Frick TDSL 193L User Manual

070.250-IOM1 (NOV 2013)
Page 21
TDS_ Rotary Screw Compressor
Maintenance
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.
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 opera tional
problem effectively and make the necessary correc tions:
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. If, for example, the compressor
periodically experiences high oil tempera tures, do not rely
on this observation alone to help identify the problem.
On the basis of this information the apparent corrective
measure would appear to be a readjustment of the liquid
injection system. Lowering the equalizing pres sure on the
thermal expansion valve would increase the refriger ant
feed and the oil temperature should drop.
If the high oil temperature was the result of high suction
superheat, however, and not just a matter of improper
liquid injection adjustment, increasing the liquid feed could
lead to other problems. Under low load conditions the
liquid injection system may have a tendency to overfeed.
The high suction superheat condition, moreover, may only
be temporary. When system conditions return to normal
the units’ liquid injection will overfeed and oil temperature
will drop. In solving the wrong problem a new problem
was created.
When an operating problem develops compare all operat-
ing information on the MAIN OPERATING SCREEN with
normal operating conditions. If an Operating Log has been
maintained the log can help determine what constitutes
normal operation for the compressor unit in that particular
system.
The following list of abnormal system conditions can cause
abnormal operation of the TDS_ compressor:
1.Insufcientorexcessivegasload.
2. Excessively high suction pressure.
3. Excessively high suction superheat.
4. Excessively high discharge pressure.
5. Inadequate refrigerant charge or low receiver oil level.
6. Excessively high or low temperature coolant to the oil
cooler.
7. Liquid return from system (slugging).
8. Refrigerant underfeed or overfeed to evaporators.
9. Blocked tubes in water cooled oil cooler from high min-
eral content of water.
10.Insufcientevaporatororcondensersizing.
11. Incorrect gas/refrigerant line sizing.
12. Improper system piping.
13. Problems in electrical service to compressor unit.
14. Air and moisture present in the system.
Make a list of all deviations from normal plant operation
and normal compressor unit 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 investi gate 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 casually relat ed. High
suction superheat or a low receiver level, however, could
cause both symptoms.
The third step is to identify the most likely cause and
take action to correct the problem. If the symptoms are
not relieved move 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corrections.
Bare compressor replacement
The following procedure is required only when a bare
compressorisreplacedintheeld.
1. Verify that the starter is locked out.
2. Remove gas/refrigerant
3. Remove all tubing, piping, and wiring that is connected
to the compressor.
4. Disconnect the coupling from the driver shaft.
5. While supporting the compressor assembly with a
crane, remove the bolts at the compressor feet.
6. Thoroughly clean the compressor feet and mounting
padsofburrsandotherforeignmattertoensurerm
seating of the compressor.
7. Thoroughly clean the new compressor and remove all
cover plates and protection etc.
8. Install new gaskets and sealing in all connections.
9. Set the new compressor in place and shim feet where
required.
10. Reattach the drive coupling.
11. Check the shaft alignment.
12. Complete tubing, piping, and wiring.

Frick TDSL 193L Specifications

General

Brand	Frick
Model	TDSL 193L
Category	Air Compressor
Language	English