OPEraTION
Safety
www.stiebel-eltron.com
WPL 15 IKS | WPL 25 IK |
5
2. Safety
2.1 Intended use
The appliance is used for heating rooms and domestic hot water.
Observe the application limits listed in the chapter „Specification /
Data table“.
The appliance is intended for domestic use, i.e. it can be used
safely by untrained persons. The appliance can also be used in a
non-domestic environment, e.g. in a small business, as long as it
is used in the same way.
Any other use beyond that described shall be deemed inapprop-
riate. Observation of these instructions and of instructions for any
accessories used is also part of the correct use of this appliance.
Any changes or conversions to the appliance void any warranty.
2.2 General safety instructions
Observe the following safety instructions and regulations.
- Only qualified contractors should carry out the electrical
work and installation of this appliance.
- The authorised contractor is responsible for adherence to
all currently applicable instructions during installation and
commissioning.
- Operate the appliance only when fully installed and with all
safety equipment fitted.
- Protect the appliance from dust and dirt ingress during buil-
ding work.
- The DHW cylinder is at mains water pressure. If no dia-
phragm expansion vessel is installed, expansion water may
drip from the safety valve during heat-up.
- Notify your contractor if water is still dripping from the safety
valve after the heat-up process.
WARNING Burns
There is a risk of scalding at outlet temperatures in
excess of 43 °C.
!
DANGER Injury
The appliance may be used by children aged 8 and up
and persons with reduced physical, sensory or mental
capabilities or a lack of experience provided that they
are supervised or they have been instructed on how to
use the appliance safely and have understood the re-
sulting risks.
!
WARNING Injury
f
f
For safety reasons, only operate the appliance with
the casing closed.
3. Appliance description
The appliance comprises an internal unit (heat pump module) and
an external unit (evaporator module).
These two units are connected by refrigerant lines.
The external unit is designed for external installation and extracts
low grade heat from the ambient air.
The extracted energy together with the energy drawn by the vari-
able speed compressor is transferred to the heating water inside
the internal unit.
The heating water then transfers the heat to the heating system or
to the DHW via a three-way valve. As a result, flow temperatures
of 65 °C can be achieved.
The appliance is equipped with an electric emergency/booster
heater. In mono mode operation, the electric emergency/booster
heater is activated when the dual mode point can no longer be
maintained, in order to safeguard heating operation and the pro-
vision of high DHW temperatures. In mono energetic mode, the
electric emergency/booster heater is activated as a booster heater.
Mode of operation
The heat exchanger on the air side (evaporator) is fitted in the
external unit. It extracts heat from the outdoor air at temperatures
ranging from +40 °C to -20 °C.
In the heat exchanger on the water side (condenser) the heating
water is heated up to the flow temperature using electric power
(compressor).
At air temperatures below approx. +7 °C, the humidity in the air
precipitates as hoarfrost on the evaporator fins. Any hoarfrost is
automatically defrosted. Water created from defrosting collects in
the condensate pan and drains off below the external unit.
Control unit
The system is regulated by an integral, weather-compensated
return temperature control unit (WPMme). The return temperature
control maintains DHW heating at the required temperature level.
The return temperature control is combined with inverter tech-
nology. Thanks to this control technology, the compressor output
is matched to the outside temperature and the heat demand of
the building.
This prevents the compressor from being subjected to frequent
cycling, particularly in spring and autumn. Consequently, the aver-
age flow temperature is lowered, leading to higher efficiency and
seasonal performance factor.
The status of the signal anode is shown by a red signal indicator
beneath the heat pump manager.