Panasonic WH-SDF16C9E8 [64/125] Maintenance guide

WARNING

15. Maintenance Guide

In order to ensure optimal performance of the unit, checks and inspections on the unit and the field wiring must be

carried out regularly. Please request a licensed technician for carry out maintenance job.

Before carried out any maintenance or repair work, and removing the front plate of heat exchanger unit, always

switch off all power supply (i.e. indoor unit power supply, heater power supply and sanitary tank power supply).

Below checks must be carried out at least once a year.

1 Water pressure

Water pressure should not lower than 0.05 MPa (with inspects the pressure gauge). If necessary add tap

water into boiler tank. Refer to boiler tank installation instruction for details on how to add water.

2 Pressure relief valve

o Check for correction operation of pressure relief valve by turn up the lever to become horizontal. (Refer

to figure below)

o If you do not hear a clacking sound (due to water drainage), contact your local authorized dealer.

o Turn down the lever after checking finish.

o In case the water keeps drained out from the unit, switch off the system, and then contact your local

authorized dealer.

3 Indoor unit control board area

Thorough visual inspection of the control board and look for defects, i.e. loose connection, melting of wire

insulator and etc.

4 RCCB

Ensure the RCCB set to “ON” condition before check RCCB.

Turn on the power supply to the indoor unit.

This testing could only be done when power is supplied to the indoor unit.

Becareful not to touch parts other than RCCB test button when the power is supplied to Indoor Unit. Else, electrical shock may

happen.

o Push the “TEST” button on the RCCB. The lever would turn down and indicate “0” and indicate green

colour if it functions normal.

o Contact authorized dealer if the RCCB malfunction.

o Turn off the power supply to the indoor unit.

o If RCCB functions normal, set the lever to “ON” again after testing finish.

5 How to release the trapped air in water circuit

o Turn up the lever to become horizontal. (Refer to figure “Pressure relief valve”). The trapped air will be

drained out together with water. After few seconds, turn down the lever to stop the water drainage.

o Repeat it until the bubbling sound disappear.

6 Reset overload protector

Overload protector serves the safety purpose to prevent the water over heating. When the overload protector

trip at high water temperature, take below steps to reset it.

a. Take out OLP cover.

b. Use a test pen to push the centre button gently in order to reset the Overload protector.