Rinnai HDC 1600i Low NOX Installation And User Manual page 58

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.
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 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.
3 Screw in the water drain plugs avoiding over-tightening.
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 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 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 0.4 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.
MAINTENANCE
58
Gas
Water drain
connection
plug
Hot water
Condensate trap
outlet
drain plug
ON!
COLD
HOT
Cold water
inlet
Condensate
drain line
0.4 l/min or
about 5 mm
thick