© EPS Stromversorgung in 2022, this information is subject to change without notice
33
30000800_manual_psb_10000_4u_30kw_en_04
2.3.4
Connection to water supply (WC models)
If already available, the water supply 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
The water pipe construction is identical with all models in this series but due to the rated current and hence different heat dis-
sipation per minute in the internal cooling block, a model depending requirement to the water and the ambiance must be met:
Model
10 V / 60 V / 80 V
200 V to 2000 V
Internal water flow:
Series
Series
Ambient temperature:
Max. +50 °C (122 °F)
Max. +50 °C (122 °F)
Water intake temperature (min):
See dew point tables below
See dew point tables below
Water intake temperature (max):
+33 °C (82 °F)
+26 °C (91 °F)
Flow rate:
Min. 12 l/minute (3.17 gal/minute)
Min. 7 l/minute (1.85 gal/minute)
Corrosion protection:
Ethylene glycol
Ethylene glycol
Water hardness:
Soft (calcium carbonate < 2 mmol/l)
Soft (calcium carbonate < 2 mmol/l)
Water pressure:
Min. 1 bar (14 psi), max. 4 bar (58 psi)
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: angle piece
Thread: M16x1.5
Which one of the two taps is used for intake and outlet is arbitrary. For later use it’s only import-
ant 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 or end piece, 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 humidity to wa
-
ter)
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
