D-EIMWC00908-16EN - 44/52
Procedure to replenish refrigerant
1.
If the machine has lost refrigerant, it is necessary to first find the causes before carrying out any replenishment
operation. The leak must be found and repaired.
Searching with soap/water solution is a good method and simple methos for medium to large leaks, while an
electronic leak detector is required to find small leaks.
2.
Add refrigerant to the system through the service valve located on the suction pipe or through the Schrader valve
located on the water heat exchanger inlet pipe.
3.
The refrigerant can be added under any load condition (better between 70 and 100%). Suction superheating must
be between 0.5 and 1°C.
4.
Check the subcooling value. The subcooling value must be between 4 and 6°C a. With reference to the above
mentioned values, the subcooling will be lower at 70÷100% load and higher at lower load.
5.
Overcharging the s
ystem will entail a rise in the compressor’s discharge pressure, owing to excessive filling of the
condenser.
Table 7 - Pressure/ Temperature
Pressure/Temperature table for R-134a
°C
bar
°C
bar
°C
bar
°C
bar
-14
0,71
12
3,43
38
8,63
64
17,47
-12
0,85
14
3,73
40
9,17
66
18,34
-10
1,01
16
4,04
42
9,72
68
19,24
-8
1,17
18
4,37
44
10,30
70
20,17
-6
1,34
20
4,72
46
10,90
72
21,13
-4
1,53
22
5,08
48
11,53
74
22,13
-2
1,72
24
5,46
50
12,18
76
23,16
0
1,93
26
5,85
52
13,85
78
24,23
2
2,15
28
6,27
54
13,56
80
25,33
4
2,38
30
6,70
56
14,28
82
26,48
6
2,62
32
7,15
58
15,04
84
27,66
8
2,88
34
7,63
60
15,82
86
28,88
10
3,15
36
8,12
62
16,63
88
30,14
Summary of Contents for EWWD320
Page 16: ...D EIMWC00908 16EN 16 52 Figure 4 Evaporator pressure drop...
Page 17: ...D EIMWC00908 16EN 17 52...
Page 18: ...D EIMWC00908 16EN 18 52 Figure 5 Condenser pressure drop...
Page 34: ...D EIMWC00908 16EN 34 52 Figure 12 Compressor overview...
Page 50: ...D EIMWC00908 16EN 50 52...
Page 51: ...D EIMWC00908 16EN 51 52...
