OPERATION
OPERATION
4 |ACCELERA 300/WHP 300 WWW.STIEBEL-ELTRON.COM
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3.2.2 Electric booster heater
If there is a higher demand of hot water or when the appliance was
switched OFF for a long time and you require hot water quickly,
you can accelerate the heat-up process by means of the electric
booster heater. For reasons of saving energy, the electric booster
heater will only heat up approximately 100 litres of water in the
upper section of the cylinder.
The control thermostat of the electric booster heater is preset
to 60°C and will be restarted when the DHW temperature falls
below 45°C. This safeguards not only that primarily the appliance
provides hot water, but also that you enjoy a high level of DHW
convenience when large amounts of hot water are drawn.
3.3 Operation with passive defrost feature
The limit of application of the appliance (without hot gas defrost
feature) is set to 6°C.
However, with this limit of application, the evaporator may build
up hoar frost subject to air temperature and relative humidity,
particularly when the DHW temperature is low. The compressor
will be switched OFF as soon as the evaporation temperature lies
below -7°C for any length of time. When the temperature at the
evaporator fins rises above 3°C, the compressor are started again,
and the DHW heating continues.
4. Operation
This appliance is a domestic hot water (DHW) generator that
operates automatically and has a capacity of approximately 300l.
The water temperature is permanently set to 60°C.
Risk of scalding. There is a risk of scalding at outlet
temperatures in excess of 43°C.
The appliance is installed, connected and handed over ready for
use by a qualified contractor. Nevertheless, you should familiarise
yourself with the most important technical features of your
appliance.
5. Maintenance and cleaning
The appliance is generally maintenance free, with the exception
of cleaning the strainer in the condensate drain.
Sand and dust can result in sludge building up inside the strainer.
Therefore, clean the strainer at least twice per annum or in
accordance with demand.
A damp cloth is sufficient for cleaning all plastic parts. Never use
scouring or solvent-based cleaning agents.
!
Please note: Maintenance work, e.g. checking the elec-
trical safety, must only be carried out by a qualified
contractor.
— Check the condensate drain at least monthly at the bottom
strainer outlet and at the top condensate pan drain (visual
check). Remove contaminants and blockages immediately.
— For this appliance, it is recommended that the electric booster
heater be descaled from time to time. this will result in prolon-
ged life fo the electric booster.
— Your local contractor, who is familiar with the local water quality,
should identify for you the timing of the next service.
— Ask your local contractor to regularly check the safety assembly
and the electric booster heater.
— The appliance is subject to mains water pressure. The expan-
sion water drips from the safety valve during heat-up. Inform
your local contractor of water drips from the system after the
heat-up process has ended.
— To protect the steel cylinder against corrosion, the interior is
coated with a special enamel and is furthermore equipped
with a protective anode. Ask your local contractor to check the
protective anode regularly.
6. What to do if ...
6.1 No hot water
Should you fail to obtain hot water at any time, you can take the
following steps to remedy that situation.
No electrical power:
» Check the fuse/circuit breaker in your fuse box. If it has blown/
tripped, replace/reset the fuse/MCB. If it should blow/trigger
repeatedly, notify your local contractor.
Still no hot water, even though electrical power is available:
» Check, whether the air inlet/outlet is blocked.
Thermo switch/high limit safety pressure limiter:
The thermoswitch trips out or the high limit safety pressure limiter
switches the compressor OFF if the compressor is overloaded due
to excessive ambient temperature or excessive air temperature
(>42°C), or because of a fault in the refrigerant circuit. Ask your
local contractor to remove the fault.
The thermoswitch automatically switches itself ON again.
!
The high limit safety pressure limiter must only be reset
by your contractor after he has removed the cause of
the relevant fault.
6.2 Other issues
Safety valve of the cold water supply line drips:
This may occur during the heat-up phase and is completely nor-
mal.
The condensate drain drips:
This always happens when the surface temperature of the
evaporator is lower than the ambient dew point temperature.
To high electric power consumption:
Reduce the set point temperature of the control thermostat, or/and
increase the set point of the heat pump control thermostat.
For all other faults, consult your contractor.
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