13
Preventing Damage from Freezing
Freezing cannot be prevented when the power plug
is unplugged. Do not remove the power plug from
the wall outlet.
Freezing will be prevented regardless of whether
the button is ON or OFF.
• In normal operation, freezing is prevented within
the Water Heater automatically unless the
outside temperature without wind is below -30°F
(-35°C) when supplying combustion air from the
outdoor (Direct Vent) or -4°F (-20°C) when the
Water Heater is installed outdoors.
• For indoor installation, when supplying
combustion air from the indoors, the room
temperature must be greater than 32°F (0°C) to
prevent freezing and the room inside must not
have negative pressure.
• The freeze prevention heaters will not prevent
the plumbing external to the Water Heater from
freezing. Protect this plumbing with insulation,
heat tape or electric heaters, solenoids, or pipe
covers. If there remains a freezing risk, contact
the nearest Noritz agent.
This method can protect not only the Water Heater,
but also the water supply, water piping and mixing
valves.
* Outside temperature including wind chill factor less
than -30°F (-35°C) when supplying combustion air
from the outdoor (Direct Vent) or -4°F (-20°C) when
the Water Heater is installed outdoors.
Take the measures below for extremely
cold temperatures*.
Preventing Damage from Freezing
• Damage can occur from frozen water within
the appliance and pipes even in warm
environments. Be sure to read below for
appropriate measures.
• Repairs for damage caused by freezing are not
covered by the warranty.
NOTICE
Freezing is prevented within the device
automatically by the freeze prevention
heater and pump.
NOTE
• Remember to set mixing valves
and fixtures to their original levels
before using the Water Heater
again to prevent scalding.
• If there is still a risk that the Water
Heater will freeze, drain the Water
Heater as shown on the next page.
1. Turn off the button.
2. Close the gas supply valve.
3. Open a hot water
fixture/faucet, and
keep a small stream
of hot water running.
(0.1 gallon (400 mL)/
minute or about 0.2
in. (4 mm) thick.)
• If there is a mixing valve, set it to the
highest level.
• When linking multiple Water Heaters,
discharge water equivalent to (0.1 gallon
(400 mL)/minute per Water Heater.)
4. The flow may become unstable from time to
time. Check the flow 30 minutes later.
• In general, it is not advisable to run water
through the Water Heater when it is
OFF (See page 5), but in this case freeze
prevention is more important.
NOTE
If the Water Heater or the piping is
frozen, do not use the Water Heater
or it may get damaged.
1. Close the gas and water valves.
2. Turn off the button.
3. Open the water supply valve from time to time
to check whether water is running.
4. When the water is flowing again, check for
water leaks from the Water Heater and piping
before using.
If water will not flow because it is frozen
• To prevent damage from freezing, the Water
Heater must be plugged into power at all
times. If power is unplugged, drain the water
completely from the Water Heater. Then use an
air compressor to remove all water from inside
the water piping of the Water Heater.
• It is recommended that Isolation Valves are
installed on the Water Heater, otherwise the
water connections will need to be removed to
drain the Water Heater completely.
If the Water Heater will not be used for a
long period of time, drain the water.
• To prevent burns or scalding, turn off the
button and wait until the appliance cools
before performing maintenance.
• Do not touch the power cord with wet hands.
WARNING
0.2 in. (4 mm)
thick
Hot water fixture/faucet
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