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EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
www.eps-germany.de
PSI 10000 4U Serie
2.3.4
Installing the water cooling
If present, the water cooling should be connected and any further measures related to water cooling installation
should be carried out before the AC supply for the device is connected, let alone the unit is powered. Correct
installation and connection, test for watertightness and later operation lie in the sole responsibility of the operator
or end user.
2.3.4.1
Requirements
Following requirement for the water and the ambiance must be met:
•
Ambient temperature: max. +50 °C (122 °F)
•
Water intake temperature: min. +15 °C (59 °F), max. 33 °C (92 °F)
•
Rate of flow: min. 12 l/min (3.17 gal/min)
•
Corrosion protection (additive): Ethylene glycol
•
Water hardness: soft (calcium carbonate <2 mmol/l)
•
Water pressure: min. 1 bar (14 psi), max. 4 bar (58 psi)
2.3.4.2
Connection point
The device has three separate cooling blocks internally, each with its own water pipe. All pipes are led out and
connected outside of the device. The water will thus flow through all three pipes in parallel. On the rear of the
device are two taps (tee pieces) for water connection:
Tap: tee piece
Thread: M16x1.5
Which one of the two taps is used for intake and outlet is arbitrary. For later use it’s only
important to have a sufficient amount of water flowing through the pipes, along with a
certain water intake temperature.
The hose connection is either directly done on the tee, using the metric thread, or by
using a hose tail swivel, for example one from company Schwer Fittings, type SA-DKL90.
This swivel is already sealing upon mount, using a 24° metal cone.
2.3.4.3
Operation and supervision
Once the water cooling is installed and running, there is one primary value left to supervise permanently, the so-
called dew point. Depending on the temperature of water on the intake in combination with the humidity of ambient
air and also the air inside the device water can condensate, i. e. dew inside the device. This must avoided under
all circumstances! It means, it might be required to have regulated water cooling system in order to react to varying
ambient conditions.
The dew point is defined in several norms, for instance DIN 4108. The table below defines the dew point (air hu
-
midity to water)
in °C in the upper table
and i
n °F in the lower table
at specific ambient temperatures and air
humidity levels. The intake water temperature must always be higher than the dew point:
Ambient
Relative air humidity in per cent
45%
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
14°C
2.2
3.76
5.1
6.4
7.58
8.67
9.7
10.71
11.64
12.55
13.36
15°C
3.12
4.65
6.07
7.36
8.52
9.63
10.7
11.69
12.62
13.52
14.42
16°C
4.07
5.59
6.98
8.29
9.47
10.61
11.68
12.66
13.63
14.58
15.54
17°C
5
6.48
7.92
9.18
10.39
11.48
12.54
13.57
14.5
15.36
16.19
18°C
5.9
7.43
8.83
10.12
11.33
12.44
13.48
14.56
15.41
16.31
17.25
19°C
6.8
8.33
9.75
11.09
12.26
13.37
14.49
15.47
16.4
17.37
18.22
20°C
7.73
9.3
10.72
12
13.22
14.4
15.48
16.46
17.44
18.36
19.18
21°C
8.6
10.22
11.59
12.92
14.21
15.36
16.4
17.44
18.41
19.27
20.19
22°C
9.54
11.16
12.52
13.89
15.19
16.27
17.41
18.42
19.39
20.28
21.22
23°C
10.44
12.02
13.47
14.87
16.04
17.29
18.37
19.37
20.37
21.34
22.23
24°C
11.34
12.93
14.44
15.73
17.06
18.21
19.22
20.33
21.37
22.32
23.18
25°C
12.2
13.83
15.37
16.69
17.99
19.11
20.24
21.35
22.27
23.3
24.22
26°C
13.15
14.84
16.26
17.67
18.9
20.09
21.29
22.32
23.32
24.31
25.16
27°C
14.08
15.68
17.24
18.57
19.83
21.11
22.23
23.31
24.32
25.22
26.1
28°C
14.96
16.61
18.14
19.38
20.86
22.07
23.18
24.28
25.25
26.2
27.18
29°C
15.85
17.58
19.04
20.48
21.83
22.97
24.2
25.23
26.21
27.26
28.18
30°C
16.79
18.44
19.96
21.44
23.71
23.94
25.11
26.1
27.21
28.19
29.09
32°C
18.62
20.28
21.9
23.26
24.65
25.79
27.08
28.24
29.23
30.16
31.17
34°C
20.42
22.19
23.77
25.19
26.54
27.85
28.94
30.09
31.19
32.13
33.11
