Rinnai Circ-Logic RU80i, Manual

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6
Determine Installation Location
For PVC/CPVC vent systems reduce the maximum
allowable length for each elbow and termination type
as follows and as referenced in Tables 4-7 of this
document:
Exhaust and Combustion Air Intake Pipe Diameters
and Max Lengths:

For PVC/CPVC vent systems reduce the maximum
allowable length for each elbow and termination
type as follows:

Exhaust and combustion air intake pipe diameters
to be as specified in Tables 4-7 of this document.

Do not exceed exhaust and combustion air intake
pipe MAXIMUM lengths as outlined in Tables 4-7
of this document. (Lengths are specific to models
and fuel type).

2.5 feet for every 45° elbow.

5 feet for every 90° elbow.

Termination (refer to Table 10 of this
document.)
Environment
Air surrounding the water heater, venting, and vent
termination(s) is used for combustion and must be free
of any compounds that cause corrosion of internal
components. These include corrosive compounds that
are found in aerosol sprays, detergents, bleaches,
cleaning solvents, oil based paints/ varnishes, and
refrigerants. The air in beauty shops, dry cleaning
stores, photo processing labs, and storage areas for
pool supplies often contains these compounds.
Therefore it is recommended that outdoor models be
used for these locations where possible.
The water heater, venting, and vent termination(s)
should not be installed in any areas where the air may
contain these corrosive compounds. If it is necessary
for a water heater to be located in areas which may
contain corrosive compounds, the following
instructions are strongly recommended.
IMPORTANT CONSIDERATIONS:

DO NOT Install in areas where air for combustion
can be contaminated with chemicals.

Before installation, consider where air has the
ability to travel within the building to the water
heater.

Where possible, install the water heater in a
sealed closet so that it is protected from the
potential of contaminated indoor air.

Chemicals that are corrosive in nature should not
be stored or used near the water heater.

Locate the vent outlet where flue gases will not
harm surrounding plants and/or cooling
equipment. All vent locations must adhere to the
recommended vent/combustion air intake
terminal position as outlined in Table 2.

Avoid locating vent where prevailing winds could
affect the performance of the water heater or
cause recirculation of the flue gases.

DO NOT terminate the venting over a public
walkway or over an area where condensate or
vapor can create a nuisance / hazard or where
condensate can be detrimental to the operation of
equipment such as regulators or relief valves.

Water Heater flue gases must be piped from the
appliance to the outside, Installer MUST adhere
to the instructions provided herein and the most
recent Water Heater Manual and all applicable
codes.

The exhaust and combustion air must terminate
through the same sidewall or roof as the
terminations must be in the same pressure zone
and face the same direction.

The vent pipe must terminate either through the
sidewall or through the roof, exhaust/vent
termination and/or intake air openings shall
adhere to clearances as set forth in the Direct
Vent Termination Clearances diagram.

Each Condensing Tankless Water Heater
requires a separate vent system.

If common venting is required, refer to Rinnai
Common Vent Installation Manual (latest revision)
for instructions on optional venting method as well
as to verify which tankless models may be
common vented.

Use only PVC/CPVC 3” and 4” Venting.
Damage and repair due to corrosive compounds in the
air is not covered by warranty.