Periodic
Maintenance
For units with the discharge valve
option:
1. Closed the angle valve placed on
the refrigerant liquid line to store
the refrigerant in the condenser.
2. After the compressor stops,
closed 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 refrigerant
remaining 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.
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. Charge the unit with refrigerant
R134a (refer to the refrigerant
charging paragraph).
14. Open all the valves before
restarting the chiller.
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