Maintenance
Figure 15 - Oil filter change
1. Oil charging valve
2. Oil pressure control port
3. Oil pressure control port
Figure 16 - Oil filter pressure drop
Normal pressure drop |
Maximum pressure drop |
Oil filter pressure drop (bar) |
Condensing Pressure - Suction Pressure (bar)
12.Charge the unit with refrigerant R134a refer to charging procedure).
For units with the discharge valve option:
1.Close the angle valve placed on the refrigerant liquid line to store the refrigerant in the condenser.
2.After the compressor stops, close the compressor discharge valve and disconnect the unit.
Note: Do not make successive vacuums by using the compressor. Irreversible compressor damage could occur.
3. Vacuum the remaining refrigerant | |
| in the evaporator. |
4. | Remove the seven bolts on the oil |
| filter cover. A pan may be |
| necessary to catch any oil that is |
| released after the cover is |
| loosened. |
5. | Remove the cover and the oil filter |
| element. |
6. | Install the new filter element. |
7. Coat the new cover gasket with | |
| refrigerant oil. |
8. | Install the cover plate and cover |
| plate gasket. |
9. | Install a new copper gasket under |
| the bolt head that had one at time |
| of removal. Replace all other bolts |
| and tighten to 89.5 Nm. |
For units without discharge valve option
1.Shut off the compressor and disconnect all electrical service to the compressor.
2.Vacuum the refrigerant out of the circuit.
3.Remove the seven bolts on the oil filter cover. A pan may be necessary to catch any oil that is released after the cover is loosened.
4.Remove the cover and the oil filter element.
5.Install the new filter element.
6.Coat the new cover gasket with refrigerant oil.
7.Install the cover plate and cover plate gasket.
8.Install a new copper gasket under the bolt head that had one at time of removal. Replace all other bolts and tighten to 89.5 Nm.
9.Vacuum the refrigerant circuit at 500 micron and isolate the vacuum pump.
10.Confirm that no moisture or leaks are present by letting the vacuum stand for 2 hours.The pressure should not raise more than
250 microns.
11.Charge the unit with oil, in a quantity equal to what has been removed, by using the charging valve placed on the oil filter.
Note: the oil is very sensitive to moisture. Use the oil immediately after the oil can has been opened.
10. Vacuum the refrigerant circuit at |
500 micron and isolate the |
vacuum pump. |
11. Confirm that no moisture or leaks |
are present by letting the vacuum |
stand for 2 hours.The pressure |
should not raise more than |
250 microns. |
12. Charge the unit with oil, in a |
quantity equal to what has been |
removed, by using the charging |
valve placed on the oil filter. |
Note: the oil is very sensitive to moisture. Use the oil immediately after the oil can has been opened.
13.Open all the valves before restarting the chiller.
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