25
IV. Venting
B. CPVC/PVC Venting (continued)
• When thimble is not used for non-
combustible wall, 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
thimble or wall opening to provide
weather-tight seal. Sealant should not
restrain the expansion of the vent pipe.
• Install rodent screen and vent terminal
(supplied with boiler). See Figure 13 for
appropriate configuration details.
NOTICE
Methods of securing and sealing terminals to
the outside wall must not restrain the thermal
expansion of the vent pipe.
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 configuration
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.
• At top of vent pipe length install another
PVC 90° elbow 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 configuration.
• 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 vent pipe.
See Figure 6B.
• At top of air pipe length install another
PVC 90° elbow 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 configuration.
• Brace exterior piping if required.
6. Vertical Roof Termination
a. Standard Two-Pipe Termination
See Figures 7 and 8.
i.
Vent Piping
• Install fire stops where vent passes
through floors, ceilings or framed walls.
The fire stop must close the opening
between the vent pipe and the structure.
• Whenever possible, install vent straight
through the roof. Refer to Figures 7 and
8.
- Size roof opening to maintain
minimum clearance of 1 in. (25 mm)
from combustible materials.
- Extend vent pipe to maintain
minimum vertical and horizontal
distance of 12 in. (300 mm) from
roof surface. Allow additional
vertical distance for expected snow
accumulation. Provide brace as
required.
NOTICE
Vertical venting and combustion air roof
penetrations (where applicable) require the use
of roof flashing and storm collar, which are not
supplied with boiler, to prevent moisture from
entering the structure.
- Install storm collar on vent pipe
immediately above flashing. Apply
Dow Corning Silastic 732 RTV
Figure 13: Rodent Screen Installation
Summary of Contents for APEX
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Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
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Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
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