Carrier 58MVP080 Installation, Start-Up, And Operating Instructions Manual page 30

Table 7—Maximum Allowable Exposed Vent Pipe Length (Ft) With Insulation in Winter Design
WINTER DESIGN
UNIT
TEMPERATURE
SIZE
(°F)
20
040-14 0
-20
20
060-14 0
-20
20
080-14
0
080-20
-20
20
100-20 0
-20
20
120-20 0
-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 6.
† Insulation thickness based on R value of 3.5 per in.
NOTE: Shaded parts in Fig. 33, 34, 35, 36, and 37 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. 33 or 34.)
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. 36 or 37 in outside ambient by
insulating pipes as indicated in Table 7.
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 6.
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 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.
Temperature Ambient*
MAXIMUM PIPE
DIAMETER
0
(IN.)
2 21
2 10
2 5
2 30
2 16
2 9
2 37
2 20
2 11
2-1/2 41
2-1/2 21
2-1/2 11
3 49
3 26
3 15
2. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size
3. Loosely install elbow in bracket and place assembly on
4. Disassemble loose pipe fittings. Clean and cement using same
5. Check required dimensions as shown in Fig. 33, 36, or 37.
CONCENTRIC VENT/AIR TERMINATION KIT
1. Determine location for termination.
30
INSULATION THICKNESS (IN.)†
3/8 1/2
37 42
22 25
14 17
55 61
33 38
23 26
65 70
39 45
27 31
70 70
42 48
28 33
70 70
51 58
35 40
e. Termination kit should be positioned where vent vapors are
not objectionable.
being used.
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. 33.
For applications using combustion-air pipe option indicated
by dashed lines in Fig. 33, 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. 36 or
37.
For applications using vent pipe option indicated by dashed
lines in Fig. 36, rotate vent elbow 90° from position shown in
Fig. 36.
procedures as used for system piping.
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 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.
3/4 1
50 57
30 35
21 25
70 70
46 53
33 38
70 70
55 63
39 45
70 70
59 68
41 49
70 70
70 70
50 59