Install Instructions

103448-08 - 9/16 33
IV. Venting B. CPVC/PVC Venting (continued)
ii. Combustion Air Piping
• Size combustion air pipe wall penetration
opening to allow easy insertion of the pipe.
• Install rodent screen and combustion air
terminal (supplied with boiler). See Figure
13 for appropriate conguration details.
• Apply sealant between combustion air pipe
and wall opening to provide weather-tight
seal.
b. Optional Two-Pipe Snorkel Termination, see
Figures 6A and 6B.
This installation will allow a maximum of 7
ft. (2.1 m) vertical exterior run of the vent/
combustion air piping to be installed on the
CPVC/PVC horizontal venting application.
NOTICE
Exterior run to be included in equivalent vent/
combustion air lengths.
i. Vent Piping
• After penetrating wall, install a Schedule
40 PVC 90° elbow so that the elbow leg is
in the up direction.
• Install maximum vertical run of 7 ft.
(2.1 m) of Schedule 40 PVC vent pipe.
See Figure 6A.
• Install another PVC 90° elbow at top
of vent pipe length so that elbow leg is
opposite the building’s exterior surface.
• Install rodent screen and vent terminal
(supplied with boiler, see Figure 13 for
appropriate conguration.
• Brace exterior piping if required.
ii. Combustion Air Piping
• After penetrating wall, install a Schedule
40 PVC 90° elbow so that elbow leg is in
the up direction.
• Install maximum vertical run of 7 ft. (2.1
m) of Schedule 40 PVC air pipe. See
Figure 6B.
• Install another PVC 90° elbow at top of air
pipe length so that elbow leg is opposite
the building’s exterior surface.
• Install rodent screen and combustion air
terminal (supplied with boiler). See Figure
13 for appropriate conguration.
1. The wall penetration is 66 in. (1680 mm)
or more, measured along the vent from
the end of the CPVC pipe at the boiler
vent connection to the wall.
2. The wall is 12 in. (300 mm) thick or
less.
3. The minimum air space shown in
Figure 12 is maintained around the
outside of the vent pipe to provide air
circulation.
If above three conditions cannot be
met simultaneously when penetrating a
combustible wall, CPVC pipe must be used
for wall penetration up to the exterior vent
termination. A PVC vent termination may
be used outside to terminate the CPVC vent.
• Size and cut wall opening such that a
minimal clearance is obtained and to allow
easy insertion of vent pipe.
• 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 12).
• Secure trim plate to wall with nails or
screws and seal ID and plate OD or
perimeter with sealant material.
• Install rodent screen and vent terminal
(supplied with boiler). See Figure 13 for
appropriate conguration details.
NOTICE
Methods of securing and sealing terminals to
the outside wall must not restrain the thermal
expansion of the vent pipe.
Figure 12: Wall Penetration Clearances
for PVC Vent Pipe
Figure 13: Rodent Screen Installation, Horizontal
Vertical, Straight Vent Terminations