Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 259)

4-54 Commissioning
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
7. After several minutes of running the pumps, the conductivity
should come down and the pressure should be relatively stable
around 345 kPa (50 psi) or as specified on the piping scheme
inside the pump cabinet door. At this point you can reset the
alarms in the cooling system and the pumps should begin to run
automatically, removing air from the system. Use the door-
mounted switch to alternate between pumps at 10-minute
intervals, and continually monitor the system for leaks.
8. Continue to fill the system and eliminate air by running the main
pumps for several hours. The normal operating level of the fluid
is halfway between the upper level switch (LS) and top of the
reservoir. Air in the system can be observed in the mesh filter
(located in Figure 4.21), in the strainer STR1 or in the clear tubes
within the machine converter or line converter. Pump surging or
bubbling within the reservoir also indicates air is in the system.
Run the main pump under “normal operation” until the air has
been purged.
Reservoir
Level Switch (LS)
Level Shut Down Low (LSDL)
De-ionization
Cartridge DEI1
Mesh Filters
Reservoir
Level Switch (LS)
Level Shut Down Low (LSDL)
De-ionization
Cartridge DEI1
Mesh Filters
Figure 4.21 – Mesh Filters and De-ionizing Cartridge
9. The liquid-to-air heat exchanger is a major source of trapped air
within the system, especially if the heat exchanger is mounted at
an elevation higher that the reservoir. Some systems will come
with purge valves out at the heat exchanger, and these should be
used to help remove air from the system.