KAESER ESD 352 SFC, Technical Documentation Manual, Page: 57 / 413

If the ground conductor on the supply side is smaller than 6 AWG, use one of the following options:
■ Use a multi-core conductor (including ground conductor) appropriately sized to handle the FLA
of the compressor with a minimum 6 AWG ground,
■ If the ground wire is separate from the current-carrying conductors, a size 6 AWG wire should
be used,
■ Use a second ground conductor equal to the supply line ground,
■ Use a ground fault interrupt device to disconnect the feeders when a fault condition occurs
Mains voltage: 480V±10%/3/60Hz
ESD 442
Pre-fuse [A] 600
Supply 2x4 xMCM 400
Consumption [A] 443
Tab. 18 Connection data
2.15 Option K2/K9
Water cooling
Cooling oil may contaminate the cooling water if a leak occurs.
➤ A special heat exchanger must be used for heating drinking water.
The specific heat capacity and required volume flow rate of the cooling water changes if anti‐
freeze is added.
➤ Consult KAESER Service to ensure optimum cooling-system performance.
➤ Comply with the specified minimum requirements for the cooling water in order to avoid
downtimes due to corrosion, calcification and contamination.
It is imperative that measures for cooling water treatment and filtration are implemented and
performed.
KAESER can provide the names of companies specialising in cooling water analysis and the
supply of suitable treatment devices.
The following design types are available:
■ Option K2 Water cooling with plate heat exchanger: Chapter 2.15.1
■ Option K9: Water cooling with bundled pipe heat exchanger: Chapter 2.15.2
Open cooling system
An open cooling system may be a cooling circuit with open cooling towers for cooling via evapora‐
tion. As a portion of the cooling water evaporates, it must be replenished regularly. During evapora‐
tion, the material content of the cooling water concentrates and the contact with ambient air can
contaminate the cooling water. When replenishing cooling water, you must ensure the minimum re‐
quirements for the cooling water.
Closed cooling system
In a closed cooling system, the cooling water has not contact with the atmosphere. Thus, it cannot
be contaminated by the atmosphere or enriched with oxygen, for example.
2 Technical Specifications
2.15 Water cooling
ESD_2C_10357405_10–LIN_00 E
Service Manual Screw Compressor
ESD 442/14 bar (abs) SFC SIGMA CONTROL 2
11