• Remote control: The compressor will react to commands from external switches. Emergency stop remains
active. Compressor start/stop commands via Clock function are still possible.
Options:
• Remote starting and stopping (switch S1')
• Remote loading/unloading (switch S4')
• Remote pressure sensing (switch S' combined with pressure switch S4')
Have the modifications checked by Atlas Copco.
Stop the compressor and switch off the voltage before connecting external equipment.
Only potential-free contacts are allowed.
• LAN control: The compressor is controlled via a local network. Consult Atlas Copco.
See section Electrical system to locate the connectors.
7.4 Cooling water requirements
General
Cooling water needs to fulfill certain requirements in order to avoid problems of scaling,
fouling, corrosion or bacterial growth.
In open circuit cooling towers, protective measures must be taken to avoid the growth of
harmful bacteria such as legionella pneumophila when there is a risk of inhalation of the
water droplets.
No general recommendation can encompass the effects of all combinations of the various compounds, solids
and gases typically found in cooling water in interaction with different materials. Therefore the
recommendations formulated in our Cooling Water Specifications are a general guide line for acceptable
coolant quality. However, where strict limits apply, a statement is made in the specification.
The water requirements refer to untreated water. When water is treated, some parameters will change. Water
treatments should be carried out by a specialized water treatment company, taking the responsibility for the
performance of the treated cooling water and the compatibility with the materials in the cooling circuit. This
includes not only the selection of the appropriate additives, but also the correct application, monitoring of
concentrations and properties, prevention of sludge formation and maintenance of the system. This applies
also to treatment with antifreeze products. They must be provided with suitable stabilizers and inhibitors.
Specifications are also depending on the type of cooling circuit (open, once through / recirculating with tower /
closed) and on the application (Standard – max 65 °C cooling water temperature at the outlet) or Energy
Recovery (water temperature up to 95 °C).
In case water is not in line with recommended values or if any doubt, consult the manufacturer.
Cooling water parameters
1. pH
The effect of pH is already included in the Ryznar Stability Index (RSI - see item 4 below), but also the
pH itself is subject to limitations:
Instruction book
154 2920 7109 60
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