• Domestic hot water (DHW) operating principle
Two domestic hot water (DHW) temperatures can be
parametered: nominal temperature (see user interface
reference 2, gure 34, page 30) and reduced temperature
(line 65 to 40 °C).
The default heat pump program is set for nominal
temperature from 0.00 to 5.00h and for reduced
temperature for the rest of the day, this optimizes
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 below the set
temperature.
The heat pump produces the domestic hot water,
which is then additively heated, if required, by electrical
back-up heating inside the tank.
To ensure a DHW setting over 45°C, the electrical
back-up heating or the boiler must be left on.
Depending on how the parameter 83 is set, nominal
temperature can be reached 24h/day or only at night or
depending on the heat pump programme.
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 "nominal"
is provided on the front of the user interface
(see reference 5, gure 34, page 30).
Anti-legionella cycles can be programmed.
• Fan convectors with integrated control system
Do not use a room sensor in the area.
gure 9 - Heat pump operating principle
Ev
Dt
Cn
Cp
1 kW
COP 4
4 kW
20 °C
PAC
HP - Heat pump
Ev - Evaporator
Cp - Compressor
Cn - Condenser
Dt - Expansion valve
Energy
from the air
Heat produced
Electrical
energy
consumed
HP
Installation and operation manual "1397 - EN" - 11 -
Heat pump split single service alféa Evolution
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