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42 VC Series Manual
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 o cold water supply and gas supply.
2. Turn o the temperature controller.
3. Disconnect the power to the water heater.
4. Place a container to catch the water. Remove the drain caps on
both isolaon valves and open both valves above the caps (blue
and red valve handles). -OR- Open hot water drain plug at the hot
water outlet.
5. Remove water lter to drain the cold water. Compressed air may
be used to purge any water le in the system.
Manual Draining of the Water Heater
To resume normal operaon:
1. Conrm that all water drain plugs are removed, that the gas supply
is turned o, and that all taps are closed.
2. Screw in the water lter in the cold water inlet.
3. Replace the drain caps and close both isolaon valves. -OR- Screw
in the hot water drain plug.
4. Open the cold water supply.
5. Open a tap and conrm that water ows, and then close.
6. Turn on the power.
7. Aer conrming that the temperature controller is o, turn on the
gas supply.
8. 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. (Units connected with EZ Connect (2
unit link) should be drained to prevent freezing if not in use.)
1. Turn the water heater o.
2. Close the gas supply valve.
3. Turn on a hot water tap to ow water about 0.1 gal/min or where the
stream is about 0.2 inches 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 o the power.
3. Wait unl the water thaws. Check by opening the water supply valve.
4. Check the water heater and the piping for leaks.
HOT
COLD
ON!
0.1 gal/min or about
0.2 inch thick
* Use a wrench or other tool
to unscrew the hot water
drain plug.
To avoid burns, wait unl the equipment cools down before draining the water. The
water in the appliance will remain hot aer it is turned o.
WARNING
Water
lter
Hot water
outlet
Hot water
drain plug *
Cold water
inlet
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