035-19569-101 (0109)
7-7
GB
4. After the tubes have been corked for 12 to 24 hours,
it is recommended that two men working at both
ends of the evaporator carefully test each tube – one
man removing corks at one end and the other at the
opposite end to remove corks and handle the leak
detector. Start with the top row of tubes in the section
being investigated. Remove the corks at the ends
of one tube simultaneously and insert the exploring
tube for 5 seconds – this should be long enough to
draw into the detector any refrigerant gas that might
have leaked through the tube walls. A fan placed at
the end of the evaporator opposite the detector will
assure that any leakage will travel through the tube
to the detector.
5. Mark any leaking tubes for later identifi cation.
6. If any of the tube sheet joints are leaking, the leak
should be indicated by the detector. If a tube sheet
leak is suspected, its exact location may be found
by using a soap solution. A continuous buildup of
bubbles around a tube indicates a tube sheet leak.
7.6 Compressor
Maintenance for the compressor assembly consists
of checking the operation of the oil return system and
changing the dehydrator, checking and changing the
oil, checking and changing the oil filters, checking
the operation of the oil heater, checking the operation
of the oil pump, and observing the operation of the
compressor.
Internal wearing of compressor parts could be a serious
problem caused by improper lubrication, brought about
by restricted oil lines, passages, or dirty oil fi lters. If the
unit is shutting down on (HOT) High Oil Temperature
or Low Oil Pressure (OP), change the oil fi lter element.
Examine the oil filter element for the presence of
aluminum particles. Aluminum gas seal rings can contact
the impeller and account for some aluminum particles
to accumulate in the oil fi lter, especially during the initial
start up and fi rst several months of operation. However,
if aluminum particles continue to accumulate and the
same conditions continue to stop the unit operation after
a new fi lter is installed, contact your local York Service
Agent.
1. Oil Filter - The oil fi lter must be changed when the
variable speed oil pump (VSOP) Drive frequency
increases to 55 Hz to maintain the target oil
pressure
When the oil fi lter is changed, it should be inspected
thoroughly for any aluminum particles which would
indicate possible bearing wear. If aluminum particles
are found this should be brought to the attention of
the nearest York offi ce for their further investigation
and recommendations.
2. Oil Changing - The oil in the compressor must be
changed annually or earlier if it becomes dark or
cloudy. However, quarterly oil analysis can eliminate
the need for an annual change provided the analysis
indicates there is no problem with the oil.
7.7 Compressor Motor
1. Check motor mounting screws frequently for
tightness.
2. Check motor winding insulation annually for
deterioration of windings.
3. For the lubrication instructions, refer to the motor
manual
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