Stopping the unit for a long period
In case of an open water system and/or if freezing temperatures can be expected, isolate the compressor water
system and blow it through with compressed air.
6.4 Maintenance
Compressor oil
For references used consult section Energy recovery unit.
Oil change:
1. Check if the wheel (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.
4. Resume oil change as described in section Oil and Filter Change in this book.
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.
6.5 Energy recovery data
Reference conditions
See section Reference conditions and limitations.
Effective working pressure
Consult section Compressor data for the normal working pressure.
Maximum allowed pressure of the heat exchanger
Oil side 15 bar (217 psi)
Water side 10 bar (145 psi)
Reading settings
In addition to other data, the following temperatures can be read on the Elektronikon display:
Instruction book
144 2920 7109 60
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