Noritz GQ-C2857WS-FF US Installation Manual page 29

1. Connect the blue connector marked "FLUSH" for unit needing to be flushed.
(The water heater is isolated from Quick Connect Multi system when the "blue connector
for flushing" is connected. Not need to disconnect the
Sub Water Heater
Quick Connect Cord
Do not need to disconnect.
2.Then the code "CCC" or "FCC" is displayed on the
CCC
is displayed when the Main Water Heater's blue connector is connected.
FCC
is displayed when the Sub Water Heater's blue connector is connected.
3. Turn on the circulating pump to circulate the flushing solution through the water heaters
for 1 hour at a rate of 1.5 gallons per minute or more.
(LED light is flashing while flushing the heat exchanger. See the "
4. When 1 hour passes, the code "C00" is flashing on the Remote Controller.
Do not disconnect the blue connector marked "FLUSH" for flushing.
Detects the flow
CCC
Detects the flow
FCC
(Ex. : The display when the both water heaters are flushed at the same time.)
Connect
Main Water Heater's
Blue Connector
The remaining time of flushing gives indication priority to the connector which is connected later.
5. Turn off the circulation pump.
6. Rinse and clean the flushing solution out of the water heaters in accordance with "
(See the "
7. Disconnect the blue connector marked "FLUSH" for flushing.
The Code "C00" goes out on the Remote Controller.
8. Close the Front Covers.
9. Open the gas supply valves and water outlet valves.
10. Check for correct operation of the water heaters.
Main Water Heater
Manifold Plate
C60
C60
Detects the flow
CCC C50
10 minutes pass
". )
Water
Drain Valve
Connect Cord.)
Circuit Board
Remote Controller
. . .
C59
. . .
C59
Connect
FCC
Sub Water Heater's
Blue Connector
NOTE : Place a bucket under the water heater to
drain water from the "Water Drain Valve".
Carefully unscrew the "Water Drain Valve"
to rinse flushing solution out of the water
heater for about 10 seconds, then close
the "Water Drain Valve".
Connect
FLUSH
".)
C00
Flashing
C00
Flashing
1 hour passes
Detects the flow
C60
C00
Flashing
" .
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