2 Notes on the documentation
6
Installation instructions aroTHERM 0020217827_03
2
Notes on the documentation
2.1
Observing other applicable documents
▶
Always observe all the operating and installation instruc-
tions included with the system components.
2.2
Storing documents
▶
Pass these instructions and all other applicable docu-
ments on to the end user.
2.3
Validity of the instructions
These instructions apply to units with the following type des-
ignations and article numbers only:
Type designation
Art. no.
aroTHERM VWL 55/3 A 230 V
0010019758
aroTHERM VWL 85/3 A 230 V
0010019759
The seventh to sixteenth digits of the serial number on the
identification plate form the article number.
3
System overview
3.1
Safety devices
–
The product can work at the following outdoor temperat-
ures:
VWL 55/3 A 230 V
VWL 85/3 A 230 V
Heating mode
−
15 to 28
℃
−
20 to 28
℃
Cylinder charging
mode
−
15 to 46
℃
−
20 to 46
℃
–
If the product's refrigerant circuit pressure exceeds the
maximum pressure of 4.15 MPa (41.5 bar), the high-
pressure pressure switch switches the product off. Fol-
lowing a waiting period, the product attempts to start
once more. After three failed start attempts in succes-
sion, a fault message is displayed.
–
If the product is switched off, the crankcase housing
heating is switched on when the compressor outlet tem-
perature reaches 7 °C. This prevents possible damage
caused by switching the product back on.
–
If the compressor inlet temperature and the compressor
outlet temperature are below 1 °C, the compressor does
not start up.
–
A temperature sensor on the compressor outlet limits the
product's operation if the measured temperature exceeds
the maximum permissible temperature. The maximum
permissible temperature depends on the evaporation and
condensation temperature.
–
The product measures the flow rate of the connected
heating circuit when starting up the product.
–
If the heating circuit temperature falls below 3 °C, the
product's frost protection function is automatically activ-
ated as the heating pump is started.
Caution.
Risk of material or environmental damage.
In the event of a power cut, for example due
to maintenance work, interruptions in the
power supply or power failure at the energy
supply company, the heating water temper-
ature may fall below the freezing point. The
product's internal frost protection functions
then switch off and there is a risk of frost for
the heating installation.
▶
Ensure that the heating installation can
operate without being affected by frost.
Note
Operating the heat pump outside the application
limits results in the heat pump being switched off
by the internal control and safety devices.
3.2
Design of the heat pump system
The heat pump system consists of the following components:
–
aroTHERM
heat pump
–
VWZ AI heat pump control interface module
–
Additional hydraulic components, if required
–
VRC 700 system control
The heat pump can be operated by the VWZ AI heat pump
control interface module. The extended operation of the heat
pump is carried out by the system controller.
3.3
Functionality
The product comprises the following circuits:
–
The refrigerant circuit releases heat into the heating cir-
cuit by means of evaporation, compression, condensa-
tion and expansion
–
The heating circuit
3.3.1
Heating mode
1
2
3
4
5
6
1
Evaporator
2
4-way valve
3
Fan
4
Compressor
5
Electronic expansion
valve
6
Plate heat exchanger
Summary of Contents for aroTHERM VWL 55/3 A 230 V
Page 39: ......
