39
3.7.2 MANUAL DRAINING OF THE WATER HEATER
If the water heater is not going to be used during a period of possible freezing weather, it is recommended that the
water inside the water heater be drained.
To manually drain the water:
1.
Shut off cold water supply and gas supply.
2.
Turn off the temperature controller.
3.
Disconnect the power to the water heater.
4.
Place a container to catch the water. Open hot
water tap or open hot
water drain plug at the hot water outlet.
5.
Remove water filter to drain the cold water.
To resume normal operation:
1.
Confirm that all water drain plugs are removed, that the gas supply is
turned off, and that all taps are closed.
2.
Screw in the water filter and the water drain plug in the hot water
connections.
3.
Open the cold water supply.
4.
Open a tap and confirm that water flows, and then close.
5. Turn on the power.
6.
After confirming that the temperature controller is off, turn on the gas supply.
7.
Turn on the temperature controller.
Running a low volume of water through the water heater to prevent freezing
If the temperature exceeds the ability of the water heater to freeze protect
itself, or if power is lost, the following steps may prevent the water heater
and external piping from freezing.
•
Turn the water heater off.
•
Close the gas supply valve.
•
Turn on a hot water tap to flow water about 0.4 l/min or where the
stream is about 5 mm thick.
When the water heater or external piping has frozen
1.
Do not operate the water heater if it or the external piping is frozen.
2.
Close the gas and water valves and turn off the power.
3.
Wait until the water thaws. Check by opening the water supply valve.
4.
Check the water heater and the piping for leaks.
Coastal installations
Installations located in or near coastal areas may require additional maintenance due to corrosive airborne ocean salt.
HOT
COLD
ON!
0.4 l/min or
about 5 mm
thick
Water filter
Cold water inlet
Hot water drain plug
(pressure relief valve)
Hot water outlet
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