Installation Instructions

6 Start-up
24 Installation instructions aroTHERM 0020147164_04
– Operating pressure: 0.15 … 0.2 MPa (1.50
… 2.0 bar)
▶ Open the service valves on the back of the product.
▶ Remove the hose and the mixing container.
6.12.1.1 Available pressure in the heat pump
heating circuit
A
B
0
10
20
30
40
50
60
70
80
5000 1000 1500 2000
C
100
200
300
400
500
600
700
800
90 900
2500
3
2
1
4
1 VWL 55/2 A 230 V (water
temperature 20 °C)
2 VWL 85/2 A 230 V (water
temperature 20 °C)
3 VWL 115/2 A 230 V (water
temperature 20 °C)
4 VWL 155/2 A 230 V (water
temperature 20 °C)
A Remaining feed head
(kPa)
B Flow rate (l/h)
C Remaining feed head
[mbar]
6.12.2 Adjusting the heating circuit flow rate
Caution.
Risk of material damage due to frost
If the minimum flow rate is too low, the heat
exchanger may become damaged by frost.
▶ Operate the product with a sufficient flow
rate (see table).
The product is designed for operation between the minimum
flow rate and maximum flow rate, as specified in the table. If
the product is operated with the minimum flow rate, this res-
ults in a loss of energy and efficiency. The heating comfort is
still guaranteed but the energy savings are reduced.
VWL 55/2 VWL 85/2 VWL 115/2 VWL 155/2
Minimum
flow rate
380 l/h 380 l/h 540 l/h 1,200 l/h
Maximum
flow rate
860 l/h 1,400 l/h 1,900 l/h 2,590 l/h
You can read the flow rate directly from the controller. De-
pending on the type of liquid in the heating circuit, the flow
rate displayed on the controller may be exaggerated.
Example: If you use a 30% mixture of propylene glycol and
the liquid temperature is 5 °C, you must subtract 400 l/h from
the value shown on the display.
▶ Use the following table to compare the various exaggera-
tion flow rate values depending on liquid type.
– Applies for: VWL 55/2 A 230 V,
VWL 85/2 A 230 V,
VWL 115/2 A 230 V
Flow rate increase (l/h) Temper-
ature
5 °C
Temper-
ature
15 °C
Temper-
ature
25 °C
Liquid
type
Water 0 0 0
60% alcohol 0 0 0
30% propylene
glycol
400 240 120
50% propylene
glycol
650 500 400
30% ethylene
glycol
120 0 0
50% ethylene
glycol
400 140 50
– Applies for: VWL 155/2 A 230 V
Flow rate increase (l/h) Temper-
ature
5 °C
Temper-
ature
15 °C
Temper-
ature
25 °C
Liquid
type
Water 0 0 0
60% alcohol 0 0 0
30% propylene
glycol
600 440 280
50% propylene
glycol
1050 740 580
30% ethylene
glycol
520 350 300
50% ethylene
glycol
880 680 540
Note
Insufficient purging may lead to deviations in the
flow rate.
▶ If you cannot reach the minimum flow rate, install an ad-
ditional pump.
▶ If you cannot reach the recommended flow rate, adjust
the heating circuit pressure on the controller and, if ne-
cessary, use a bypass valve (item 50).
6.12.3 Adapting the unit to the heating installation
The installation assistant is launched when the product is
switched on for the first time.
If you have already filled the heating installation and termin-
ated the installation assistant, but want to set the most im-
portant system parameters again, you can also call up the
Configuration menu point.
Menu → Installer level Configuration