Operating Principle - Fujitsu 112 Installation And Operating Manual

Heat pump split single service 3 phase
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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 (R410A) circulates.
- In the evaporator (rep. 13,
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 (rep. 10,
vaporised refrigerant brought to high pressure and
takes on more calories.
- In the condenser (rep. 15,
energy in the refrigerant is transmitted to the heating
circuit. The refrigerant returns to liquid state.
- In the expansion valve (rep. 9,
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 equipped with an electric back-ups
system, which is triggered to provide additional heat
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 initial heating temperature via the "inverter"
compressor.
- Possibility to set the setpoint of maximun heating initial
temperature.
- Control of the electric 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* (the electric back-
ups are deactivated).
- The room thermostat* (option) provides a corrective
action for the temperature control
- Control of a second heating circuit*.
- Domestic hot water : Heating time programme, control
of the operation of the DHW circulation pump*.
- Control of swimming pool heating*.
- Managing the cooling*.
Protection functions
- Anti-legionella cycle for domestic hot water.
* If the heat pump is equipped with optional equipment
and the associated kits.
Installation and operating manual "1364 - EN"
figure 7, page 10) : The
fig 7 , page 10) : The
figure 8, page 10 ) : The
figure 7, page 10) : The
Domestic hot water (DHW) operating principle
Two domestic hot water (DHW) temperatures can be
parametered: comfort temperature (line 1610 to 60 °C)
and reduced temperature (line 1612 to 40 °C).
The default heat pump program (line 560, 561 and 562)
is set for comfort temperature from 0.00 to 5.00h and for
reduced temperature for the rest of the day.
This optimises electrical consumption while ensuring
comfortable availability of hot water.
Setting for reduced temperature can be useful to prevent
the DHW from switching on too often and for too long
during the day.
The production of domestic hot water (DHW) is triggered
when the temperature in the tank falls 7°C (setting from
line 5024) below the set temperature.
The heat pump produces the domestic hot water, which
is then supplemented, if required, by electrical backup
heating from the tank.
To ensure a DHW setting over 45°C, the electrical
backup heating or the boiler must be left on.
Depending on how the parameter (1620) is set, comfort
temperature can be reached 24h/day or only at night or
depending on the heat pump programme.
If the contract concluded with the energy provider
includes a subscription to day/night tariff, the electrical
backup is subordinate to the supplier's power tariff and
the comfort temperature may only be reached at night.
If no particular contract is concluded, the comfort
temperature can be reached at any time, including
during the day
The production of DHW takes priority over heating;
nevertheless the production of DHW is controlled by
cycles that control the times assigned to the heating
and the production of DHW in the event of simultaneous
demand.
A function to switch from "reduced" to "comfort" is
provided on the front of the user interface (see ref. 1,
figure 39, page 29 ).
If the heating installation is equipped with a DHW
circulation pump, the pump's operation during DHW
cycles can be parametered.
Anti-legionella cycles can be programmed.
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