Flushing The Heat Exchanger; Cleaning The Heat Exchanger - Noritz NR501-OD Service Manual

< 2. Flushing the Heat Exchanger >
1. Open the Front Cover.
2. Connect the "blue connector*****" f
Connect
FLUSH
3. Then the code "CCC" is displayed on the Data Display.
4. Tu rn
for 1 hour at a rate of 1.5 gallons per minute or more.
5. The code "C60" is displayed on the Data Display when the wa
When 1 minute passes, the code "C60" will change to "C59" on the Data Display.
Please check whether the reverse connection of the hose (H1) and (H3) if the display number will not change.
In that case
6. When 1 hour passes, the code "C00"
Do not disconnect the "blue connector f
7. Tu rn
< 3. Cleaning the Heat Exchanger >
Below is the way to r
1. Remove both drain hoses (H2 and H3) from the bucket. And then place the drain hose (H3)
into the sink or outside to drain.
2. Close the drain valve (V3) and then open the water inlet valve (V1).
Do not open the fresh water outlet valve (V2).
3. Clean the water heater with fresh water for 3 minutes or more.
(Needs to ha ve enough time to clean the water heater.)
4. Close the drain valve (V4) and then remove the drain hose (H3)
from the drain valve (V4).
5. Remo ve the drain hose (H1) from the drain valve (V3).
6. Disconnect the "blue connector fo
The code "C00" goes out on the Data Display.
7. Close the Fr ont Cover.
8. Open the gas supply valve and water outlet valve (V2).
9 Check for correct operation of the water heater.
Please contact Noritz America if more information is needed fo
*****The connector is located behind
the Circuit Board Plastic Cover.
The connector color is blue and
labeled "FLUSH".
1 minute passes
ow
ow ay be under 1.5 gallons per minute.
" on the Circuit Board.
Flashing
p.
rinsed and cleaned out of the water heater.
" on the Circuit Board.
(Phone # : 866-766-7489)
58
.
(Ex . NRC711- DV )
water heater
ow of the
y.
Disconnect
FLUSH
The water heater can not operate
if the "blue connector" f
connected.
Data
Display