D-EIMWC003H02-18_02EN - 25/34
purge circuit with
inert gas
(e.g. nitrogen);
evacuate to a pressure of 0,3 (abs.) bar (or 0,03 MPa);
purge again with
inert gas
(e.g. nitrogen);
open the circuit.
The area should be checked with an appropriate refrigerant detector prior to and during any hot
work to make the technician aware of a potentially flammable atmosphere.
If compressors or compressor oils are to be removed, it should be ensured that it has been
evacuated to an acceptable level to ensure that there is no flammable refrigerant remaining
within the lubricant.
Only refrigerant recovery equipment designed for use with flammable refrigerants should
be employed.
If the national rules or regulations permit the refrigerant to be drained, this should be done safely,
using a hose, for example, through which the refrigerant is discharged into the outside
atmosphere in a safe area. It should be ensured that an inflammable explosive refrigerant
concentration cannot occur in the vicinity of an ignition source or penetrate into a building under
any circumstance.
In the case of refrigerating systems with an indirect system, the heat-transfer fluid should be
checked for the possible presence of refrigerant.
After any repair work, the safety devices, for example refrigerant detectors and mechanical
ventilation systems, should be checked and the results recorded.
It should be ensured that any missing or illegible label on components of the refrigerant circuit is
replaced.
Sources of ignition should not be used when searching for a refrigerant leak.
4.2
Pressure/Temperature Table
HFC-134a Pressure/Temperature Table
°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
10,3
70
20,17
-6
1,34
20
4,72
46
10,9
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
6,7
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
HFO-R1234ze(E) Pressure/ Temperature conversion table
°C
kPa
°C
kPa
°C
kPa
°C
kPa
°C
kPa
-15 20
4
150
23
369
43
731
62
1239
-14 25
5
159
25
399
44
754
63
1271
-13 30
6
169
26
414
45
776
64
1304
-12 36
7
178
27
430
46
800
65
1337
-11 42
8
188
28
445
47
823
66
1370
-10 47
9
198
29
462
48
848
67
1405
-9 53
10
208
30
478
49
872
68
1440
-8 60
11
219
31
496
50
898
69
1475
