Rinnai ThermaCirc360 RUR199i Installation And Operation Manual page 13

Internal (Indoor) Water Heaters
•
Install the water heater as far away as possible from any air inlet vents. Corrosive fumes, sometimes found in hair/
nail salons, spas, or other industries exposed to toxic fumes, may be released through these vents when not in
operation. Chemicals that are corrosive in nature should not be stored or used near the water heater or vent
termination. This requirement applies to internal (indoor) and external (outdoor) water heaters.
•
In coastal regions, the water heater should be installed so that it is sheltered/protected from exposure to sea
breeze. Exposure to salty spray or breeze can cause corrosion of the water heater.
DO NOT install the water heater in areas where combustion air might be contaminated with chemicals.
DO NOT use room air in applications where the indoor air is corrosive. Install the water heater as direct vent
in a sealed closet so that it is protected from the potential of contaminated indoor air.
External Water Heaters and Vent Terminations
•
Install the water heater as far away as possible from exhaust vent hoods and dryer vents.
•
In coastal regions, the water heater should be installed so that it is sheltered/protected from exposure to sea
breeze. Exposure to salty spray or breeze can cause corrosion of the water heater.
•
Damage and repair due to corrosive compounds in the air is not covered by warranty.
•
Install the water heater as far away as possible from any air inlet vents. Corrosive fumes, sometimes found in hair/
nail salons, spas, or other industries exposed to toxic fumes, may be released through these vents when not in
operation. Chemicals that are corrosive in nature should not be stored or used near the water heater or vent
termination. This requirement applies to internal (indoor) and external (outdoor) water heaters.
Freeze Protection
Make sure that in case of freezing weather the
water heater and its water lines are protected to
prevent freezing. Damage due to freezing is not
covered by the warranty.
When connected to a 120-volt power supply, the
water heater will not freeze when the outside air
temperature is as cold as –22°F (-30°C) for
internal (indoor) models or –4°F (-20°C) for
external (outdoor) models, when protected from
direct wind exposure. Because of the "wind-chill"
effect, any wind or circulation of the air on the
water heater will reduce its ability to protect
itself from freezing.
In the event of a power failure and/or gas
interruption at temperatures below freezing, the
water heater should manually be drained of all
water to prevent freezing damage. In addition,
drain the condensate trap, drain line and
pressure relief valve.
Loss of freeze protection may result in water
damage from a burst heat exchanger or water
lines.
The water heater may be drained manually.
However, it is highly recommended to install the
optional Drain Down Kit accessory that will
enable the water heater to immediately drain
upon loss of power (the condensate trap and
pressure relief valve are not affected by the Drain
Down Kit and must be manually drained).
The freeze protection features will not prevent
the external piping and valves from freezing. It is
recommended that hot and cold water pipes be
insulated. Pipe cover enclosures may be packed
with insulation for added freeze protection.
Rinnai Tankless Water Heater Installation and Operation Manual
Freeze Protection Piping Diagram
Hot Water
Supply Line
1/2 in. Normally Open Solenoid Valve
Route Drain Per Local Code
Vacuum Breaker *
Legend
Vacuum Breaker
Pressure Relief Valve
Union
Check Valve
Ball Valve
Solenoid Valve
Drain Valve
* Position vacuum breaker
above water heater.
Gas Supply
3/4 in. Normally Closed Solenoid Valve
Cold Water
Supply Line
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