Operating Principle - Fujitsu Waterstage WOYA060LFCA Installation And Operating Manual

Air to Water Heat Pump, split system
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Front view Front view
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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 -20 °C
outdoor temperature).
- In the compressor (ref. 9,
The vaporised refrigerant brought to high pressure
and takes on more calories.
- In the condenser (ref. 14,
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 can be optionally fitted with an
electrical back-up system or boiler connection which
starts up in order to provide addtional heating during the
coldest periods.
Installation and operation manual "1764 - EN"
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figure 8 - Hydraulic unit components
figure 7, page 10) :
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figure 8, page 11) : The
figure 7, page 10) :
Side view Side view
• 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 (option).
- 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)
Legend :
Legend :
1 - Electric box.
1 - Electric box.
2 - Regulator / User interface.
2 - Regulator / User interface.
3 - Start/stop switch.
3 - Start/stop switch.
4 - Water circulation pump.
4 - Heating circulation pump.
5 - Water flow.
5 - Heating flow.
6 - Gas refrigeration connection.
6 - Gas refrigeration connection.
7 - Liquid refrigeration connection.
7 - Liquid refrigeration connection.
8 - Heating return.
8 - Water return.
9 - Drain valve.
9 - Drain valve.
10 - Safety valve.
10 - Safety valve.
11 - Manometer.
12 - Manual drainer.
11 - Manometer.
13 - Expansion vessel.
12 - Manual drainer.
14 - Condenser.
13 - Expansion vessel.
14 - Back-up resistance.
15 - Condenser.
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