• Domestic hot water (DHW) operating principle
Two domestic hot water (DHW) temperatures can be
parametered: nominal temperature (line 1610 to 55°C)
and reduced temperature (line 1612 to 40°C).
The default heat pump program (line 560, 561 and 562)
is set for nominal temperature from 0:00 to 5:00 and
from 14:30 to 17:00 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 (setting from
line 5024) 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 (1620) is set, nominal
temperature can be reached 24h/day or only at night or
depending on the heat pump program.
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 "nominal"
is provided on the front of the user interface.
(see ref. 5, gure 42, page 46).
Anti-legionella cycles can be programmed.
• Fan convectors with integrated control system
Do not use a room sensor in the area.
gure 11 - Heat pump operating principle
Ev
Dt
Cn
Cp
1kW
COP 4
4kW
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 "1734 - EN"
Heat pump air/water split 1 service alféa extensa +
- 12 -
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