Rinnai RUCS65i series Installation And Operation Manual page 21

Tankless Water Heaters with PVC/CPVC venting must be configured with intake air and exhaust vent using
piping and methods described in this section. Each water heater must have its own intake and vent. DO NOT
common vent with any other appliance using this method. Inspect finished vent and intake air piping thoroughly
to ensure all are airtight and comply with the instructions provided and with all requirements of applicable
codes. Failure to provide a properly installed vent and air system will cause personal injury or death.
Combustion Air Intake - The combustion air intake termination fitting must be installed with the clearances and
geometry relative to the exhaust (vent) depicted in this section to ensure that flue products do not enter the
combustion air intake. Ensure that the intake air will not contain any of the contaminants outlined in the
"Determine Installation Location" section of this manual. Contaminated intake air will damage the water
heater, resulting in possible property damage, personal injury, or death.
Exhaust - The exhaust (vent) termination fitting must be installed with the clearances and geometry relative to
the combustion air pipe as depicted in this section to ensure that flue products do not enter the combustion air
intake
The installation must conform with local codes or, in the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.1. DO NOT use
cellular core PVC, CPVC, Radel, ABS, or galvanized material for the exhaust vent. Vents MUST be of solid core
pipes ONLY.
Use only the materials listed in this manual for vent, combustion air intake pipe, and fittings (See "Vent and Air
Piping" table) . Failure to comply with this warning could result in property damage, personal injury, or death.
If used, a masonry chimney can ONLY be used as a CHIMINEY CHASE for the exhaust and combustion air intake
pipes. The exhaust and air piping must be installed as instructed in this manual. The chimney chase must be
used only for the Rinnai Water Heater(s) vent chase. NO OTHER appliance or fireplace can be connected to the
chimney chase. Exhaust and air piping materials must comply with this instruction. The chimney chase must be
fitted with a sealed access opening to facilitate interior inspection. The chimney chase (and liner, if installed) to
be inspected annually for any degradation. Failure to comply could result in property damage, personal injury,
or death.
If the vent and/or combustion air intake piping configurations covered in this manual cannot be applied to a
specific installation, contact Rinnai's Application Engineer group for assistance. Other configurations may be
available.
DANGER
WARNING
WARNING
WARNING
WARNING
NOTICE
KCM Series Manual 21