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UNSATISFACTORY
FRONT VIEW
Flame Rod
Yellow Flame
Figure 74
Rinnai Tankless Water Heater Installation and Operation Manual 78
FREEZE PROTECTION
Make sure in case of freezing weather that the
water heater and its water lines are adequately
protected to prevent freezing. Damage due to
freezing is not covered by the warranty. Refer
to the “Freeze Protection” section (Section
4.2 Choose an Installation Location > Freeze
Protection). The water heater may be drained
manually. However, it is highly recommended that
drain down solenoid valves be purchased and
installed, which will automatically drain the water
heater if power is lost. (The condensate trap drain
plug and Pressure Relief Valve are not aected by
the auto drain down solenoid valves and will have
to be manually opened.)
WINTERIZATION
The following recommendations are intended to
suggest practices that are eective for winterizing
the water heater. They should be used as a
guide only. No liability is assumed for any issues
resulting from the use of this information.
Note: See section “6.4 Draining the Water Heater”
for detailed instructions on:
• Draining the water heater
• Running a low volume of water through the
water heater to prevent freezing
• Steps to take when the water heater or
external pipes have frozen
Gas
Shut o the gas to the water heater. It is generally
preferable to shut o the gas service to the entire
location if gas is not going to be used.
Water
• Shut o the cold water supply to the water
heater. It is generally preferable to shut o
the water to the entire location if water is
not going to be used.
• Drain the water heater by opening the
drain valves on the cold water line and hot
water line.
• Open several hot water taps and remove
the lter assembly at the water inlet in
order to allow room for expansion in case
there is water in the lines that freeze.
Condensate
Drain the condensate using the condensate drain
port on the bottom of the water heater.
Electric
Disconnect the power supply by either unplugging
the electrical cord or by turning o the circuit
breaker to the water heater to prevent potential
damage from irregular power surges or
interruptions.
6.2 Cleaning and
Inspecting the Air
Filter (Indoor Units
Only)
INSPECTION
• To maintain optimum performance,
periodically inspect the air lter.
• If the air lter appears to have lint and/or
dust build up, follow the cleaning
procedure described below.
• If the air lter appears damaged, contact
a trained and qualied professional for a
replacement air lter assembly.
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