Atlas Copco GA 55+, Инструкция, Страница: 93 / 150

93
Instruction book
9096 3313 00
In this case, the temperature of the oil leaving heat exchanger (HE) would become too high for the oil
to be injected into compressor element (E). Oil cooler bypass valve (BV1) will open the supply line to
the compressor oil cooler to allow the hot oil to be cooled in cooler (Co).
The amount of energy supplied to the water is adapted to the need of energy.
•
Recovery water flow too high/temperature too low
In this case, bypass valve (BV2) will open the bypass line of the oil separator vessel, allowing colder oil from
heat exchanger (HE) to be mixed with hot oil from separator (AR). Energy is transferred from the
compressor oil to the water, but at a relatively low temperature level.
Energy recovery system not in use
The handle (V1) is completely turned out anti-clockwise.
The oil circuit is the same as without installation of the energy recovery system. No
energy is recovered.
This situation should be considered as exceptional, e.g. in case of maintenance of the energy recovery system or
when no energy is required for a long period.
On fixed speed compressors, run the unit unloaded 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/or 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 Energy recovery unit.
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.
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.