Installation, use and maintenance manual
DOCUMENT 6328408
43
1.3
Copyright
These instructions contain information
protected by copyright. Do not photocopy,
duplicate, translate or store these usage
instructions on storage media either in whole
or in part, without prior authorisation from
the supplier. Any violations shall be subject
to compensation for damages. All rights,
including those resulting from the issuance
of patents or registration of utility models,
are reserved.
1.4
Operating principle
The appliances in this range produce
domestic hot water using mainly heat-pump
technology. A heat pump transfers thermal
energy from a source at a lower
temperature to a source at a higher
temperature, and vice versa (using heat
exchangers).
The appliance uses a hydraulic circuit
composed of a compressor, an evaporator,
a capacitor and a thermal expansion valve.
A refrigerant fluid/gas flows in the circuit
(see section 4.5).
The compressor creates a difference in
pressure inside the circuit, which creates a
thermodynamic cycle. The compressor
aspirates the refrigerant fluid through an
evaporator, where it evaporates at low
pressure absorbing heat, compresses it and
forces it towards the capacitor, where the
fluid condenses at high pressure, releasing
the absorbed heat. The fluid then passes
through a thermal expansion valve and,
decreasing in pressure and temperature,
starts to vaporise and enters the evaporator
again, restarting the cycle.
Fig. 5 – Operating principle
The appliance operating principle is as
follows (Fig. 1):
I-II:
the refrigerant fluid aspirated by the
compressor runs inside the evaporator and,
while evaporating, absorbs the ecological
heat provided by the air.
At the same time, the air in the space is
aspirated by the appliance, thanks to the
fan. As it passes on the finned battery of the
evaporator, the air releases its heat;
II-III:
the refrigerant gas passes inside the
compressor and there is an increase in
pressure which raises the temperature,
turning the gas into overheated vapour;
III-IV:
in the capacitor, the refrigerant gas
releases its heat in the water in the tank
(boiler). This exchange process transforms
the refrigerant from an overheated vapour
into a liquid state, condensing at a constant
pressure and dropping in temperature;
IV-I:
the refrigerant liquid passes through the
thermal expansion valve, quickly dropping
both in pressure and temperature. It partially
vaporises, returning to the initial pressure
and
temperature
conditions.
The
thermodynamic cycle can now start again.
Ecological heat
Capacitor
Air
Evaporator
Fan
Compressor
Thermal expansion
valve
Tank
Cold water
Hot water
Electrical heat
