Notes on the documentation 2
0020147164_07 aroTHERM Installation instructions
7
2
Notes on the documentation
2.1
Observing other applicable documents
▶
You must observe all the operating and installation in-
structions included with the system components.
2.2
Storing documents
▶
Pass these instructions and all other applicable docu-
ments on to the system operator.
2.3
Applicability of the instructions
These instructions apply to units with the following type des-
ignations and article numbers only:
Type designation
Art. no.
aroTHERM VWL 55/2 A 230 V
0010014566
aroTHERM VWL 85/2 A 230 V
0010011971
aroTHERM VWL 115/2 A 230 V
0010011972
aroTHERM VWL 155/2 A 230 V
0010014567
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 outside temperat-
ures:
VWL 55/2 A 230 V
VWL 85/2 A 230 V
VWL 115/2 A 230 V
VWL 155/2 A 230 V
Heating mode
−
15 … 28
℃
−
20 … 28
℃
Cylinder charging
mode
−
15 … 46
℃
−
20 … 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 in order to prevent possible dam-
age caused by switching it 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 ac-
tivated as the heating pump is started. In addition, frost
protection agent should be added to the heating water as
the heating water temperature may fall below the freez-
ing point in the event of a power cut, which poses a risk
of frost to the heating installation.
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 module
–
Additional hydraulic components, if required
–
VRC 470 system controller
The heat pump can be operated by the VWZ AI heat pump
control 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 coolant circuit releases heat into the heating circuit
by means of evaporation, compression, condensation
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
3.3.2
Thawing
1
2
3
4
5
6
1
Evaporator
2
4-way valve
