Atlas Copco GA 45+ - Energy Recovery Data

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.
Units with the energy recovery option are factory filled with 8000h oil.
The oil should be changed every 4000h because the oil temperature is higher in units with
energy recovery.
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 controller display:
• The water inlet temperature of the energy recovery system
• The water outlet temperature of the energy recovery system
For water-cooled units:
• The water inlet temperature of the energy recovery system
• The water outlet temperature of the energy recovery system
• The cooling water outlet temperature of the compressor
Instruction book
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