U.S. Boiler Company K2, Installation Instructions Manual

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VII. Venting
G. Assembly of Selkirk Polyflue Vent Systems (continued)
e. Support each pipe section as described in Polyflue manual at intervals not exceeding the following:
Pipe size Horizontal Vertical
2” 30in 16ft
3” 39in 16ft
nOTiCE
Once a vent pipe is inserted into this adaptor, it is IMPOSSIBLE to remove it. Make sure the correct type of
pipe is selected, and that it is of the correct length, before inserting it into the vent adaptor.
3. Installation of Air Intake System - Start assembly of the PVC air intake system at the boiler. Assembly of the air intake
system is done in the same manner as the vent system except as follows:
a. Drill a 7/32” clearance hole into the front side of the air intake adapter. Insert the first piece of PVC air intake pipe into the
air intake connection and drill a 1/8” tap hole into the PVC which lines up with the 7/32” clearance hole and secure
them together with a #10 x 1” sheet metal screw. Seal the joint between the intake pipe and the adaptor with RTV.
b. All intake piping may be PVC. There is a 0” minimum clearance between the air intake piping and all types of
construction.
c. To the extent possible, pitch horizontal air intake piping towards the outside.
4. Installation of Horizontal Fitting Terminals (Terminal Option A):
a. See Figure 7.42 for proper orientation of twin pipe horizontal terminals. Outer edge of exhaust coupling must be 10” or
less from the wall surface. (Figure 7.9)
b. Remove the gasket from the end of the integral exhaust coupling and insert Selkirk #2PF-HVST or #3PFHVST in its
place.
c. Add PVC intake per instructions from Part VII-F.
5. Installation of Vertical Fitting Terminals (Terminal Option H):
a. See Figure 7.43 for the proper orientation of twin pipe vertical terminals.
b. Remove the gasket from the end of the integral exhaust coupling and insert Selkirk #2PF-HVST or #3PFHVST in its
place.
c. A 180° bend (or two 90° elbows) are installed on the top of the air intake pipe. If two 90° elbows are used, the rodent
screen provided can be installed between them (Figure 7.43). If a 180° bend is used, install the rodent screen in the open
side of the bend, using a ring made of PVC pipe. If desired, the termination fittings can be attached to the end of the intake
pipes with field supplied stainless steel screws so that they can be later removed for cleaning and inspection. If this is
done, drill a clearance hole in these fittings and a tap hole in the end of the intake pipes to accept these screws.
d. Use roof flashings and storm collars to prevent moisture from entering the building. Seal the roof flashing to the roof
using generally accepted practice for the type of roof on the installation. Apply RTV to seal the storm collars to the vent
and intake pipes.
Warning
Asphyxiation Hazard. Selkirk Polyflue vent systems rely on gaskets for proper sealing. When this vent
system is used, take the following precautions:
• Make sure that gasket is in position and undamaged in the female end of the pipe.
• Make sure that both the male and female pipes are free of damage prior to assembly.
• Only cut vent pipe as permitted by the vent manufacturer in accordance with their Instructions. When
pipe is cut, the cut end must be square and carefully de-burred prior to assembly.
• Use pipe locking bands at all vent pipe joints.
nOTiCE
The venting system must be free to expand and contract and supported in accordance with the
installation instructions included by the original Polypropylene venting component manufacturer, Selkirk.
Polypropylene pipe sections must be disengaged 1/8 to 1/4 in. (3mm to 6mm) per joint to allow for thermal
expansion.