91
is subject to the water quality and temperature. A lower water temperatures, the ac
-
tive anode is consumed less.
9.4. Descaling
Depending on the quality and quantity of the water used, scale deposition may occur
on the heater exchanger or the tank walls. The scale deposited on the heater decreas
-
es the heating efficiency. Therefore, it is necessary to descale the hot water tank every
two years.
It is forbidden to apply any sharp metal object or acid to remove scale deposited on
the heat exchanger, the closing cover and its fittings. Please, use commercially distrib
-
uted cleaning and descaling supplies.
Scale can be removed from the interior of the tank manually, through the service
opening. After the removal of scale, it is recommended to flush the tank using water
jet.
9.5. Prevention of frost damage
If the temperature in the room hosting the hot water tank may fall below the freezing
point, the heating of the tank must not be switched off during frost danger periods,
otherwise the tank must be emptied.
9.6. In case of indirect heating
OVERHEATING PROTECTION MUST BE ENSURED USING
THE INDIRECT HEATING EQUIPMENT!
9.7. Stoppages not caused by faults
a)
3-minute protection
When the appliance is powered, you have to wait 3 minutes with an immediate re
-
start after a stoppage, in order to protect the compressor.
b)
If the appliance launches a self-protection mechanism and shuts down,
please, check the following:
When the power indicator lights up, the appliance may not yet fulfil all of the sys
-
tem start-up conditions when being switched on. You should check the air outlet
and inlet for clogging to prevent strong draughts from reaching the air outlet.
c)
Defreezing
The evaporator may freeze in a wet and cold environment, which can reduce the
water heating performance. In such cases, the appliance is set to stop water heat
-
ing, switches to defreezing and starts water heating only then.
During defreezing, the fan stops, the four-way valve turns the flow direction and
the compressor runs continuously.
Defreezing may last from 3 to 10 minutes, depending on the external environ
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