System overview 3
0020147164_09 aroTHERM Installation instructions
7
3.3.2
Thawing
1
2
3
4
5
6
1
Evaporator
2
4-port valve
3
Fan
4
Compressor
5
Electronic expansion
valve
6
Plate heat exchanger
3.3.3
Application limits
Operation of the pump outside the application limits results in
the heat pump being switched off by the internal control and
safety devices.
3.3.3.1 Operating limit in heating mode
(VWL 55/2 A 230 V)
60
50
70
40
30
20
10
0
-20
-10
0
10
20
30
40
50
[-15;22]
[-15;45]
[46;22]
[46;58]
[35;60]
[28;60]
[2;60]
[-10;55]
1
2
[28;22] [35;22]
A
B
1
Heating mode applica-
tion limits
2
Domestic hot water
generation application
limits
A
Water temperature
B
Air temperature
3.3.3.2 Operating limit in heating mode
(VWL 85/2 A 230 V, VWL 115/2 A 230 V,
VWL 155/2 A 230 V)
60
50
70
40
30
20
10
0
-20
-10
0
10
20
30
40
50
[-20;22]
[-20;43]
[46;22]
[46;58]
[35;63]
[28;63]
[2;63]
[-10;55]
1
2
[28;22] [35;22]
A
B
1
Heating mode applica-
tion limits
2
Hot water generation
application limits
A
Water temperature
B
Air temperature
3.4
Basic system diagram (VWL 55/2 A 230 V)
e
1
3
12
16
17
19
24
15
21
14
11
4
23 20
2
22
5 13
8
9
6
7
10
A
B
18
1
Fan
2
Air inlet temperature
sensor
3
Finned-tube heat ex-
changer
4
Temperature sensor
for the finned-tube heat
exchanger
5
4-port valve
6
Return heating circuit
temperature sensor
7
High-efficiency pump
with flow rate sensor
8
Purging valve
9
Flow heating circuit
temperature sensor
10
Drain valve
11
Plate heat exchanger
12
Temperature sensor
after the plate heat
exchanger
13
Service valve for the
high-pressure range of
the refrigerant circuit
14
High-pressure pressure
switch in the refrigerant
circuit
15
High-pressure sensor in
the refrigerant circuit
16
Compressor outlet
temperature sensor
17
Rotary compressor
18
Filter
19
Liquid separator
20
Electronic expansion
valve
21
Compressor inlet tem-
perature sensor
22
Service valve for the
low-pressure area of the
refrigerant circuit
23
Filter
24
Fluid collector
A
Heating return
B
Heating flow
3.5
System diagram (VWL 85/2 A 230 V, VWL
115/2 A 230 V, VWL 155/2 A 230 V)
e
1
3
12
16
17
19
25
23
15
21
14
11
4
24 20
2
22
5 13
8
9
6
7
10
A
B
18
1
Fan
2
Air inlet temperature
sensor
