2. Depressurize the compressor and drain the oil by opening the drain valve on the oil separator vessel.
See section Oil and oil filter change.
3. Resume oil change as described in section Oil and Filter Change in this book.
Units with the energy recovery option are factory filled with 8000 h oil.
The oil should be changed every 4000 h 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 your customer centre.
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.
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
Modifying settings
If the programmed warning settings for the water temperatures are exceeded, a warning indication is shown
on the controller:
Instruction book
124 2920 7180 30
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