Manual Draining Of The Water Heater - Rinnai RU80i Installation And Operation Manual

Manual draining of the water heater
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 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.
6. Unscrew the water drain plug from the drain line next to the hot
water outlet.
7. Remove the condensate trap drain plug and allow to drain.
To resume normal opera on:
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.
3. Screw in the water drain plugs.
4. Screw in the water filter in the cold water inlet.
5. Open the cold water supply.
6. Open a tap and confirm that water flows, and then close.
7. Turn on the power.
8. A er 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 EZ Connect (2
unit link) 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 un l the water thaws. Check by opening the water supply valve.
4. Check the water heater and the piping for leaks.
42
To avoid burns, wait un l the equipment cools down before draining the water. The
water in the appliance will remain hot a er it is turned off.
Water
drain plug
Hot water
outlet
KB Series Manual
Cold water
Gas
inlet
connec on
Condensate
trap drain plug
ON!
COLD
0.1 gal/min or
about 0.2 inch
thick
HOT
Condensate
drain line