Frick XJS 95M User Manual

070-450 IOM (NOV 13)
Page 23
XJF ROTARY SCREW COMPRESSOR
MAINTENANCE
should be performed on a regular basis. It is a valuable tool
that can identify the presence of moisture, acid, metallics
and other contaminants that will shorten compressor life if
not corrected. In addition, an analysis of the compressor
vibration should be made periodically.
VIBRATION ANALYSIS
Periodic vibration analysis can be useful in detecting bearing
wear and other mechanical failures. If vibration analysis is
used as a part of your preventive maintenance program,
take the following guidelines into consideration.
1. Always take vibration readings from exactly the same
places and at exactly the same percentage of load.
2. Use vibration readings taken from the new unit at start-
up as the baseline reference.
3. Evaluate vibration readings carefully as the instrument
range and function used can vary. Findings can be easily
misinterpreted.
4. Vibration readings can be inuenced by other equipment
operating in the vicinity or connected to the same piping as
the unit.
OIL QUALITY AND ANALYSIS
High quality and suitable oil is necessary to ensure
compressor longevity and reliability. Oil quality will rapidly
deteriorate in systems containing moisture and air or other
contaminants. In order to ensure the quality of the oil in the
compressor unit:
1. Only use Frick oil or high quality oils approved by Johnson
Controls - Frick for your application.
2. Only use Frick lter elements. Substitutions must be
approved in writing by Johnson Controls - Frick engineering
or warranty claim may be denied.
3. Participate in a regular, periodic oil analysis program to
maintain oil and system integrity.
OPERATING LOG
The use of an operating log as included in this manual
permits thorough analysis of the operation of a system by
those responsible for its maintenance and servicing.
Continual recording of gauge pressures, temperatures, and
other pertinent information, enables the observer and
serviceman to be constantly familiar with the operation of
the system and to recognize immediately any deviations
from normal operating conditions. It is recommended that
readings be taken at least daily.
MAINTENANCE SCHEDULE
The schedule below should be followed to ensure trouble-
free operation of the compressor unit.
TROUBLESHOOTING GUIDE
Successful problem solving requires an organized approach
to dene the problem, identify the cause, and make the
proper correction. Sometimes it is possible that two
relatively obvious problems combine to provide a set of
symptoms that can mislead the troubleshooter. Be aware of
this possibility and avoid solving the “wrong problem”.
ABNORMAL OPERATION ANALYSIS AND CORRECTION
Four logical steps are required to analyze an operational
problem effectively and make the necessary corrections:
1. Dene the problem and its limits.
2. Identify all possible causes.
3. Test each cause until the source of the problem is found.
4. Make the necessary corrections.
The rst step in effective problem solving is to dene
the limits of the problem. The following list of abnormal
system conditions can cause abnormal operation of the XJF
compressor:
1. Insufcient or excessive refrigerant or gas load.
2. Excessively high suction pressure.
3. Excessively high discharge pressure.
4. Excessively high or low temperature coolant to the oil
cooler.
5. Excessive liquid entering the compressor (slugging).
6. Insufcient oil cooling.
7. Excessive oil cooling
8. Incorrect gas line sizing.
9. Improper system piping.
10. Wrong operation of hydraulic operated slide valve.
11. Problems in electrical service to compressor.
12. Moisture present in the system.
Make a list of all deviations from normal compressor
operation. Delete any items, which do not relate to the
symptom and separately list those items that might relate
to the symptom. Use the list as a guide to further investigate
the problem.
The second step in problem solving is to decide which
items on the list are possible causes and which items are
additional symptoms. High discharge temperature and high
oil temperature readings on a display may both be symptoms
of a problem and not causally related.
The third step is to identify the most likely cause and take
action to correct the problem. If the symptoms are not
relieved, move on to the next item on the list and repeat the
procedure until you have identied the cause of the
problem. Once the cause has been identied and conrmed
make the necessary corrections.
SLIDE VALVE TRANSMITTER
REPLACEMENT
The Slide Valve Transmitter (Figure 15) is located on the
right side of the compressor (facing shaft) at the inlet end.
The linear transmitter with hermetic enclosure is based on
the inductive measuring principle. It features removable
electronics (from the sensor well) eliminating the need to
evacuate the compressor for replacement. This type of
transmitter is dedicated to volume ratio control and has no
user adjustments.
1. Shut off control power.
2. Remove DIN connector plug from transmitter.
3. Loosen set screws.
4. Remove transmitter unit.
5. Install new transmitter unit.
6. Tighten set screws.
7. Apply DIN connector plug to transmitter.
8. Turn on control power.

Frick XJS 95M Specifications

General

Brand	Frick
Model	XJS 95M
Category	Air Compressor
Language	English