On VSD compressors: close the air outlet valve and run the unit at minimum speed for a few minutes before
isolating the energy recovery system from the compressor.
Stopping the unit for a long period
In case of an open water system and if freezing temperatures can be expected, isolate the compressor water
system and blow it through with compressed air.
5.4
Maintenance
Compressor oil
For references used consult section
Oil change:
1. Check if handle (V1) is totally turned in clockwise (energy recovery in use).
2. Run the unit until warm. Stop the unit, switch off the isolating switch and close the air outlet valve of the
compressor.
3. Depressurize the compressor and drain the oil by opening the drain valve. Also drain the oil from the heat
exchanger by removing the drain plug on the oil piping of the ER-unit. Reinstall the drain plug after
draining.
Thermostatic bypass valves
The inserts (thermostats) must be replaced by new ones when abnormal function is noticed. Examples:
regulating temperature is not within the normal range, ER heat exchanger remains cold,...
Heat exchanger (HE)
If the temperature rise over the energy recovery system declines over a period of time with the same basic
working conditions, the heat exchanger should be inspected. To clean the oil side, soak the heat exchanger in
a degreasing solution. To remove scale formation in the water compartment, a proper descaling process should
be applied. Consult Atlas Copco.
5.5
Energy recovery data
Reference conditions
See section
Reference conditions and limitations
Effective working pressure
Consult section
Compressor data
for the normal working pressure.
Reading settings
In addition to other data, the following temperatures can be read by pressing the scroll key:
•
For air-cooled units:
• The water inlet temperature of the energy recovery system.
• The water outlet temperature of the energy recovery system.
Instruction book
2920 1634 04
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