Giatsu WD2N8B Serie Manuel De L'utilisateur Et D'installation page 111

The following checks must be performed at least once a year by qualified person.
Water pressure
-Check the water pressure, if it is below 1 bar,fill water to the system.
Water filter
-Clean the water filter.
Water pressure relief valve
-Check for correct operation of the pressure relief valve by turning the black knob on the valve counter-clockwise:
If you do not hear a clacking sound, contact your local dealer.
In case the water keeps running out of the unit, close both the water inlet and outlet shut-off valves first and then
contact your local dealer.
Pressure relief valve hose
-Check that the pressure relief valve hose is positioned appropriately to drain the water.
Backup heater vessel insulation cover
-Check that the backup heater insulation cover is fastened tightly around the backup heater vessel.
Unit switch box
-Carry out a thorough visual inspection of the switch box and look for obvious defects such as loose
connections or defective wiring.
-Check for correct operation of contactors with an ohm meter. All contacts of these contactors must be in open
position.
Use of glycol (Refer to 9.3.4 "Water circuit anti-freeze protection").
Document the glycol concentration and the pH-value in the system at least once a year.
-A PH-value below 8.0 indicates that a significant portion of the inhibitor has been depleted and that more
inhibitor needs to be added.
-When the PH-value is below 7.0 then oxidation of the glycol occurred, the system should be drained and flushed
thoroughly before severe damage occurs.
Make sure that the disposal of the glycol solution is done in accordance with relevant local laws and regulations.
14 TROUBLESHOOTING
This section provides useful information for diagnosing and correcting certain troubles which may occur in the unit.
This troubleshooting and related corrective actions may only be carried out by your local technician.
14.1 General guidelines
Before starting the troubleshooting procedure, carry out a thorough visual inspection of the unit and look for obvious
defects such as loose connections or defective wiring.
When carrying out an inspection on the switch box of the unit, always make sure that the main switch of the
unit is switched off.
When a safety device was activated, stop the unit and find out why the safety device was activated before resetting it.
Under no circumstances can safety devices be bridged or changed to a valve other than the factory setting. If the cause
of the problem cannot be found, call your local dealer.
If the pressure relief valve is not working correctly and is to be replaced, always reconnect the flexible hose attached to
the pressure relief valve to avoid water dripping out of the unit!
WARNING
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