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107774-02 - 4/18
VII. Venting
E. Assembly of CPVC/PVC Vent Systems (continued)
E. Assembly of CPVC/PVC Vent Systems
1. Assemble the vent system, starting at the boiler:
a. If 3” PVC is to be used for venting, a 3” CPVC elbow and the 30” straight section of CPVC must be used
before transitioning to PVC. If necessary the 30” straight section of CPVC may be cut at any location and a
CPVC elbow can be inserted between the two resulting segments.
b. When cutting CPVC or PVC pipe, use a miter saw or a saw designed to cut PVC pipe. Use a miter box or
other method to cut pipe squarely. De-burr both the inside and outside of the cut end.
c. Dry fit all vent components before assembly.
d. The vent adaptor has three different inside diameters. The larger (upper) inside diameter accepts 3” CPVC
pipe and is used in this application (the middle inside diameter accepts 3” nominal PolyPro, Polyflue or
InnoFlue, and the smaller, lower inside diameter accepts 3” stainless steel). A locking band clamp in the
adaptor prevents the vent pipe from coming out of the adaptor once it is installed and tightened. Lubricate the
upper gasket in the vent adaptor with water and insert the first piece of 3” CPVC into the vent adaptor until it
bottoms out. Tighten locking band clamp to secure vent pipe.
e. Assemble a 3” CPVC elbow and remainder of 30” CPVC piping before transitioning to PVC. If 3” PVC is
used, the first piece of PVC will either be connected to the CPVC elbow or the end of a section of CPVC vent
pipe. In the latter case, a PVC coupling may be used to connect the first piece of PVC to the last piece of
CPVC.
f. Clean all CPVC and PVC components with the appropriate primer before cementing. Cement the vent system
together, starting at the boiler and following the instructions provided on the cans of cement and primer. Use
a field supplied cement and primer that is listed for use with the materials being joined (CPVC and/or PVC).
The following, or its equivalent, may be used to join CPVC to PVC:
• IPS Corporation #P-70 Primer
• IPS Corporation #790 Multi-Purpose Solvent Cement
Always use primer on both the pipe and fitting before applying the cement. Assemble the pipe in
accordance with the instructions on the cans of primer and cement.
g. Assemble the rest of the vent system, being sure to pitch horizontal sections back towards the boiler 1/4”/ft.
Support the vent at intervals not exceeding 4ft.
h. Maintain the clearances from the vent pipe outlined in Section VII - A of this manual. If exiting the exterior wall
using PVC pipe, use half of an appropriately sized wall thimble (or a sheet metal plate) on the exterior of the
building, to provide a weather tight seal while maintaining the proper clearance in the wall penetration. Seal
the joint between the pipe and the wall plate using RTV applied on the exterior side of the wall. This sealant
must not restrain the expansion of the vent pipe.
2. 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.
WARNING Asphyxiation Hazard. Failure to follow these instructions could cause products of
combustion to enter the building, resulting in severe property damage, personal injury or death.
Use all CPVC vent components for near-boiler vent piping before transitioning to Schedule 40 PVC pipe
(ASTM 2665) components for remainder of vent system.
Use CPVC vent components within any interior space where air cannot circulate freely, including through
vertical or horizontal chase ways, inside a stud wall, in closets and through wall penetrations.
The use of cellular core PVC (ASTM F891), cellular core CPVC or Radel (polyphenolsulfone is prohibited.
All condensate that forms in the vent must be able to drain back to the boiler.
Never leave the boiler in operation without the gas sample cap in place (Figure 7.27).
Summary of Contents for K2WTC-135
Page 81: ...81 107774 02 4 18 X Domestic Hot Water Piping continued Figure 10 1 Domestic Hot Water Piping...
Page 89: ...89 107774 02 4 18 XI Wiring continued...
Page 90: ...90 107774 02 4 18 Figure 11 8 Internal Wiring Connections Diagram XI Wiring continued...
Page 101: ...101 107774 02 4 18 Lighting and Operating Instructions XII Start Up and Checkout continued...
Page 142: ...142 107774 02 4 18 XVI Repair Parts continued...
Page 145: ...145 107774 02 4 18 XVI Repair Parts continued...
Page 148: ...148 107774 02 4 18 XVI Repair Parts continued...
Page 150: ...150 107774 02 4 18 XVI Repair Parts continued...
Page 152: ...152 107774 02 4 18 XVI Repair Parts continued 120 121 122 123 124 125 126 127...
Page 159: ...159 107774 02 4 18 SERVICE RECORD DATE SERVICE PERFORMED...