1 .7 Operating principle
The heat pump transmits the energy in the outdoor air
to the home to be heated.
The heat pump is formed of four main elements inside
which a refrigerating fluid circulates (R410A).
-
In the the evaporator (item.
13
,
The calories are taken from the outdoor air and
transmitted to the refrigerating fluid. As its boiling point
is low, it changes from the liquid state to the vapour
state, even when the weather is cold.
-
--In the compressor (item
10
or
16
,
The vaporised refrigerating fluid is pressurised and
thus carries more calories.
-
In the condensor (item
1
,
): The energy in the
refrigerant is transmitted to the heating circuit. The
refrigerating fluid returns to its liquid state.
-
In the pressure regulator (item
9
or
15
The liquefied refrigerating fluid is taken to low pressure
and returns to its initial temperature and pressure.
The heat pump has a regulator that controls the indoor
temperature based on the measurement of the outdoor
temperature, regulation by water logic. The ambient
sensor (optional) provides a corrective action to the
water logic.
The Hydraulic module is fitted with a burner that has an
AON operation, on demand from the regulator:
- to provide additional heating during the colder
periods,
- to provide support for the domestic (DHW) or
- to take over on
"Peak Tariff"
days (load shedding
function or EJP, see
).
Priority is given to the operation of the heat pump.
When the heat pump is not sufficient for the heating, the
burner automatically takes over.
•
Regulation functions
-
The initial temperature of the heating circuit is
controlled by water logic.
-
In function of an initial heating temperature, the power
of the outdoor unit is modulated via the "inverter"
compressor.
-
Management of the supplementary heating.
-
The daily timer programme allows comfort or reduced
ambient temperature periods.
-
Switching between summer/winter operation is
automatic
-
Domestic hot water: Timer heating programme,
management of operation of the DHW circulation
pump
-
Ambient sensor*: The ambient sensor provides a
corrective action to the water logic.
-
Management of a 2nd heating circuit*.
-
Management of the heating of the swimming pool*.
*
When the PAC (heat pump) is fitted with associated options and kits
•
Protection functions
-
Anti-legionella cycle for the domestic hot water.
-
A pressure switch monitors the hydraulic pressure.
If the pressure is below 0.5 bar, an error message is
displayed (369) and the heat pump is stopped.
figure 10 - Operating principle of a heat pump
Ev
Dt
Cn
Cp
1 kW
COP 4
4 kW
20 °C
PAC
PAC
- heat pump
Ev
- Evaporator
Cp
- compressor
Cn
- condenser
Dt
- pressure regulator
Air energy
Heat produced
Electrical
energy
consumed
Installation and operating manual
"
1605 - EN
"
- 11 -
alfea hybrid duo heat pump oil low NOx CH
