Domestic Hot Water Heat Pump Service Manual
59
11.4.2 Anode
In order to prevent corrosion of the enamelled hot water tank, a magnesium anode is installed
behind the front panel at the top half of the water tank.
The anode has a life expectancy of approximately 2-5 years depending on the water quality.
It is recommended to inspect the anode every year.
Disconnect the electrical power supply or pull out the power plug
Remove the plastic front cover. This allows access to the anode.
Disconnect the wire connection between the anode and the tank (se picture below).
Insert a multimeter (range mA) between the anode and the tank.
Anode current >0.3mA: Anode is active and ok.
Anode current <0.3mA: Anode should be checked and possibly be replaced.
Reconnect the wire connection between the anode and the tank. Close the front cover and
switch on the unit.
Figure 21
– Anode control
Please note that the water has to be heated to operational temperatures at least once before the
test above can be performed.
In order to replace the anode the following should be done:
Close the water inlet.
Connect a hose to the drain valve so the water from the water from the tank can run to the
nearest drain.
Open a hot water tapping point (to avoid vacuum in the water tank).
When the water level in the tank is below the anode, this can be removed for inspection and
replacement
Check and replacement of anode must be performed by skilled personnel.
