RU130EP Installation and Operation Manual

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HOT

COLD

ON!

Cold Drain

Valve

Cold Isolation

Valve

PRV Lever

Hot Isolation

Valve

Hot Drain

Valve

Condensate

Trap Drain Plug

Condensate

HOT

PRV

COLD

Figure 77: Piping Diagram

Rinnai Tankless Water Heater Installation and Operation Manual 81

6.4 Draining 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 o󰀨.

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 o󰀨 cold water supply and gas supply.

2. Turn o󰀨 the temperature controller.

3. Disconnect the power to the water heater.

4. Close the hot and cold isolation valves.

5. Open the pressure relief valve (PRV) lever.

6. Open the hot and cold drain valves.

7. Remove the condensate trap drain plug and

allow to drain.

To resume normal operation:

1. Conrm that the gas supply is turned o󰀨, all

taps are closed and PRV lever is closed.

2. Insert the condensate trap drain plug.

3. Close the hot and cold drain valves.

4. Open the cold and hot water isolation valves.

5. Open a tap and conrm that water ows, and

then close.

6. Connect power to the water heater.

7. After conrming 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 EZConnect™ (2-unit link) should be drained

to prevent freezing if not in use.

1. Turn the water heater o󰀨 and close the gas

supply valve.

2. Turn on a hot water tap to ow water about 0.1

gal/min (0.4 L/min) or where

the stream is about 0.2 in. (5

mm) thick.

When the water heater or

external piping has frozen:

1. Do not operate the water heater if the unit or

the external piping is frozen.

2. Close the gas and water valves and turn o󰀨

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.

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Installation and Operation Manual - Page 81