Purpose Of The Heat Pump; Application; Operating Principle; Functional Description For Integrated Thermal Energy Metering - Dimplex Li 9Tu Montage- Und Gebrauchsanweisungen

LI 9TU - LI 12TU
2

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 newly built or previ-
ously existing heating systems.
The heat pump is suitable for mono energy and bivalent opera-
tion down to an external temperature of -20 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return flow 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. The addi-
tional heat consumption should be met using special devices
provided by the customer. If a building is to be dried out in au-
tumn or winter, we recommend installing an additional heating
element (available as an accessory).
NOTE
The device is not suitable for operation with a frequency
converter.
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2.2 Operating Principle

Outside air is drawn in by the ventilator and fed via the evapora-
tor (heat exchanger). The evaporator cools the air, i.e. it extracts
heat from it. This extracted heat is then transferred to the work-
ing medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by in-
creasing its pressure with the aid of an electrically driven com-
pressor. It is then transferred to the heating water using the liq-
uifier (heat exchanger).
Electrical energy is used to raise the temperature of the heat in
the environment to a higher level. Because the energy ex-
tracted 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 com-
pressor, 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. Steam may be emitted from the air outlet de-
pending on the atmospheric conditions.
2.3 Functional description for
integrated thermal energy
metering
The compressor manufacturer's performance specifications for
different pressure levels are stored in the heat pump software.
Two additional pressure sensors for determining the current
pressure level are installed in the refrigerating circuit, one be-
fore and one after the compressor. The current heat output can
be calculated from the compressor data stored in the software
and the current pressure level. The integral for the heat output
over the runtime gives the quantity of thermal energy supplied
by the heat pump, which is displayed separately for heating,
domestic hot water preparation and swimming pool water
preparation on the heat pump manager´s display.
452160.66.74a · FD 0112
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