Rinnai RSC199i Installation And Operation Manual page 23

4.3.7 Installation Location Checklist
Use this checklist to ensure you have selected the correct location for the water heater.
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The water heater is not exposed to corrosive compounds in the air.
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The water heater location complies with the required clearances.
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The planned combustion air and exhaust termination locations meet the required
clearances.
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The water supply does not contain chemicals or exceed total hardness that will damage
the heat exchanger.
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A standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet (for internal/indoor
models) or other 120 VAC, 60 Hz source is available.
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The installation must conform with local codes or, in the absence of local codes, with
the National Fuel Gas Code, ANSI Z221.3/NFPA 54, or the Natural Gas and Propane
Installation Code, CSA B149.1
Rinnai Tankless Water Heater Installation and Operation Manual 23