OPERATION
Appliance description
www.stiebel-eltron.com
WPL 10 AC | WPL 10 ACS |
5
3. Appliance description
3.1 Properties
The appliance is an air source heat pump for outdoor installation
that is designed to provide central heating. Heat is extracted from
the outdoor air at a low temperature level, and is then transferred
to the heating water at a higher temperature. The heating water
can be heated up to a flow temperature of 60 °C. The refrigerant
circuit is reversed for cooling operation.
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.
This appliance has further operational characteristics:
- Suitable for underfloor and radiator heating.
- Preferred for low temperature heating systems.
- Extracts heat from the outdoor air even at outside tempera-
tures of -20 °C.
- 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.
- Suitable for cooling through extraction of heat from the heat-
ing system.
Note
For centralised control over the entire heating system,
you would need the "WPM 3" heat pump manager.
3.2 Function
3.2.1 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). During this process, the refrigerant
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. Any hoarfrost is au-
tomatically defrosted. Water created from this defrosting process
collects in the defrost pan and is drained off via a hose.
In 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 or heating circuit. When operating without
buffer cylinder, observe the general conditions defined in chap-
ter "Installation / Preparations / Buffer cylinder". Otherwise the
heating water freezes under unfavourable conditions.
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.
3.2.2 Cooling
!
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
f
f
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 monitoring the dew point.
3.2.3 Heat pump application limit
The heat pump is switched off if the outside temperature falls
below the selected lower application limit for cooling (parameter
LIMIT COOLING).
4. Settings
The system is operated exclusively with the heat pump manager
(WPM 3).
f
f
Observe the heat pump manager operating and installation
instructions.
