Purpose Of The Heat Pump; Application; Operating Principle; Scope Of Supply - Dimplex La 9Tu Montage- Und Gebrauchsanweisung

2 Purpose of the heat
pump

2.1 Application

The air-to-water heat pump is to be used exclusively for the heat-
ing of heating water. It can be used in new or already-existing
heating systems.
The heat pump is suitable for mono-energy and bivalent opera-
tion down to an external temperature of -25 °C.
Proper defrosting of the evaporator is guaranteed by maintaining
a heating water return temperature of more than 18 °C during
continuous operation.
The heat pump is not designed for the increased heat consump-
tion required when a building is being dried out. For this reason,
the additional heat consumption should be met using special de-
vices provided by the customer. If a building is to be dried out in
autumn or winter, we recommend installing an additional electric
heating element (available as an accessory).
ATTENTION!
The device is not suitable for operation with a frequency converter.

2.2 Operating principle

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 an electrically driven compressor. It is
then transferred to the heating water via the liquefier (heat ex-
changer).
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 compressor, the liquefier and the electrical control system.
At low ambient temperatures, humidity accumulates on the evap-
orator in the form of frost, reducing the transfer of heat. The
evaporator is defrosted automatically by the heat pump as re-
quired. Steam may be emitted from the air outlet depending on
the atmospheric conditions.
3

Scope of supply

3.1 Basic device

The heat pump is of compact design and is supplied complete
with the components listed below.
The refrigerating circuit is "hermetically sealed". It contains the
Kyoto protocol approved refrigerant R404A with a GWP value of
3260. It is CFC-free, does not deplete ozone and is non-flamma-
ble.
www.dimplex.de
1) Evaporator
2) Ventilator
3) Liquefier
4) Pressure controllers
5)

Switch box

6) Filter dryer
7) Compressors
8) Expansion valve
3.2 Switch box
The switch box is located in the heat pump. It can be swung out
after removing the front cover and loosening the fastening screw
located in the upper left-hand corner.
The switch box contains the supply connection terminals as well
the power contactors and the soft starter unit.
The plug connectors for the control line are located on the switch
box panel near the pivotal point.

3.3 Heat pump manager

Use the heat pump manager included in the scope of supply to
operate the air-to-water heat pump.
The heat pump manager is a convenient electronic regulation
and control device. It controls and monitors the entire heating
system based on the external temperature, as well as domestic
hot water preparation and safety systems.
The customer must install the external temperature sensor which
is included in the scope of supply of the unit heat pump and man-
ager together with the necessary fixing accessories.
The enclosed operating instructions describe the function and
use of the heat pump manager.
3.3
EN-3