Panasonic WH-MXF09D3E8, Service Manual

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15. Maintenance Guide
In order to ensure optimal performance of the unit, seasonal inspections on the unit, external filter and field wiring
have to be carried out at regular intervals. This maintenance should be carried out by authorized dealer.
1. Water pressure
Water pressure should not lower than 0.05 MPa (with inspects the pressure gauge). If necessary add tap
water into tank unit. Refer to tank unit installation instruction for details on how to add water.
2. Pressure relief valve
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Take out the cover with remove the mounting screw for access to the pressure relief valve.
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Check for correction operation of pressure relief valve by turn up the lever to become horizontal. (Refer
to figure of “Pressure relief valve”)
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If you do not hear a clacking sound (due to water drainage), contact your local authorized dealer.
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Turn down the lever after checking finish.
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In case the water keeps drained out from the unit, switch off the system, and then contact your local
authorized dealer.
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Reinstall the cover with tighten the mounting screws properly, if the pressure relief valve is functioning
normal.
3. Air purge valve
Air purge valve must be installed at all high points in a closed water circuit system.
An automatic air purge valve is provided inside the indoor unit. To automatically purge the air from the
system, turn the plug on the air outlet anticlockwise by one complete turn from fully closed position.
Excessive air is automatically purged if the plug is kept in this position.
4. RCCB
Ensure the RCCB set to “ON” condition before check RCCB.
Turn on the power supply to the Mono bloc unit.
This testing could only be done when power is supplied to the Mono bloc unit.
WARNING
Be careful not to touch parts other than RCCB test button when the power is supplied to Mono bloc unit. Else, electrical shock may
happen.
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Push the “TEST” button on the RCCB. The lever would turn down and indicate “0”, if it functions normal.
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Contact authorized dealer if the RCCB malfunction.
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Turn off the power supply to the Mono bloc unit.
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If RCCB functions normal, set the lever to “ON” again after testing finish.