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.
13
,
) :
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.
10
,
) :
The vaporised refrigerant brought to high pressure
and takes on more calories.
-In the condenser (ref.
14
,
) :
The energy in the refrigerant is transmitted to the
heating circuit. The refrigerant returns to liquid state.
-In the expansion valve (ref.
9
,
) :
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 - Heating circulation pump.
5 - Heating flow.
6 - Gas refrigeration connection.
7 - Liquid refrigeration connection.
8 - Heating 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 "1533 - EN"
Air to Water Heat Pump
- 10 -
