Rinnai RUCS65i series, Installation And Operation Manual

Page: 61 / 132

KCM Series Manual 61
Water Heater
Pressure Relief Valve
3/4" Ball Valve
3/4" Union
Check Valve
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
KEY
Gas
Supply
V1
V3
V2
V4
H1
H2
H3
Circulating Pump
Cold
Water
Line
Ho t
Water
Line
n-line
Filter
I
Rinnai
e to flush the appliance will cause damage to the heat
exchanger. Damage caused by lime build-up is not covered b
9 (without a contoller, "LC" will display on status monitor) or 54
e heat exchanger.
1. Disconnect electrical power to the water heater.
2. Close the shutoff valves on both the hot water and
cold water lines (V3 and V4).
3. Connect pump outlet hose (H1) to the cold water
line at service valve (V2).
4. Connect drain hose (H3) to service valve (V1).
5. Pour 4 gallons of undiluted virgin, food grade, white
vinegar into pail.
6. Place the drain hose (H3) and the hose (H2) to the
7. Open both service valves (V1 and V2) on the hot
water and cold water lines.
8. Operate the pump and allow the vinegar to circulate
through the water heater for at least 1 hour at a rate
of 4 gallons per minute (15.1 liters per minute).
9. Turn off the pump.
10. Rinse the vinegar from the water heater as follows:
a. Remove the free end of the drain hose (H3) from
the pail. Place in sink or outside to drain.
b. Close service valve, (V2), and open shutoff valve,
(V4). Do not open shutoff valve, (V3).
c. Allow water to flow through the water heater for
5 minutes.
d. Close shutoff valve (V4). When unit has finished
draining remove the in-line filter at the cold water
inlet and clean out any residue. Place filter back
into unit and open valve (V4).
e. Close service valve, (V1), and open shutoff valve,
(V3).
Flushing the Heat Exchanger
11. Disconnect all hoses
12. Restore electrical power to the
water heater.
Following flush procedure call
technical assistance (1-800-621-
9419
)