U.S. Boiler Company Alpine ALP500C, Installation, Operating And Service Instructions

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iV. Venting
B. CPVC/PVC Venting (continued)
• PVC vent pipe may not be used
to penetrate combustible or non-
combustible walls unless all following
three conditions are met simultaneously
(see Figure 15):
- The wall penetration is at least 66
in. (1680 mm) from the boiler as
measured along the vent
- The wall is 12 in. (300 mm) thick or
less
- An air space of at least of that shown
in Figure 15 is maintained around
outside of the vent pipe to provide
air circulation
• If above three conditions cannot be
met simultaneously when penetrating
a combustible wall, use CPVC pipe for
wall penetration.
• Size and cut wall opening such that
a minimal clearance is obtained and
to allow easy insertion of vent pipe.
Figure 15: Wall Penetration Clearances
for PVC Vent Pipe
Wall thimbles for CPVC/PVC pipe are
available from U.S. Boiler Company:
P/N’s 102180-01 (3 in.), 102181-01 (4
in.), 103419-01(6 in.).
• Apply sealant between vent pipe and wall
opening to provide weather-tight seal.
Sealant should not restrain the expansion
of the vent pipe.
• Install contractor provided optional trim
plate on wall outside surface to cover
wall opening (see Figure 15).
• Secure trim plate to wall with nails or
screws and seal ID and plate OD or
perimeter with sealant material.
nominal
Pipe
Dia. (in.)
Length of
Straight run
Loop Length
“L”
ft. m in. mm
3
20
6.1
53
1350
30
9.1
65
1650
40
12
75
1900
50
15
84
2130
60
18
92
2340
4
20 6.1 60 1520
30 9.1 74 1880
40 12 85 2159
50 15 95 2413
60 18 104 2642
6
20 6.1 73 1850
30 9.1 90 2290
40 12 103 2620
50 15 116 2950
60 18 127 3230
Table 15: Expansion Loop Lengths
Figure 14: CPVC/PVC Expansion Loop and Offset