Rinnai RU80i - Twin Pipe PVC;CPVC Vent Installation Requirements; Vent and Air Piping Materials; Important Considerations for Location

KB Series Manual 19
 All PVC/CPVC IPEX Concentric Vent Kit (CVK)
Assemblies are cered to ULC S636. Where ULC S636
compliance is required, use only System 636 pipe,
ngs and cement at terminal connecon.
 use PVC/CPVC on Non-Condensing Units.
 operate unit unl venng is completely
installed and all solvents and glues have bonded.
 All PVC/CPVC exhaust vent material used in
Canada must be S636 cered.
 If the preferred venng opon is a twin pipe PVC/CPVC
conguraon, the Rinnai approved twin pipe adaptor
must be used.
For further details on listed PVC/CPVC venng
material (table below) refer to the installaon manual of
the PVC/CPVC manufacturer.
Twin Pipe PVC/CPVC Vent Installaon Requirments:

 

 

Vent or combuson air
intake pipe & Fings
PVC schedule 40 ANSI/ASTM D1785
Thermoplasc vent pipe must be
cered to ULC S636.
Intake pipe may be of any material listed
(le).
PVC-DWV ANSI/ASTM D2665
CPVC schedule 40 ANSI/ASTM F441
PVC pipe cement &
primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493

Terminaon Vent
Screens
Polyethylene
3" Vent screen: IPEX part # 196051; 4" Vent screen: part #: 196052
(Screens are fricon ed inside terminaon ng bells.)
The listed vent, vent ngs, terminaon, cleaner and glue are all cered as part of the condensing tankless
water heater vent system.


Failure to correctly install vent and combuson air intake pipes of the water heater to atmosphere as outlined
in this venng secon will result in death from asphyxiaon (from carbon monoxide), re or explosion. 
operate the water heater without proper venng (vent and combuson air intake). Always inspect the vent
terminal unit, combuson air intake pipe, and the enre vent system axed to the water heater for proper
installaon at equipment commissioning and at least annually thereaer.

 Locate the vent outlet where ue gases will not harm
surrounding plants and/or cooling equipment.
 Avoid locang vent where prevailing winds could
aect the performance of the water heater or cause
recirculaon of the ue gases.
 terminate the venng over a public walkway
or over an area where condensate or vapor can cre-
ate a nuisance / hazard or where condensate can be
detrimental to the operaon of equipment such as
regulators or relief valves
 Water Heater ue gases must be piped from the
appliance to the outside, Installer MUST adhere to the
instrucons provided herein and the most
recent Water Heater Manual and all applicable codes.
 Exhaust and combuson air must terminate through
the same sidewall or roof as the terminaons must be
in the same pressure zone and face same direcon.
 Vent pipe must terminate either through the sidewall
or through the roof, exhaust/vent terminaon and/or
intake air openings shall adhere to clearances as set
forth in the Direct Vent Terminaon Clearances
diagram.
 Each Condensing Tankless Water Heater requires a
separate vent system.
 If common venng is required, refer to Rinnai
Common Vent Installaon Manual (latest revision) for
instrucons on oponal venng method as well as to
verify which tankless models may be common vented.
 Use only PVC/CPVC 3” and 4” Venng.