Install Instructions

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Figure 9B : Direct Vent - Sidewall Terminations
(Optional)
IV. Venting B. CPVC/PVC Venting (continued)
Figure 10: Rodent Screen Installation
• 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
10 for appropriate conguration.
• Brace exterior piping if required.
WARNING
All CPVC supplied with the vent kit must be
used prior to connection of the vent system to
this terminal. If the vent system is too short
to permit this, do not use this terminal.
Do not operate boiler without the rain cap in
place.
Methods of securing and sealing terminals
to the outside wall must not restrain the
thermal expansion of the vent pipe.
Figure 11: Direct Vent - Optional Sidewall
Snorkel Terminations
7. Vertical Vent Termination
a. Standard Two-Pipe Termination
Refer to Figures 8, 10, 12 and 13.
i. Vent Piping
• Install re stops where vent passes through
oors, ceilings or framed walls. The re
stop must close the opening between the
vent pipe and the structure.
• Whenever possible, install vent straight
through the roof. Refer to Figures 12 and
13.
- Size roof opening to maintain minimum
clearance of 1" from combustible
materials.
- Extend vent pipe to maintain minimum
vertical and horizontal distance of twelve
(12) inches from roof surface. Additional
vertical distance for expected snow
accumulation. Provide brace as required.
CAUTION
Vertical venting and combustion air roof
penetrations (where applicable) require the use
of roof ashing and storm collar, which are not
supplied with boiler, to prevent moisture from
entering the structure.
- Install storm collar on vent pipe
immediately above ashing. Apply
Dow Corning Silastic 732 RTV Sealant
between vent pipe and storm collar to
provide weather-tight seal.