Rinnai Demand Duo R Series Installation And Operation Manual page 13

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Commercial Hybrid System
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Temperature and Pressure Relief Valve
(pre-installed on Tank)
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Pressure Relief Valve (PRV) (pre-installed on
Tankless Water Heater)
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Intake Filter Exhaust Connector (IFEC)
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Gas Flex/Union
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Pipe Wrenches (2)
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Adjustable pliers
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Screwdrivers (2)
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Wire Cutters
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Gloves
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Safety Glasses
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Level
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Soap or gas leak detector solution
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Approved venting (6 in. B-Vent or greater)
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Teflon tape (recommended) or pipe compound
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Pipe insulation
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Gas Valve
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Hot/Cold Isolation Valve
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Hammer drill with concrete bits
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Saw
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Threading machine with heads and oiler
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Core drill with diamond head
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Torch set
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Copper tubing cutter
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Steel pipe cutter
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Heat tape
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Electrical wire and conduit per local code
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PVC glue/cement
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5/8 in. ID PVC flexible tubing
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2 conductor 22 AWG wire for controller
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Single gang electrical box
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Wire nuts
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Unions and drain valves
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Drain Pan
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Earthquake strap
Demand Duo™ R-Series Installation and Operation Manual
When selecting an installation location, you must
ensure that clearances will be met and vent
length meets the requirements of ANSI Z223.1/
NFPA 54. Consider the installation environment
and water quality. Requirements for the gas line,
water lines, and electrical connection can be
found in their respective installation sections of
this manual.
This section provides information on the
importance of water quality to the Rinnai
R-Series Commercial Automatic Circulating Tank
Water Heater. The information is intended to
serve as general guidelines only and is not a
complete list of water quality guidelines.
Consideration of care for your water heater
should include evaluation of water quality. The
water must be potable, free of corrosive
chemicals, sand, dirt, or other contaminants. It is
up to the installer to ensure the water does not
contain corrosive chemicals or elements that can
affect or damage the water heater. Water that
contains chemicals exceeding the levels below
can damage the water heater. Replacement of
components due to water quality damage is not
covered by the warranty.
Table 3: Water Quality Guidelines
Contaminant
Total Hardness
Aluminum *
Chlorides *
Copper *
Dissolved Carbon Dioxide
(CO2)
Iron *
Manganese *
pH *
TDS (Total Dissolved Solids)* Up to 500 mg/L
Zinc *
* Source: Part 143 National Secondary Drinking
Water Regulations
Maximum Level
Up to 200 mg/L
Up to 0.2 mg/L
Up to 250 mg/LL
Up to 1.0 mg/L
Up to 15.0 mg/L
Up to 0.3 mg/L
Up to 0.05 mg/L
6.5 to 8.5
Up to 5 mg/L
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