Atlantic alfea extensa + - Operating Principle

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 uid (R410A) circulates.
- In the evaporator (ref. 12, gure 9, page 10) :
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 -20°C
outdoor temperature).
- In the compressor (ref. 9, gure 9, page 10) :
The vaporised refrigerant brought to high pressure
and takes on more calories.
- In the condenser (ref. 14, gure 10, page 11) : The
energy in the refrigerant is transmitted to the heating
circuit. The refrigerant returns to liquid state.
- In the expansion valve (ref. 8, gure 9, page 10) :
The liqueed 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 can be optionally tted with an
electrical back-up system or boiler connection which
starts up in order to provide addtional heating during the
coldest periods.
• Regulation functions
- The heating circuit's initial temperature is controlled by
the temperature control.
- The power of the outdoor unit is modulated according
to ow heating temperature via the "Inverter"
compressor.
- Control of the electrical back-up heating (option).
- The daily timer program enables you to dene
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)
.
gure 10 - Hydraulic unit components
Legend :
1 - Electric box.
2 - Regulator / User interface.
3 - Start/stop switch.
4 - Heating circulation pump.
5 - Heating ow.
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 - Condenser.
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Front view
Side view
Installation and operation manual "1734 - EN" - 11 -
Heat pump air/water split 1 service alféa extensa +
.
The heat pump must be equipped with an electrical
back-up system or boiler connection, which is designed
to provide additional heat during the coldest periods.