Maintenance Guide - Panasonic WH-MHF12G9E8 Service Manual

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 boiler tank installation instruction for details on how to add water.
2. Pressure relief valve
Take out the cover
o
Check for correction operation of pressure relief valve by turn up the lever to become horizontal.
o
(Refer to figure of "Pressure relief valve")
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
o
authorized dealer.
Reinstall the cover
o
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. 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 Mono bloc unit.
This testing could only be done when power is supplied to the Mono bloc unit.
with remove the mounting screw for access to the pressure relief valve.
with tighten the mounting screws properly, if the pressure relief valve is functioning
Lever
Turn up
Pressure relief valve
Plug (turn
anticlockwise
by one
complete
turn)
Air purge valve
13
Mounting
screws
Pressure
relief valve
82