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3-6 Replacement of Neutralizer
[Replacement of neutralizer]
[Replacement of Memory PCB]
1. Unplug power supply cable.
2. Disconnect the drain pipe at the bottom of the
Water Heater.
3. Unhook the lead wires.
4. Disconnect the Water level electrode 2P
connector, the Anti-Frost heater 2P relay
connector and the outgoing temperature
sensor connector.
5. Pull out the rubber hose from the Neutralizer
removing the hose band.
6. Remove the setscrew of Manifold Assy.
7. Pull up and remove the Neutralizer.
8. Attach the new Neutralizer.
9. Put the setscrew of Manifold Assy and the
rubber hose back into place.
1.
Unhook the lead wires from the PCB claw and then, remove the setscrew fixing the PCB case.
2. Pull the PCB forward. (It’s not necessary to remove it.)
3.
Remove the Memory PCB from the PCB and attach the new Memory PCB (MC-31) on the PCB.
4.
Put the PCB back into place. Fix the PCB case with setscrew and hang the lead wires
on the claw.
5.
Plug power supply cable.
6.
Run water to the unit and check the normal combustion.
Note:
-Make sure to unplug power supply cable when the Memory PCB is removed from the PCB
and is attached on the PCB. It can cause the damage of the data in the Memory PCB.
-The data for setting of the unit is stored on the Memory PCB. Be careful to keep it from
being affected by humidity, impact or static electricity.
Rubber hose
Anti-Frost heater
2P relay connector
Water level electrode
2P connector
Setscrew of Manifold Assy
Procedure
CAUTION
In replacing the Neutralizer, the Memory PCB must be replaced at the same time.
The Memory PCB has the life-record of Neutralizer.
10. Reconnect the connectors disconnected at
“Step 4’’ and hang the lead wires on the hook
of Neutralizer.
