BA_OCHSNER AIR EAGLE_414_717_V06_EN.docx Page 6 of 76
2.4 Function
Heat is extracted from the outdoor air via the
heat exchanger (evaporator) on the air side. The
refrigerant is evaporated and compressed by a
compressor. This requires electrical energy. The
refrigerant is now at a higher temperature level
and releases the heat from the air to the heating
system via another heat exchanger (condenser).
During this, the refrigerant expands and the
process begins again. At air temperatures below
approx. + 7 °C air humidity condenses as ice on
the evaporator fins. This ice is automatically
removed (defrosting). In the defrost phase, the
fan shuts down and the heat pump circuit is
reversed. The heat required for defrosting is
drawn from the buffer tank or the heating circuit.
At the end of the defrost phase the heat pump
automatically returns to heating mode.
2.5 System overview
The heat pump consists of a split outdoor unit and
an indoor unit which is installed in the boiler room.
The connection to the heating system is made via
the flow and return of the heat sink side of the
heat pump.
Figure 1: System overview
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