RU130EP Installation and Operation Manual

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Figure 76

Rinnai Tankless Water Heater Installation and Operation Manual 80

6.3 Flushing the Heat

Exchanger

This water heater includes a service indicated/

reminder (Service Soon, SS). When selected in

the parameter settings, an SS code will display

on the controller indicating that it is time to ush

and service the water heater. Failure to ush

the appliance will cause damage to the heat

exchanger. Damage caused by lime build-up is

not covered by the water heater’s warranty. Rinnai

strongly recommends installation of isolation

valves to allow for ushing of the heat exchanger.

1. Turn o󰀨 power at the controller.

2. Disconnect electrical power to the water

heater.

3. Close the shuto󰀨 valves on both the hot water

and cold water lines (V3 and V4).

4. Connect pump outlet hose (H1) to the cold

water line at service valve (V2).

5. Connect drain hose (H3) to the hot water line

at service valve (V1).

6. Pour four gallons of undiluted virgin, food

grade, white vinegar into pail.

7. Place the drain hose (H3) and the hose (H2)

to the pump inlet into the cleaning solution.

8. Open both service valves (V1 and V2) on the

hot water and cold water lines.

9. Operate the pump and allow the vinegar to

circulate through the water heater for at least 1

hour at a rate of four gallons per minute (15.1

liters per minute).

10. Turn o󰀨 the pump.

11. Rinse the vinegar from the water heater as

follows:

E. Remove the free end of the drain hose (H3)

from the pail. Place in sink or outside to

drain.

F. Close service valve (V2) and open shuto󰀨

valve (V4). Do not open shuto󰀨 valve (V3).

G. Allow water to ow through the water heat-

er for ve minutes.

H. Close shuto󰀨 valve (V4). When unit has

nished draining remove the in-line lter

at the cold water inlet and clean out any

residue. Place lter back into unit and open

valve (V4).

I. Close service valve (V1) and open shuto󰀨

valve (V3).

12. Disconnect all hose

13. Restore electrical power to the water heater.

Scale build-up will a󰀨ect the performance of the

water heater. Water should be treated. Rinnai

o󰀨ers Southeastern Filtration’s “ScaleCutter

Water Conditioning System” that o󰀨ers superior

lime scale prevention and corrosion control by

feeding a blend of scale control compounds into

the cold water supply.

NOTE

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Installation and Operation Manual - Page 80