TECHNICAL MANUAL
CVM 2
C 5001 CV/04-99 GB
5
1.2
Pressure probes
There are two 4-20mA , 0-30 bar pressure probes for all the units, except for the water-water heat pumps with reversing cycle
on the water side.
TERMINALS
MEANING
7, 8
1
st
circuit condensing pressure
9, 10
2
nd
circuit condensing pressure
Pressure [Bar]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Current [mA]
4.00
4.27
4.54
4.80
5.07
5.34
5.61
5.87
Pressure [Bar]
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Current [mA]
6.14
6.41
6.68
6.94
7.21
7.48
7.75
8.01
Pressure [Bar]
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
Current [mA]
8.28
8.55
8.82
9.08
9.35
9.62
9.89
10.15
Pressure [Bar]
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
Current [mA]
11.43
10.69
10.96
11.23
11.49
11.76
12.03
12.30
Pressure [Bar]
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
Current [mA]
12.56
12.83
13.10
13.37
13.63
13.90
14.17
14.44
Pressure [Bar]
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
Current [mA]
14.70
14.97
15.24
15.51
15.77
16.04
16.31
16.58
Pressure [Bar]
24.0
24.5
25.0
25.5
26.0
26.5
27.0
27.5
Current [mA]
16.84
17.11
17.38
17.65
17.92
18.18
18.45
18.72
Pressure transducer verification procedure:
•
switch off the compressors and leave the unit with only the “ON/OFF switch” button ON;
•
disconnect the cable from terminal 7 or 9 of microprocessor, depending on the probe;
•
place digital milliammeter between the disconnected terminal and the cable and read the current value;
•
read the pressure value using a gauge placed near the transducer;
•
compare the readings with the values shown in the table.
