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OPEraTiON
appliance description
www.stiebel-eltron.com
WPL E | WPL cool |
5
3. Appliance description
The appliance is an air | water heat pump that oper-
ates as a heating heat pump. The appliance extracts heat
from the outdoor air at a low temperature level and trans-
fers it to the heating water at a higher temperature level.
The heating water can be heated up to a flow temperature of 60 °C.
With the appropriate accessories, this appliance may be installed
internally or externally.
The appliance is equipped with an electric emergency/booster
heater (DHC). If the dual mode point is undershot in mono mode
operation, the electric emergency/booster heater is activated to
safeguard heating operation and the provision of high DHW tem-
peratures. In such a case in mono energetic operation, the electric
emergency/booster heater is activated as a booster heater.
Additional features
- Suitable for underfloor and radiator heating systems
- Preferred for low temperature heating systems
- Still extracts heat from the outdoor air at – 20 °C outside
temperature
- Corrosion-protected, external casing made from hot-dipped
galvanised sheet steel plus stove-enamelled finish
- Comprises all components and safety equipment required for
operation
- Filled with non-combustible safety refrigerant
Note
To control the heating system, you will need the WPM
heat pump manager.
3.1 Function
3.1.1 Heating
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The refrigerant evaporates and is
compressed by a compressor. This process requires electrical
energy.
The refrigerant is then at a higher temperature level and transfers
the heat drawn from the air to the heating system via an additional
heat exchanger (condenser). The refrigerant then expands and the
cycle begins again.
At air temperatures below approx. 7 °C, the humidity in the air
condenses as hoarfrost on the evaporator fins. This hoarfrost is
automatically defrosted. Water created by this defrosting process
collects in the defrost pan and is drained off via a hose.
During the defrost cycle, the fan is switched off and the heat pump
circuit is reversed. The heat required for defrosting is drawn from
the buffer cylinder. The heat pump automatically reverts to heating
mode at the end of the defrost cycle.
!
Material losses
In dual mode operation, return water from the second
heat generator may flow through the heat pump. Please
note that the return temperature must be no higher than
60 °C.
3.1.2 Cooling (WPL cool only)
!
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
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Observe the application limits (see chapter "Specifi-
cation / Data table").
Rooms are cooled by reversing the heat pump circuit. Heat is
extracted from the heating water and the evaporator transfers
this heat to the outdoor air.
Area cooling requires the installation of the FEK remote control
unit in a reference room to capture the relative humidity and the
room temperature as part of dew point monitoring.
Heat pump application limit
The heat pump is switched off if the outside temperature falls
below the selected lower application limit for cooling (LIMIT COOL-
ING parameter).
4. Settings
The appliance is controlled with the heat pump manager and re-
quires no special operation.
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Please observe the heat pump manager operating and instal-
lation instructions.
5. Maintenance and care
!
Material losses
Maintenance work, such as checking the electrical safety,
must only be carried out by a qualified contractor.
Note
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Keep the air discharge and intake apertures free
from snow and leaves.
A damp cloth is sufficient for cleaning all plastic and sheet metal
parts. Never use abrasive or corrosive cleaning agents.
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Protect the appliance from dust and dirt during building
work.
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Every month, check that the condensate drain is working
correctly (visual inspection). When doing so, check for water
collecting below or next to the appliance. For further infor-
mation, see chapter "Troubleshooting".
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance by a qualified contractor if
required (to return the system to its original condition).