Maintenance Guide - Philips WH-UD16CE5-A-1 Service Manual

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.
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
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to figure below)
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
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authorized dealer.
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 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.
5 RCCB/ELCB
Ensure the RCCB/ELCB set to "ON" condition before check RCCB/ELCB.
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.
Push the "TEST" button on the RCCB/ELCB. The lever would turn down and indicate "0" and indicate
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green colour if it functions normal.
Contact authorized dealer if the RCCB/ELCB malfunction.
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Turn off the power supply to the indoor unit.
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If RCCB/ELCB functions normal, set the lever to "ON" again after testing finish.
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WARNING
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