18
*
Damage can occur from frozen water within the device 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.
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 operation switch is ON or OFF.)
* Remember to set mixing valves and xtures to their original levels before using the unit again
to prevent scalding.
* If there is still a risk that the unit will freeze, drain the unit as shown on the next page.
Preventing Damage from Freezing
[For Model Series NR66 and NR71 only]
Freezing is prevented within the device automatically by the freeze-prevention heate
(Model NR50-OD does not include this feature)
If water will not ow because it is frozen
1. Close the gas and water valves.
2. Turn off the power button.
3. Open the water supply valve from time to time to check whether water is running.
4. When the water is owing again, check for water leaks from the equipment and piping
before using.
If the heater or the piping is frozen, do not use the heater or it may get damaged.
CAUTION
* In normal operation, freezing is prevented within the device automatically unless the outside
temperature without wind is below -30°F (indoor installation) or -4°F (outdoor installation).
* The freeze prevention heaters will not prevent the plumbing external to the unit 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.
Take the measures below for extremely cold temperatures*.
For model NR50-OD, this procedure
must be done to prevent freezing. <Only using the remote controller>
(outside temperature including wind chill factor less than -30°F (indoor installation) or
-4°F (outdoor installation)).
This method can protect not only the heater, but also the water supply,
water piping and mixing valves.
1. Turn off the power.
2. Close the gas supply valve.
3. Open a hot water xture, and keep a small stream of hot water running.
(0.1 gal/minute or about 0.2" thick.)
* If there is a mixing valve, set it to the highest level.
4. The ow may become unstable from time to time. Check the ow 30 minutes later.
* In general, it is not advisable to run water through the unit when
it is OFF ( p. 6), but in this case freeze prevention is more important.
0.2" thick
Hot Water Fixture
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