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Saturated bubble
(relative)
point temp., °C
1
-28,55
1,25
-25,66
1,5
-23,01
1,75
-20,57
2
-18,28
2,25
-16,14
2,5
-14,12
2,75
-12,21
3
-10,4
3,25
-8,67
3,5
-7,01
3,75
-5,43
4
-3,9
4,25
-2,44
4,5
-1,02
4,75
0,34
5
1,66
5,25
2,94
5,5
4,19
5,75
5,4
6
6,57
6,25
7,71
6,5
8,83
6,75
9,92
7
10,98
7,25
12,02
7,5
13,03
7,75
14,02
8
14,99
8,25
15,94
8,5
16,88
8,75
17,79
9
18,69
9,25
19,57
9,5
20,43
9,75
21,28
10
22,12
10,25
22,94
15.10 - Compressors
The compressors do not require any specific maintenance.
Nevertheless the preventive system maintenance operations
prevent specific compressor problems. The following periodic
preventive maintenance checks are strongly recommended:
•
Check the operating conditions (evaporating tempera-
ture, condensing temperature, discharge temperature,
heat exchanger temperature difference, superheat,
subcooling). These operating parameters must always
be within the compressor operating range.
•
Check that the safety devices are all operational and
correctly controlled.
•
Check oil level and quality. If there is a colour change in
the sight glass, check the oil quality. This may include an
acidity test, moisture control, a spectrometric analysis etc.
•
Check the leak tightness of the refrigerant circuit.
•
Check the compressor motor power input, as well as
the voltage imbalance between phases.
•
Check the tightening of all electrical connections.
•
Ensure that the compressor is clean and runs correctly;
verify that there is no rust on the compressor shell and
no corrosion or oxydation at the electrical connections
and the piping.
40
Characteristics of R-407C
Saturated dew
bar
point temp., °C
(relative)
-21,72
10,5
-18,88
10,75
-16,29
11
-13,88
11,25
-11,65
11,5
-9,55
11,75
-7,57
12
-5,7
12,25
-3,93
12,5
-2,23
12,75
-0,61
13
0,93
13,25
2,42
13,5
3,85
13,75
5,23
14
6,57
14,25
7,86
14,5
9,11
14,75
10,33
15
11,5
15,25
12,65
15,5
13,76
15,75
14,85
16
15,91
16,25
16,94
16,5
17,95
16,75
18,94
17
19,9
17,25
20,85
17,5
21,77
17,75
22,68
18
23,57
18,25
24,44
18,5
25,29
18,75
26,13
19
26,96
19,25
27,77
19,5
28,56
19,75
Saturated bubble
Saturated dew
point temp., °C
point temp., °C
23,74
29,35
24,54
30,12
25,32
30,87
26,09
31,62
26,85
32,35
27,6
33,08
28,34
33,79
29,06
34,5
29,78
35,19
30,49
35,87
31,18
36,55
31,87
37,21
32,55
37,87
33,22
38,51
33,89
39,16
34,54
39,79
35,19
40,41
35,83
41,03
36,46
41,64
37,08
42,24
37,7
42,84
38,31
43,42
38,92
44,01
39,52
44,58
40,11
45,15
40,69
45,71
41,27
46,27
41,85
46,82
42,41
47,37
42,98
47,91
43,53
48,44
44,09
48,97
44,63
49,5
45,17
50,02
45,71
50,53
46,24
51,04
46,77
51,55
47,29
52,05
ATTENTION: The compressor and piping surface tempe-
ratures can in certain cases exceed 100°C and cause burns.
Particular caution is required during maintenance
opera-tions. At the same time, when the compressor is in
operation, the surface temperatures can also be very cold
(down to -15°C for units with a low leaving water
temperature), and can cause frost burns.
15.11 - Evaporator and condenser maintenance
There is no particular maintenance necessary on the plate
heat exchanger. Check:
•
that the insulating foam has not become detached or
damaged during work on the units,
•
that the entering and leaving water temperature
sensors are well connected
•
the cleanliness on the water heat exchanger side (no
signs of leaks).
•
that the periodic inspections required by local regu-
lations have been carried out.
15.12 - Corrosion check
All metallic parts of the unit (chassis, casing panels, control
boxes, heat exchangers etc.) are protected against corrosion
by a coating of powder or liquid paint. To prevent the risk
of blistering corrosion that can appear when moisture
penetrates under the protective coatings, it is necessary to
carry out periodic checks of the coating (paint) condition.
bar
Saturated bubble
(relative)
point temp., °C
20
47,81
20,25
48,32
20,5
48,83
20,75
49,34
21
49,84
21,25
50,34
21,5
50,83
21,75
51,32
22
51,8
22,25
52,28
22,5
52,76
22,75
53,24
23
53,71
23,25
54,17
23,5
54,64
23,75
55,1
24
55,55
24,25
56,01
24,5
56,46
24,75
56,9
25
57,35
25,25
57,79
25,5
58,23
25,75
58,66
26
59,09
26,25
59,52
26,5
59,95
26,75
60,37
27
60,79
27,25
61,21
27,5
61,63
27,75
62,04
28
62,45
28,25
62,86
28,5
63,27
28,75
63,67
29
64,07
29,25
64,47
Saturated dew
point temp., °C
52,55
53,04
53,53
54,01
54,49
54,96
55,43
55,9
56,36
56,82
57,28
57,73
58,18
58,62
59,07
59,5
59,94
60,37
60,8
61,22
61,65
62,07
62,48
62,9
63,31
63,71
64,12
64,52
64,92
65,31
65,71
66,1
66,49
66,87
67,26
67,64
68,02
68,39
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