STIEBEL ELTRON Accelera 300 E - Manual (Page 24)

24 | Accelera® 220-300 E www.stiebel-eltron-usa.com
INSTALLATION
Maintenance and cleaning
14.3 Cleaning the evaporator
!
WARNING Injury
The evaporator consists of numerous sharp-edged fi ns.
Be careful during cleaning the evaporator and wear pro-
tective clothing, especially safety gloves.
The evaporator fi ns are coated with a hydrophilic coating to reduce
corrosion and to eliminate surface tension on condensed water
droplets. This creates a self-cleaning action so minimal cleaning
is necessary. Nevertheless, the evaporator should still be checked
for contamination and corrosion and cleaned as necessary.
Undo the screw that secures the appliance cover at the upper side
of the control panel.
  Remove the control panel and the appliance cover.
  Carefully clean the evaporator fi ns. Use water and a soft
brush for this. Never use acidic or alkaline cleaning agents.
14.4 Draining the tank
WARNING Burns
Hot water may escape when draining the DHW tank.
To drain the DHW tank, e.g. when shutting the appliance down,
proceed as follows:
  Unplug the appliance from the power supply.
  Close the shut-off valve in the cold water supply line.
The DHW tank is drained via the cold water supply line.
  Open the drain valve installed in the cold water supply line
(See 10.1, “Water connection”, pg. 19). If no drain valve
has been installed, undo the cold water supply line at the
“cold water inlet” connection.
  Open one tap in one sink.
Some residual water will remain in the lower section of the DHW
tank.
14.5 Descaling the electric booster element
Only descale the fl ange of the electric booster element after re-
moving it, and never treat the interior of the DHW tank and the im-
pressed current anode with descaling agents. The electric booster
element is screwed into the appliance at a central point at the top.
D00000
34
79
9
1
1 Electric booster element with protective anode
14.6 Protective anode
The fl ange of the electric booster element 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:
  Remove the controller of the electric booster element.
  Check the protective anode connector and its wiring.
  Refi t the controller of the electric booster element.
14.7 Valves
Regularly check the system's valves (safety valve, pressure reduc-
ing valve, drain valve, vacuum breaker, mixing valve), to ensure the
operational reliability of the appliance. The amount of lime-scale
deposits depends on local water quality.
  Check all valves in the system and remove lime-scale
deposits.
  Replace the valves if necessary.
  Check the function of the valves.
14.8 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 qualifi ed
contractor.
14.9 Fitting the casing ring
WARNING Electrocution
  Reconnect the ground wire to the casing ring.