Manual Draining Of The Water Heater - Rinnai REU-KA2530FFUD-US Service Manual

WARNING
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, hot water valve and gas supply.
2. Turn off the temperature controller.
3. Disconnect the power to the water heater.
4. Remove the drain caps on both isolation 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 filter to drain the cold water.
6. Unscrew the water drain plug from the drain line next to
the hot water outlet and remove the condensate trap drain
plug. Allow to drain.
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. Insert the condensate trap drain plug and screw in the
water drain plug.
3. Screw in the water filter in the cold water inlet.
4. Replace the drain caps and close both isolation valves. -
OR- Screw in the hot water drain plug.
5. Open the cold water supply and hot water valve.
6. Open a tap and confirm that water flows, and then close.
7. Turn on the power.
8. After confirming that the temperature controller is off, turn
on the gas supply.
9. 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
EZConnect™ should be drained to prevent freezing if not in use.)
1. Turn the water heater off.
2. Close the gas supply valve.
3. Turn on a hot water tap to flow 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 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.
Condensing Water Heater Service Manual

Manual Draining of the Water Heater

To avoid burns, wait until the equipment cools down before draining the water. The
water in the appliance will remain hot after it is turned off.
* Use a wrench or other tool to unscrew the
hot water drain plug.
Hot water
outlet
Condensate
trap drain plug
Water
drain plug
Hot water
outlet
ON!
HOT
20
Hot water
drain plug*
Cold water
Water
inlet
drain
plug
Cold water
Gas
inlet
connection
Condensate
Condensate
drain line
trap drain plug
COLD
0.1 gal/min or
about 0.2 inch
thick
100000354
Water
filter