Biasi Riva Advance Combi Installation & Operation Instructions page 25

9. Venting Cont.
I PVC roof vent kit - Part# RI 3PPS-VK
This kit allows vertical termination of the flue pipe using PVC/CPVC pipe. The kit includes
boiler connection and termination adapted for CPVC/PVC. 3" PVC/CPVC pipe may be added
up to the total overall maximum permissible length of 132' intake and exhaust combined.
Optional 45° and 90° elbows can be used to offset the flue route. Each additional elbow reduces
the overall acceptable length of the flue system as follows:
Max Length (intake + exhaust)
Min Length (intake + exhaust)
Canada: All PVC/CPVC pipe, fittings, and cement must be approved to ULC S636. Do
not mix pipe and joining compounds from different manufacturers as this can
result in an unsafe condition and void the certification.
Installation:
• Choose the appropriate weather collar for the installation, Pitched or Flat.
• Drill a hole through the roof large enough to accommodate the 5.5" vent terminal.
• Fix the flue collar in place and insert the termination from outside the building.
• Fix the supplied wall clamp around the vent terminal but do not tighten it.
• Assemble the gaskets with the concentric pipe adapter. It may be necessary to use a small
amount of water.
• Install the PVC adapters supplied onto the twin pipe adapter according the manufacturers
instructions.
• Install piping to the boiler making sure not to exceed the maximum allowable length.
• Intake air piping can be constructed of PVC pipe. Exhaust piping must be CPVC or
Polypropylene for the first 8 feet.
• Intake and exhaust piping should be assembled and secured according to the pipe
manufacturers instructions.
• Install the vent adapter onto the top of the boiler using the gasket and screws provided.
• Install the pipe onto the boiler by simply pushing it into the adapters. Do not cement the pipe
into the adapters, this is a gasket connection.
25 RIVA ADVANCE COMBI MANUAL
Figure 9.8 (Equivalent length - 9')
Venting Specifications
132 f
3 ft.
2.9 ft. equivalent
45° elbow
5.4 ft. equivalent
90° elbow