Energy-Efficient Use Of The Heat Pump; Purpose Of The Heat Pump; Application; Operating Principle - Dimplex LA 25TU-2 Instructions D'installation Et D'utilisation

LA 25TU-2 - LA 40TU-2
1.4 Energy-efficient use of the heat
pump
By operating this heat pump, you are helping to protect the en-
vironment. A prerequisite for energy-efficient operation is the
correct design of the heat source system and heating system.
It is particularly important for the efficiency of a heat pump to
keep the temperature difference between heating water and
heat source as small as possible. For this reason, it is advisable
to design the heat source and heating system very carefully. A
temperature difference of approx. one Kelvin (one °C) in-
creases the power consumption by around 2.5 %. When de-
signing the heating system, it should be borne in mind that spe-
cial consumers such as e.g. domestic hot water preparation
should also be taken into consideration and dimensioned for
low temperatures. Underfloor heating systems (panel heat-
ing) are optimally suited for heat pump use on account of the
low flow temperatures (30 °C to 40 °C).
It is important to ensure that the heat exchangers are not con-
taminated during operation because this increases the temper-
ature difference, in turn reducing the COP.
Correct adjustment of the heat pump manager is also impor-
tant for energy-efficient use of the heat pump. Further informa-
tion can be found in the operating instructions of the heat
pump manager.
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Purpose of the heat pump

2.1 Application

The air-to-water heat pump is to be used exclusively for the
heating of heating water. It can be used in new or already-exist-
ing heating systems.
The heat pump is suitable for mono-energy and bivalent opera-
tion down to an external temperature of -25 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return temperature of more than 18 °C
during continuous operation.
The heat pump is not designed for the increased heat con-
sumption required when a building is being dried out. For this
reason, the additional heat consumption should be met using
special devices provided by the customer. If a building is to be
dried out in autumn or winter, we recommend installing an ad-
ditional electric heating element (available as an accessory).
NOTE
The device is not suitable for operation with a frequency
converter.

2.2 Operating principle

Surrounding air is drawn in by the fan and fed through the evap-
orator (heat exchanger). The evaporator cools the air, i.e. it ex-
tracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is brought to a higher temperature level by increasing
its pressure with the aid of the electrically driven compressor. It
is then transferred to the heating water via the liquefier (heat
exchanger).
Electrical energy is used to raise the temperature of the heat in
the environment to a higher level. As the energy extracted from
the air is transferred to the heating water, this type of device is
called an air-to-water heat pump.
The air-to-water heat pump consists of the main components:
evaporator, ventilator and expansion valve, as well as the low-
noise compressors, the liquefier and the electrical control sys-
tem.
At low ambient temperatures, humidity accumulates on the
evaporator in the form of frost, reducing the transfer of heat.
Uneven accumulation during this process does not indicate a
fault. The evaporator is defrosted automatically by the heat
pump as required. Steam may be emitted from the air outlet de-
pending on the atmospheric conditions.
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