John Wood Noritz N-069M-DV - Manual (Page 17)

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* 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.
Remarks
Freezing cannot be prevented when the power is disconnected. Do not remove the power plug
from the wall outlet.
(Freezing will be prevented regardless of whether the operation switch is ON or OFF.)
* 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 danger, contact the nearest Noritz agent.
1. Turn the unit on with the Power Button on the Remote Controller.
2. Close the gas supply valve.
3. Open a hot water fixture and let it run for approx. 1 minute, and
then check that the number 11 is flashing on the remote controller
display.
* If multiple units are being used, drain one minute for each unit.
* It is possible that a different number may be displayed on the
remote controller, but as long as it is flashing, you may continue.
4. Partially close the hot water fixture, but keep a small amount of hot
water running. (.1 gal./minute or about .2 " thick.)
* If there is a mixing valve, set it to the highest level.
* When linking multiple units, discharge water equivalent to
.1 gal./minute per unit.
5. The flow may become unstable from time to time. Check the flow
30 minutes later.
Hot Water Fixture
Preventing Damage from Freezing -1
Freezing is prevented within the device automatically by the freeze-prevention heater
If water will not flow 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 flowing 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.
.2 " thick
* Remember to set mixing valves and fixtures to their original levels before using the unit again
to prevent scalding.
* If there is still a chance that the unit will freeze, drain the unit as on the next page.
Take the measures below for extremely cold temperatures*.
*(outside temperature including wind chill factor less than 5
°
F)
This method can protect not only to the heater, but also to the water supply,
water piping and mixing valves.
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