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English
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 circulating pump(s) must be controlled using the heat
pump manager.
If function-relevant or safety-relevant pump functions, such as
integration of the heat pump into the building management
system, are not supported, then this can result in loss of war-
ranty and cause a write-off of the heat pump.
The circulating pump(s) and the heat pump controller must al-
ways be ready for operation.
The specifications in the technical documents must be fol-
lowed, particularly limit values for the minimum and – if availa-
ble – maximum warm/cold water volume flow.
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 units 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 is +7 °C.
NOTE
The unit is not suitable for operation with a frequency
converter.
EN-4
2.2 Operating principle
Heating
Outside air is drawn in by the fan and fed via 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 increas-
ing its pressure with the aid of an electrically driven compres-
sor. 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 unit is re-
ferred 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 refrigeration circuit of the heat
pump, one before 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 sepa-
rately for heating, domestic hot water preparation and swim-
ming pool water preparation on the heat pump manager dis-
play.
The integrated thermal energy metering must not be used for
heating cost billing purposes. EN 1434 is not applicable.
452170.66.02-EN · FD 0305
integrated thermal energy
metering
LA 1422C
www.dimplex.de
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