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9.3 Hydro-Unit MCJ
ATTENTION
See factory settings 3-2-2-1
The Hydro-Unit MCJ is fitted with a jockey pump,
especially suited for installations with strongly
fluctuating water consumption. The jockey pump is a
smaller pump with less capacity but the same
pressure as the main pumps of the installation. The
jockey pump will be started first. If the water
consumption is larger than the capacity of the jockey
pump, one or more main pumps will be switched on,
whereas the jockey pump is switched off. If the
capacity of the main pumps is not sufficient, in case of
a large water consumption, the jockey pump will also
be switched on. A Hydro-Unit can also be fitted with 2
jockey pumps which are each other's backups.
Table 18: Specific parameter settings MCJ
Figure 9: 1 jockey pump operation
Figure 10: 1 main pump operation
Figure 11: 2 main pumps operation
Parameter Value
3-3-1 Number of pumps 1
2
3
4
5
6
3-3-2 Inlet Switch
Pressure
Level / valve ON-OFF
Level / valve prop.
3-3-3 Discharge One Jockey
3-5-1 Set point .... kPa
3-5-3 Bandwidth 30
3-5-13 Low pressure alarm 100 kPa
3-6-1 Opt. pump starts/h 30
3-6-2 Min. run time Default 180 s
DOL ≤ 2.2 kW 90 s
3-6-3 Min. run time corr. 10 s
3-6-8 Run-dry delay Default 30 s
Float/level control 1 s
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