Operating instructions
50
7.3.7 - Oil reclaim filter
The oil reclaim system has a strainer on the eductor suction
line, a strainer on the discharge pressure line, and a filter
on the cooler scavanging line. Replace the filter once per
year or more often if filter condition indicates a need for
more frequent replacement. Change the filter by closing
the filter isolation valves (see Fig. 4 - “Lubrication circuit”)
and progressively opening the flare fitting to relieve the
pressure. Change the strainers once every 5 years or
whenever the cooler is evacuated of refrigerant.
7.3.8 - Inspect refrigerant float system
Perform inspection every year or when the condenser is
opened for service. Transfer the refrigerant into the cooler
vessel (if it includes isolation valves) or into a pumpout
storage tank. Remove the float access cover. Clean the
chamber and valve assembly thoroughly. Be sure that the
valve moves freely. Make sure that all openings are free of
obstructions. Examine the cover gasket and replace if
necessary. See Fig. 35 - “19XR float valve design” for a
view of the float valve design. For linear float valve designs,
inspect orientation of the float slide pin. It must be pointed
toward the bubbler tube for proper operation.
1. Refrigerant inlet from FLASC chamber
2. Linear oat assembly
3. Float screen
4. Bubble line
5. Float cover
6. Refrigerant outlet to cooler
7. Gasket
7.3.9 - Inspect relief valves and piping
Refer to chapter 1 "Safety considerations". The relief valves
on this chiller protect the system against the potentially
dangerous effects of overpressure. These devices must be
kept in peak operating condition.
As a minimum, the following maintenance is required:
• At least once a year, disconnect the vent piping at the
valve outlet and carefully inspect the valve body and
mechanism for any evidence of internal corrosion or
rust, dirt, scale, leakage, etc.
• If corrosion or foreign material is found, do not
attempt to repair or recondition. Replace the valve.
• If the chiller is installed in a corrosive atmosphere or
the relief valves are vented into a corrosive
atmosphere, make valve inspections at more frequent
intervals.
7.3.10 - Verification of the pressure switch calibration
Reverse the three-way valve direction so that the standby
pressure switch will start operation.
Remove the first pressure switch and have its calibration
verified by a qualified body - see annex C paragraph
C6-EN378-2.
Once the calibration has been verified, re-install the
pressure switch on the three-way valve and again reverse
the valve to again permit operation of the pressostat.
7.3.11 - Compressor bearing and gear maintenance
To ensure good bearing and gear maintenance proper
lubrication is imperative. Use the proper grade of oil,
maintained at recommended level, temperature, and
pressure. Inspect the lubrication system regularly and
thoroughly.
To inspect the bearings, a complete compressor teardown
is required. Only a trained service technician should remove
and examine the bearings. The cover plate on older com-
pressor bases was used for factory-test purposes and is not
usable for bearing or gear inspection. The bearings and
gears should be examined for signs of wear.
The frequency of examination is determined by the hours
of chiller operation, load conditions during operation, and
the condition of the oil and the lubrication system. Excessive
bearing wear can sometimes be detected through increased
vibration or increased bearing temperature. If either
symptom appears, contact an experienced and responsible
service organization for assistance.