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2
Intended use of the heat
pump
2.1 Area of 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 in outside air temperatures to -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. 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).
In cooling operation, the heat pump is suitable for air tempera-
tures ranging from +15 °C to + 45 °C. It can be used for silent
and dynamic cooling. The minimum cooling water inlet temper-
ature see "Device information" on page 16.
NOTE
The device is not suitable for operation with a frequency
converter.
EN-4
2.2 Operating principle
Heat
Outside air is drawn in by the ventilator and fed via the evapora-
tor (heat exchanger). The evaporator cools the air, i.e. 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 increas-
ing its pressure with the aid of the electrically driven compres-
sors. It is then transferred to the heating water via the liquefier
(heat exchanger).
Electrical energy is used to raise the temperature level of the
heat from the environment. Since 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 evapo-
rator, fan, expansion valve, 4-way reversing valve, as well as the
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.
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
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 display.
The integrated thermal energy metering must not be used for
heating cost billing purposes. EN 1434 is not applicable.
452170.66.01-EN · FD 0303
integrated thermal energy
metering.
LI 1422C - 1826C
www.dimplex.de
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