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 fluid (R410A) circulates.
- In the evaporator (ref.
12
,
) :
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 (ref.
9
,
) :
The vaporised refrigerant brought to high pressure
and takes on more calories.
- In the condenser (ref.
15
,
) :
The energy in the refrigerant is transmitted to the
heating circuit. The refrigerant returns to liquid state.
- In the expansion valve (ref.
8
,
) :
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 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 hydraulic unit is fitted with an electrical back-up
system or, optionally, boiler connection which starts up
in order to provide addtional heating during the coldest
periods.
Legend :
1 -
Electric box.
2 -
Regulator / User interface.
3 -
Start/stop switch.
4 -
Water circulation pump.
5 -
Water flow.
6 -
Gas refrigeration connection.
7 -
Liquid refrigeration connection.
8 -
Water return.
9 -
Drain valve.
10 -
Safety valve.
11 -
Manometer.
12 -
Manual drainer.
13 -
Expansion vessel.
14 -
Back-up resistance.
15 -
Condenser.
•
Regulation functions
- The heating circuit's initial temperature is controlled by
the temperature control.
- The power of the outdoor unit is modulated according
to flow heating temperature via the "inverter"
compressor.
- Control of the electrical 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* (options).
- The room thermostat (option)*: provides a corrective
action for the temperature control.
- Control of a second heating circuit*.
- Domestic hot water*: Heating time program, control of
the operation of the DHW circulation pump.
- Managing the cooling*.
- Control of swimming pool heating*.
*
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
(provided that the heat pump's electrical power supply
is not interrupted).
figure 7 - Hydraulic unit components
2
1
4
3 11
7
6
5
8
9
10
13
14
15
12
Front view
Side view
Installation and operating manual "1532 - EN"
Air to Water Heat Pump
- 10 -
