hajdu HB300C Manuel De Mise En Service, D'opération Et D'entretien page 93

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Scale can be removed from the interior part of the tank manually, through the
fitting opening. It is rationale to flush the tank with water ray after scale removal.
10.8. Prevention of frost damages
If temperature may fall below the freezing point in the location of the hot water
tank, the heating of the tank must not be switched off or the tank must be discharged
in periods of frost danger.
10.9. In case of indirect heating
OVERHEATING PROTECTION MUST BE PERFORMED BY THE INDIRECT
10.10. Air filter
Clean the air duct every month as this influences heating
performance!
If the filter has been mounted directly into air inlet (i.e. air inlet is not
connected to air duct), dismounting and cleaning of the filter can be performed in the
following way: the air inlet closing ring has to be turned counter-clockwise, the filter
must be removed and perfectly cleaned and then it must be put back to its place.
10.11. Shutdowns not caused by errors
a) 3-minutes protection
When the appliance is under power, one must wait 3 minutes to protect the
compressor at immediate start-up after shutdown.
b) If the appliance launches a self-protection mechanism and then
shuts down, please check the following:
When the power indicator lights up, it may happen that the appliance does not
fulfil all the conditions for system start up when being switched on. One should also
check that air inlet or air outlet are not blocked or no strong draught reaches the air
outlet.
c) Defreezing
The evaporator may freeze in a wet and cold environment, so it can reduce water
heating performance. This time, the appliance is set to stop water heating, changes to
defreezing and starts water heating only then.
During defreezing, the fan stops, the four-direction valve turns the way of flow and
the compressor is operating continuously.
Defreezing may range from 3 minutes to 10 minutes, depending on the external
environment and the frost.
d) Temperature display
When the appliance stops, temperature decrease due to heat release is quite
normal. The system is started automatically after falling back to a certain heat degree.
During water heating, the indicated water temperature may decrease for a while or
it can not increase due to heat exchange of the water. When the tank has fully reached
the pre-set temperature, the appliance stops automatically.
10.12. Errors and solutions
Malfunctioning
The outlet water is
cold. The display is
dark.
HEATING EQUIPMENT!
Reason
Check whether power supply
exists
Solutions
Set outlet water at a higher
temperature;
Contact the technician.