Emergency Shutdown; Maintenance And Care - Stiebel Eltron Accelera 220 E Funcionamiento E Instalación

OPERATION

Maintenance and care

5.5.2 Emergency back up mode
If the heat pump is out of order, it is possible to use the electric
booster element in backup mode to ensure hot water production.
The compressor is disabled automatically if the thermostat mea-
sures a temperature increase less than 0.5 °F (0.25 °C) in a time
frame of 13 hours despite there being a demand. This action is
taken to recognize a fault in the heat pump circuit and alert the
user of the fault as soon as possible. In this case the fault code "8"
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 7.1, "Fault codes", pg. 17). The fault key continues
to fl ash. The electric booster element is activated.
The current set temperature (set temperature 1 or set temperature
2) is ignored. In emergency mode, the appliance operates with a
fi xed set temperature of 104 °F (40 °C). After a one-off activation
of the function via the rapid heating key, this function remains
active for 7 days.
Following 7 days of backup operation, the electric booster ele-
ment is deactivated. The fault code shown on the display again
fl ashes "8".
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 fresh 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 triggers the 48 hour heating mode
(See 5.5, "Rapid heating key", pg. 14).
An interruption of the power supply will disable the backup mode
immediately. The heat pump will try to heat again after power is
restored. If the heat pump is still out of order the emergency back
up mode can be reactivated after 13 hours.
5.6

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.
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6. 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.
Accelera® 220-300 E | 15