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maintenance and cleaning
15.5 Descaling the electric emergency/booster
heater
Only descale the flange of the electric emergency/booster heater
after removing it, and never treat the interior of the DHW cylin-
der and the impressed current anode with descaling agents. The
electric emergency/booster heater is inserted centrally from above
into the DHW cylinder of appliance.
1
1 Electric emergency/booster heater with protective anode
15.6 Protective anode
The flange of the electric emergency/booster heater is equipped
with a protective anode that protects the appliance from corrosion
while it is connected to the power supply. The protective anode is
a maintenance-free impressed current anode.
If a fault code in the display indicates that the protective anode is
faulty, proceed as follows:
f Remove the controller of the electric emergency/booster
f
heater.
f Check the protective anode and its wiring.
f
f Refit the controller of the electric emergency/booster heater.
f
15.7 Valves
Regularly check the valves in the system (safety valve, pressure
reducing valve, drain valve) to ensure the operational reliability
of the appliance. The amount of limescale deposits depends on
the local water quality.
f Check all valves in the system and remove limescale deposits.
f
f Replace the valves if necessary.
f
f Check the function of the valves.
f
15.8 Condensate drain
f Check whether the condensate drain is clear of obstructions.
f
Remove contaminants.
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| SHP-A 220-300 Plus
15.9 Replacing the power cable
WARNING Electrocution
If the power cable is faulty, replace it with a new one.
The power cable should only be replaced by a qualified
contractor (connection type X).
15.10 Fitting the casing ring
WARNING Electrocution
f Reconnect the earth cable to the casing ring.
f
f Fit the upper casing ring. The casing ring overlaps along the
f
joint. A tab on one end clips into the recess at the other end
of the casing ring.
f Secure the casing ring with screws.
f
f Fit the pipe collar of the condensate drain and the conden-
f
sate drain bend.
15.11 Fitting the appliance cover
WARNING Electrocution
f Reconnect the earth cable to the appliance cover.
f
f Place the cover back on the appliance.
f
f Press the cover into the bead around the casing ring.
f
f Connect the cable linking the programming unit to the PCB
f
inside the appliance at the back of the control fascia.
f Insert the control fascia.
f
f Use the screw to secure the control fascia at the top of the
f
appliance.
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