1.5 Operating principle
The heat pump transmits the energy contained in the
surrounding air into the dwelling to be heated.
The heat pump consists of four main elements, in which
a refrigerant uid (R410A) circulates.
- In the evaporator (reference 13, gure 7, page 9) :
The energy is taken from the surrounding air and is
transmitted to the refrigerant. Because it has a low
boiling point, it changes from the liquid state to the
vapour state, even in cold weather (down to -15 °C
outdoor temperature).
- In the compressor (reference 10, gure 7, page 9) :
The vaporised refrigerant brought to high pressure
and takes on more calories.
- In the condenser (reference 14, gure 8, page 10) : The
energy in the refrigerant is transmitted to the heating
circuit. The refrigerant returns to liquid state.
- In the expansion valve (reference 9, gure 7, page 9) :
The liqueed refrigerant is brought back to low pressure
and returns to its initial temperature and pressure.
The heat pump is equipped with a controller, which
controls the room temperature based on the outdoor
temperature measurement and governed by the
temperature control. The room thermostat (option)
provides a corrective action for the temperature control.
The heat pump is equipped with an electrical back-up
system, which is designed to provide additional heat
during the coldest periods.
Legend:
• Regulation functions
- The heating circuit's initial temperature is controlled by
the temperature control.
- The power of the outdoor unit is modulated according
to ow heating temperature via the "inverter"
compressor.
- Control of the electric back-up heating (option).
- The daily timer program enables you to dene
the periods for comfortable or reduced ambient
temperature.
- Summer/winter mode switchover is automatic.
- Control of the supplementary boiler* (option).
- The room thermostat* provides a corrective action for
the temperature control.
- Domestic hot water* : Heating time programme, control
of the operation of the DHW circulation pump.
* If the heat pump is equipped with optional equipment and
the associated kits.
• Protection functions
- Anti-legionella cycle for domestic hot water.
- Frost protection : Frost protection cuts in if the
low-temperature point of the heating circuit falls
below 5 °C.
gure 8 - Hydraulic unit components
2
1
4 3 11
7
6
58
9
10
13
14
12
Front view
Side view
Installation and operation manual "1397 - EN"
Heat pump split single service alféa Evolution
- 10 -
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