6 Start-up
24
Installation instructions aroTHERM 0020147164_07
6.11
Operating noises
"Hhmmm..." (*)
"Ttsheeh...!"
"Eeee..."
“Clink!"
"Chug, chug,
chug,..."
"Whirr..." (*)
1
2
3
4
5
6
*
Permanent operating
noises
The noises listed do not constitute a fault with the heat
pump.
In various operating modes, the noises come from the heat
pump (Start, Thawing, Stop).
6.12
Adjusting the heating circuit
6.12.1 Purging the heating circuit
Conditions
: SW10 open-end spanner
▶
Connect one end of the hose to the purging valve.
▶
In order to collect the residual glycol when purging the
heating circuit, insert the other end of the hose into the
mixing container.
▶
Close the stop valves on the back of the product.
▶
Increase the pressure in the heating circuit.
▶
Open the purging valve with an open-end spanner.
▶
Open the lower stop valve on the back of the product.
▶
If liquid escapes from the pipe, close the purging valve.
▶
Repeat the work steps for all hydraulic circuits by chan-
ging the direction of the 3-way valve.
▶
Check the pressure in the heating circuit. If necessary,
increase it.
–
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.
Note
The system controller has a purging func-
tion. The purging function can be started via
the heat pump's control module. Within 15
minutes, the pumps are switched on for a
period of 30 seconds and switched off again
(30 seconds).
6.12.1.1 Available pressure in the heat pump
heating circuit
A
B
0
10
20
30
40
50
60
70
80
500
0
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
