Purpose Of The Heat Pump; Application; Operating Principle; Functional Description For Integrated Thermal Energy Metering - Dimplex LI 16I-TUR Instructions D'installation Et D'utilisation

LI 16I-TUR
2

Purpose of the heat pump

2.1 Application

The air-to-water heat pump is to be used exclusively for the
heating and cooling of heating water. It can be used in new or
existing heating systems.
The heat pump is suitable for mono-energy and bivalent opera-
tion down to an external temperature of -22 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return temperature of more than 22 °C
(+2 °C/-0 °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. For drying out build-
ings in autumn or winter, we recommend installing a suitable
2nd heat generator (e.g. electric heating element available as an
accessory).
In cooling operation, the heat pump is suitable for air tempera-
tures ranging from +15 °C to + 40 °C. It can be used for silent
and dynamic cooling. The minimum cooling water inlet temper-
ature is +7 °C.
NOTE
The device is not suitable for operation with a frequency
converter.
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2.2 Operating principle

Heating
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.
Cooling
The functions of the evaporator and the liquefier are reversed in
the "Cooling" operating mode.
The heating water transfers its heat to the refrigerant via the liq-
uefier, which is now functioning as an evaporator. The refriger-
ant is brought to a higher temperature level using the compres-
sor. Heat is transferred to the surrounding air via the liquefier
(which, in heating operation, functions as an evaporator).
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.
The integrated thermal energy metering must not be used for
heating cost billing purposes. EN 1434 is not applicable.
452169.66.06 · FD 0009
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