Operating Principle - Fujitsu AOYA18LALL Installation And Operating Manual

Heat pump, Split, single service
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Front view

Operating principle

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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 fluid (R410A) circulates.
- In the evaporator (rep. 13, fig 7, page 11): 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 outside temperature).
- In the compressor (rep. 10, fig 7, page 11): The
vaporised refrigerant brought to high pressure and
takes on more calories.
- In the condenser (rep. 15, fig 8, page 12): The
energy in the refrigerant is transmitted to the
heating circuit. The refrigerant returns to liquid
state.
- In the expansion valve (rep. 9, fig 7, page 11): The
liquefied 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 internal temperature based on the
outside temperature measurement and governed by
the temperature control.
The room thermostat (optional) provides a corrective
action for the temperature control
The hydraulic module is equipped with an electric
back-ups system, which is triggered to provide
additional heat during the coldest periods.
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Identification plate
Figure 8 - Hydraulic module components
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Legend
1 - Electric box
2 - Regulator / User interface
3 - Start/stop switch
4 - Heating circulation pump
5 - Initial heating
6 - Gas refrigeration connection
7 - Fluid refrigeration connection
8 - Heating return
9 - Drain valve
10 - Safety valve
11 - Safety thermostat ()
12 - Manometer
13 - Manual drainer
14 - Expansion vessel
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15 - Condenser
16 - Electric back-ups
Side view
Regulation functions
- The heating circuit's initial temperature is controlled
by the temperature control.
- The power of the outside unit is modulated
according to initial heating temperature via the
"inverter" compressor.
- Control of the electric back-up heating.
- The daily timer program enables you to define the
periods for comfortable or reduced ambient
temperature.
- Summer/winter mode switchover is automatic.
- Control of the supplementary boiler* (the electric
back-ups are deactivated).
- The room thermostat* (optional) provides a
corrective action for the temperature control
- Control of a second heating circuit*.
- Domestic hot water: Heating time programme,
control of the operation of the DHW circulation
pump.
- Control of swimming pool heating*.
Protection functions
- Anti-legionella cycle for domestic hot water.
* If the heat pump is equipped with optional
equipment and the associated kits.
Installation and operating manual "1350-EN"