Panasonic WH-SDC07C3E5, Service Manual

Page: 88 / 166

88
16 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
• Check for correction operation of pressure relief valve by turn up the lever to become horizontal. (Refer to figure below)
• If you do not hear a clacking sound (due to water drainage), contact your local authorized dealer.
• Turn down the lever after checking finish.
• 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.
• Push the “TEST” button on the RCCB. The lever would turn down and indicate “0” and indicate green colour if it functions
normal.
• Contact authorized dealer if the RCCB malfunction.
• Turn off the power supply to the indoor unit.
• If RCCB functions normal, set the lever to “ON” again after testing finish.
5. How to release the trapped air in water circuit
• 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.
• Repeat it until the bubbling sound disappear.
Becareful not to touch parts other than RCCB test button when the power is supplied to Indoor Unit. Else, electrical shock may
happen.