Energy-Efficient Use Of The Heat Pump; Operating Principle; Scope Of Supply; Basic Device - Dimplex LIA 7IM Instructions D'installation Et D'utilisation

1.4
1.4 Energy-efficient use of the heat
pump
With the purchase of this heat pump, you are helping to protect
the environment. A prerequisite for energy-efficient operation is
the correct design of the heat source system and heating system.
To maintain heat pump efficiency, it is particularly important to
keep the temperature difference between the heating water and
heat source to a minimum. For this reason, it is advisable to
design the heat source and heating system very carefully. A
temperature difference of one Kelvin (1 °C) increases the
power consumption by around 2.5%. When designing the
heating system, it should be borne in mind that special
consumers such as domestic hot water preparation should also
be taken into consideration and dimensioned for low
temperatures. Underfloor heating systems (panel heating)
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
contaminated during operation,
temperature difference, which in turn reduces the COP.
When set correctly, the heat pump controller is also an essential
factor in the energy-efficient use of the heat pump.
2 Purpose of the split heat
pump
ATTENTION!
Dimplex split heat pumps feature a single-phase electrical connection
(230 V). They do not automatically meet the applicable technical
connection conditions. Written consent should therefore be obtained
from the utility company prior to connection. A utility block can be
implemented via a contactor provided by the customer which
disconnects all power to the heat pump.
2.1 Application
The split air-to-water heat pump is to be used exclusively for the
heating of heating water. It can be used in new or existing
heating systems.
The heat pump is suitable for mono energy operation at
external air temperatures as low as - 20°C.
Proper defrosting of the evaporator is guaranteed by maintaining
a heating water return temperature of more than 25 °C during
continuous operation.
The heat pump is not designed for the increased heat
consumption 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.
EN-4
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as this increases the

2.2 Operating principle

Surrounding air is drawn in by the fan and fed through the
evaporator (heat exchanger). The evaporator cools the air, i.e.
extracts heat from it. This extracted heat is then transferred to the
working medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increasing
its pressure with the aid of an 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
from the environment to a higher level. Because the energy
extracted from the air is transferred to the heating water, this type
of device is referred to as an air-to-water heat pump.
Main components of the air-to-water heat pump are the
evaporator, fan and expansion valve, as well as the low-noise
compressor, the liquefier and the electrical control system.
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. Under certain atmospheric conditions, steam may
be emitted from the air outlet.
3

Scope of supply

3.1 Basic device

3.1.1 Indoor unit
Fig. 3.1:LIA 7IM / LIA 9IM basic device