6. INSPECTION AND MAINTENANCE
OF THE COMPRESSOR PACKAGE
GRaSSÊï
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6.1 GENERAL
6.3 DAIL Y OPERATION
Although the maintenance tor your Grassoscrew com
pressor is minimal, it must be carried out tor compressor
long life. The instrumentation and indicators provided will
alert you of the first sign of a maintenance requirement. Ob
serve these instruments and indicators at regular intervals
and be certain tha1 the machine is performing properly_
Become familiar with the normal operating sound of the
compressor and if somethïng does not sound just right, shut
down the mç1chine.
After a routine start has been made, observe 1he instru
ments and be sure the gauges indicate the correct reading
for that particular phase of operation.
After the machine has warmed up. check the overall com
pressor and instrument cabinet to make sure it is running
properly. Particular attention should be given to the follow•
lng:
- Oil pressure gauge
Excessive vibration is a good indication that something is
wrong.
This precaution may save the cost of a major repair.
Keep the compressor package clean to minim1ze dtrt enter
ing the compressor whenever cornponents are opened dur
ing routine ma.intenance. Before cleaning a component wtth
a solvent to remove gum resîn like deposits, remove all the
-
O-rings as they can be chemically attacked. To ensure
no
:
races of solvent will be left to react with the oil and refrige
rant, thoroughly dry the component with an air blast
- Oil temperature gauge
- Discharge temperature gauge
Also check the setting of the suction, oil and discharge
pressure safety switches. A log of the operating tempera
tures, pressures and service requirements can be invalu
able in troubleshooting.
lt is recommended 1hat a log be kept of all readings at least
every e1ght hours.
6.2 INSPECTIONS SCHEDULES (Compressor package stays in operation)
FREQUENCY
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CHEC°K POINTS
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REMARKS
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Oil level in primary oil separator
-
•
The oil level must be between 1 and 3 quarters height of the sight
g lass. For topping up oîl, refer to paragraph 6.8,
Colour of oil behind sight glass of
separator
•
The oil should
be
transparently clear. A whi1e colour points to
not dissolved retrigerant (foam).
Oil pressure
•
The indicatlon of the ofl pressure gauge should be 3 bar higher
than the value shown by the discharge pressure gauge.
Pressure drop over oil filter
•
Check for corresponding indication {warning signa!) .
Oi
l
.
temperature on cooler outlet
•
The normal operating temperature must
be between
40 & 50
·c .
---
Oil leakage
•
A!lowable shaft leakage 1 O drops per hour. Remedy any other
vislble oil leakage.
Healing element in oil separator
•
During standstill of the package, the heating element must be
operative_
Setting of safety switches
•
Refer to Chapter 4, paragraph 4.14 .
Switching frequency of the compressor
•
The time interval between s1oppîng and starting of the
compressor drive motor should be at least 10 minutes.
At maximum capacity posltion the indicator should read the
Capacity control
•
maxfmum revolutions as given in table 4.3 on page 4.8 for each
compressor model.
Capacity control actuator cam settings
•
Switch-on and switch-off stops can be read just as given in
paragraoh 6.12_
Number of operating hours
•
Check the number of operating hours in
view
of
any
maîntenance tasks to be carried out.
.\part trom the above check points, the sound produçed by the compressor provides a proper standard tor its mechanical condition, lf abnonnal
sounds are audible, !heir cause should be traced and removed immediately în order to prevent serieus breakdowns at inconvenient times.
92.01
Compressor Package GSLP
Page
6.1
