Emergency Shutdown; Maintenance And Care - STIEBEL ELTRON Accelera 220 E Operation And Installation Manual

OPERATION

Maintenance and care

The heat pump remains on and the comfort heating function re-
mains active until a temperature of 149°F/65°C) has been achieved
in the entire DHW tank (comfort heating). The appliance then au-
tomatically switches back to the previously set parameters.
Note
The electric booster element and heat pump symbols are
displayed until the comfort heating function has termi-
nated.
During comfort heating, the electric booster element
symbol is displayed until the heat pump has heated the
entire tank to 149°F/65°C and the function is terminated,
e ven though t he electric booster element switches off
when the 149°F/65°C) has been achieved in the upper
tank section.
Note
If comfort heating has been activated, it can be canceled
by reducing the set temperature.
 Hold down the minus key, until you hear a clicking 
noise caused by the heat pump and booster heater
switching off. The set temperature will jump back to
the value that was selected before comfort heating
was activated.
4.4.2 Emergency back up mode
If the heat pump is out of order, it is possible to use the electric
booster element in back up mode to ensure hot water production.
The electric supply to the compressor shuts down if the water
temperature increase is less than 0.5°F/0.25°C) in a time frame
of 13 hours. In this case the fault code is activated and will fl ash.
The fault key fl ashes on the display and a fault code indicates that
the appliance is not heating the water.
To activate the backup mode, press the rapid heating key. After
the rapid heating key has been pressed, the indicated fault code
increases by a value of 256, as the fault codes are summed to-
gether (See 6.1, "Fault codes", pg. 16). The fault key continues
to fl ash. The electric booster element is activated.
The current set temperature (set temperature 1 or set tempera-
ture 2) is ignored. In emergency mode, the appliance operates
with a fi xed set temperature of 104°F/40°C). After a one-off ac-
tivation of the function via the rapid heating key, this function
remains active for 7 days.
Following 7 days of backup operation, the electric booster element
is deactivated. The fault code shown on the display decreases by
256.
If the rapid heating key is pressed again within the 7 days of
backup operation, the 7-day run time for emergency mode will
start afresh from that point.
Pressing the rapid heating key only activates backup mode if a
fault with fault code 8 occurred previously. In standard mode
pressing the rapid heating key only triggers a one-off heating of
the DHW tank for a single instance.
An interruption of the power supply will disable the back up mode
immediately. The heat pump will try to heat again for a duration of
13 hours after the power outage. After 13 hours without a water
temperature increase, the fl ashing service key occurs again and
the back up function may be activated.
14 | Accelera® 220-300 E
4.5

Emergency shutdown

In the event of an emergency, carry out the following steps:
 Interrupt the power supply by unplugging the appliance or by 
shutting off the circuit breaker.
 Shut off the cold water supply. 
 Immediately notify a qualifi ed contractor, as the appliance 
is not protected against corrosion while the power supply is
interrupted.
 Drain the water out of the tank if there is a power outage 
longer than 2 days.
5. Maintenance and care
WARNING Electrocution
Do not insert objects through the grille into the interior
of the appliance.
Never spray the appliance with water.
Never spray water into the appliance.
WARNING Injury
!
Maintenance work, such as checking the electrical safe-
ty, must only be carried out by a qualifi ed contractor.
Appliance Care and maintenance tips
components
Casing Use a damp cloth to clean the casing sections. Never
use abrasive or corrosive cleaning agents.
Air intake grille / air Clean the air intake grille and air discharge grille
discharge grille every six months. Cobwebs or other kinds of contami-
nation can restrict the air supply to the appliance.
DHW tank The DHW tank is equipped with a maintenance-free
impressed current anode to safeguard against cor-
rosion. The power supply must not be interrupted
while the appliance is filled with water to enable the
impressed current anode to provide protection. Oth-
erwise there is a risk of corrosion.
Electric booster ele- Have the electric booster element descaled from time
ment to time. This will extend the expected life of the elec-
tric booster element.
Appliance Have the safety assembly and the evaporator checked
regularly by a qualified contractor.
Condensate drain Undo the condensate drain. Check that the condensate
drain is clear and remove any dirt from the conden-
sate drain connection of the appliance.
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