE TERMINATION KIT
1. Determine location for termination.
Temperature Ambient*
MAXIMUM PIPE
DIAMETER
20 2
0 2
-20 2
20 2
0 2
-20 2
20 2
0 2
-20 2
20 2-1/2
0 2-1/2
-20 2-1/2
20 3
0 3
-20 3
INSULATION THICKNESS (IN.)†
0 3/8
21 37
10 22
5 14
30 55
16 33
9 23
37 65
20 39
11 27
41 70
21 42
11 28
49 70
26 51
15 35
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
4.
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 it will not be
affected by wind eddy (such as inside building corners) or
accumulation of airborne leaves or light snow, or allow
recirculation of flue gases.
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. 31.
For applications using combustion-air pipe option, indicated
by dashed lines in Fig. 31, 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. 34 or
35.
For applications using vent pipe option indicated by dashed
lines in Fig. 34, rotate vent elbow 90° from position shown in
Fig. 34.
4. Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping.
5. Check required dimensions as shown in Fig. 31, 34, or 35.
CONCENTRIC VENT/AIR TERMINATION KIT
1. Determine location for termination.
Consideration of the following should be made when deter-
mining an appropriate location for termination kit.
27
1/2 3/4 1
42 50 57
25 30 35
17 21 25
61 70 70
38 46 53
26 33 38
70 70 70
45 55 63
31 39 45
70 70 70
48 59 68
33 41 49
70 70 70
58 70 70
40 50 59