Rinnai Circ-Logic RU80i, Manual

Page: 4 / 28

4
Use only the materials listed in the Water Heater Manual and this guide for vent, combustion air intake pipe and
fittings (See table 1). Failure to comply with this warning could result in severe personal injury, death or
substantial property damage.
WARNING
If used, a masonry chimney can
ONLY be used as a PIPE CHASE for the exhaust and combustion air intake
pipes. The exhaust and air piping must be installed as instructed in this guide and applicable Water Heater
Manual. The chimney must be used only for Rinnai Water Heater(s) vent chase.
NO OTHER appliance or
fireplace can be connected to the chimney. Exhaust and air piping materials must comply with this instruction.
The chimney 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 severe personal
injury, death, or substantial property damage.
WARNING
Combustion Air Intake - Install combustion air inlet piping for the condensing tankless water heaters as
described in the Water Heater Manual and this guide. The combustion air intake termination fitting must be
installed with the clearances and geometry relative to the exhaust (vent) depicted in this document to ensure that
flue products do not enter the combustion air intake. Ensure that the intake air will not contain any of the
contaminants as outlined in the “
Determine Installation Location ” section of this document. Contaminated
intake air will damage the water heater, resulting in possible severe personal injury, death, or substantial property
damage.
Exhaust - Provide exhaust (vent) piping to Water Heater as specified in this guide and as required by all
applicable codes. The exhaust (vent) termination fitting must be installed with the clearances and geometry
relative to the combustion air pipe as depicted in this document to ensure that flue products do not enter the
combustion air intake
WARNING
Tankless Water Heaters must be vented and furnished with intake air and exhaust vent using piping and
methods described in this guide and the appliance installation instructions. 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 severe
personal injury or death.
DANGER
Installations must comply with local requirements and with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54
for U.S. installations or CSA B149.1 for Canadian installations. DO NOT use cellular core PVC, CPVC, or Radel
based pipe materials for the exhaust vent. Vents MUST be of solid core pipes ONLY.
WARNING
If the vent and/or combustion air intake piping configurations covered in the Water Heater Manual and this guide
cannot be applied to a specific installation, contact Rinnai’s Application Engineer group for assistance. Other
configurations may be available.
NOTICE