Installation manual
24 RIVA PLUS COMBI MANUAL
E PVC vent requirements
All piping that is used to vent the Riva boiler must conform to the standards listed
below.
It is not permitted to use a cellular foam core pipe for venting the Riva boiler. All intake piping
can be constructed of PVC pipe. The rst 8 feet of exhaust pipe must be CPVC pipe. After
that point it is permissible to assemble the rest of the vent in PVC.
Canadian Installations:
• PVC/CPVC vent pipe must be listed to ULC S636. Pipe, ttings, and cements are certied
as a system and must be installed as such. Different manufacturers have different materials,
joining systems and adhesives. Do not mix pipe, ttings, solvents, or joining methods from
different BH Vent manufacturers, this can result in unsafe conditions.
• Consult PVC/CPVC manufacturer’s installation manual for correct joining of pipe for gas
venting.
General installation:
1. Cut pipe to required lengths and dry t the venting and intake system to ensure a proper t.
2. Disassemble the system and de burr the inside and outside of the pipe ends.
3. Chamfer the outside of each end of the pipes.
4. Make sure that each pipe end and tting are clean. Once they are do not handle the joining
surfaces.
5. Apply primer to both the tting and the pipe end.
6. While the primer is damp, apply a even coating of cement to the pipe end and the tting.
7. Insert the pipe into the tting making sure the pipe is completely seated.
8. Rotate the pipe 1/4 turn and hold in place for 30 seconds.
9. Wipe any excess cement away and check that there is a complete bead of sealant around
the joint of the tting.
10. Allow to cure for 2 hours before commissioning the boiler.
11. Install perforated metal pipe supports onto the pipe, making sure there is no sagging in the
pipe. Place supports as close as possible to elbows to relieve stress on the joint.
Parts Material United States Canada
Exhaust and Intake
Piping
PVC ANSI/ASTM D1785
ULC S636
CPVC ANSI/ASTM DF441
Pipe Cement /
Primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
9. Venting Cont.










