Fujitsu Waterstage WOYG140LCTA Manual page 10

Air to Water Heat Pump split system
4 8 5
4 8 5
Front view
Front view
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 -25°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 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.
- 10 -
1
1
12
12
6
6
14
14
9
9
15
7
7
13
13
10
10
2
2
3 11
3 11
figure 8 - Hydraulic unit components
figure 7, page 9) :
figure 7, page 9) :
figure 8, page 10) :
figure 7, page 9) :
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.
Installation and operating manual "1765 - EN"
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 - Heating circulation pump.
4 - Heating circulation pump.
5 - Heating flow.
5 - Heating flow.
6 - Gas refrigeration connection.
6 - Gas refrigeration connection.
7 - Liquid refrigeration connection.
7 - Liquid refrigeration connection.
8 - Heating return.
8 - Heating return.
9 - Drain valve.
9 - Drain valve.
10 - Safety valve.
10 - Safety valve.
11 - Manometer.
11 - Manometer.
12 - Manual drainer.
12 - Manual drainer.
13 - Expansion vessel.
13 - Expansion vessel.
14 - Back-up resistance.
14 - Condenser.
15 - Condenser.