WARNING:
Caution should be taken to prevent drain-
ing where slippery conditions may cause personal inju-
ries. Excessive condensate draining may cause saturated
soil conditions which may result in damage to plants.
C.
Condensate Drain Protection
Freezing condensate left in condensate trap and drain line may
cause cracks, and possible water damage may occur. If freeze
protection is required, use condensate freeze protection accessory
TABLE 8—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION IN WINTER
DESIGN TEMPERATURE AMBIENT*
UNIT
SIZE
WINTER DESIGN
TEMPERATURE
(°F)
MAX PIPE
DIAMETER
(IN.)
WITHOUT
INSULATION
WITH 3/8–IN. OR
THICKER INSULATION†
040
20
1.5
51
70
0
1.5
28
70
-20
1.5
16
70
20
2
45
70
0
2
22
70
-20
2
10
58
060
20
2
65
70
0
2
35
70
-20
2
20
70
080
20
2
55
55
0
2
48
55
-20
2
30
55
20
2.5
70
70
0
2.5
47
70
-20
2.5
28
70
100
20
2.5
40
40
0
2.5
40
40
-20
2.5
38
40
20
3
70
70
0
3
50
70
-20
3
28
70
120
20
3
70
70
0
3
61
70
-20
3
37
70
20
4
70
70
0
4
48
70
-20
4
23
70
140
20
3
60
60
0
3
60
60
-20
3
44
60
20
4
70
70
0
4
57
70
-20
4
30
70
* 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.
† Insulation thickness based on R value of 3.5 per in.
Fig. 41—Rooftop Termination (Dimension “A” is Touch-
ing or 2-in. Maximum Separation)
A96128
A
Fig. 42—Concentric Vent and Combustion-Air Roof
Termination (Dimension “A” is Touching or 2-in.
Maximum Separation)
A93056
COMBUSTION
AIR
VENT
VENT
A
—33—
Summary of Contents for CONDENSING GAS FURNACE 350MAV
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