80448608 Rev B
73
EN
Blower Motor Re−grease
(N75−160 Aircooled units)
6 Months or 4000 Hrs.
Apply high melting point grease into the blower motor
bearings using a grease gun at the nipple provided.
Stop when excess grease is seen at the relief port.
Oil Hoses
The flexible hoses that carry oil through the cooling
system may become brittle with age and will require
replacement. Have your local
Ingersoll Rand
Distributor
or Air Center inspect them every 3 months and replace
them as needed or every 2 years.
Depending on the location of the hose, it may contain
compressor oil. It is recommended to drain the oil
into a clean container. Cover the container to prevent
contamination. If the oil is contaminated, a new charge
of oil must be used.
Remove the hose.
Install the new hose and refill the unit with oil. Start the
compressor, check for leaks and check coolant level. Refill
as necessary.
Replace the oil fill plug and tighten.
Pressure Relief Valve Check
The pressure relief valve must be frequently tested and
regularly maintained. Remove from the machine and check
for the correct operating pressure. Correct, replace as
necessary. If operating conditions are particularly severe, the
frequency of testing and maintenance must be increased
accordingly. A pressure relief valve check must also be
performed at the end of any non−service period. The user
must establish the frequency of such tests as it is influenced
by such factors as the severity of the operating environment.
CAUTION
High pressure air will discharge through the discharge
ports of the valve during pressure relief valve check.
Wear ample clothing, gloves, safety glasses and ear
protection during valve testing.
Run the compressor for about 10 minutes by venting air from
the system to let the unit warm up. With the unit running,
test at or near the maximum operating pressure by opening
the valve for the minimum period required to flush the valve
seat free of debris. This can be accomplished by holding
the test lever fully open or unscrewing the spring pressure
retaining cap, depending on the type of valve installed. If
there is no evidence of discharge or the valve does not fully
close, discontinue use of equipment and contact a licensed
contractor or qualified service personnel.
The pressure relief valve should also be tested and
re−calibrated in accordance with any national or local codes
that may exist. If no code exists, IR recommend that the
pressure relief valve is recalibrated at intervals of one year.
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Air Filter Change Procedure
Unclip (or unbolt) the retaining cover and remove the old
element(s).
Fit new element(s) and refit the retaining cover.
Aircooled Cooler Cleaning
Ensure that the compressor is isolated from the compressed
air system and is vented of all pressure. When undertaking
any work on the compressor always use certified lifting
equipment and employ sound working principles.
Ensure that the main power disconnect switch is locked off
and tagged.
Visually check the outside of the cooler cores to be certain
that a complete cleaning of the cooler is required. Frequently,
dirt, dust or other foreign material may only need to be
removed with a vacuum to remedy the problem.
When the cooler is covered with a combination of oil, grease
or other heavy substances that may affect the unit’s cooling,
then it is recommended that the cooler cores be thoroughly
cleaned on the outside.
If it is determined that the compressor operating temperature
is higher than normal due to the external passages between
the fins of the cooler cores being restricted with deposits
of foreign material, then the cooler should be removed for
cleaning.
WARNING
Strong cleaners can harm aluminium cooler parts.
Follow cleaner manufacturers instructions for use. Wear
appropriate safety equipment.
The coolers in these machines can either be cleaned by
removing the complete cooler for off site cleaning or ’back
flushing’ in place using a high pressure hose and gaining
access through the holes in the intermediate plenum.
Instructions For Cleaning The Coolers While
Installed In The Compressor.
While cleaning coolers, great care must be taken to protect
the rest of the machine from moisture and contamination by
covering sensitive parts with plastic sheeting.
Remove plenum sheet metal to gain access to the
coolers from the blower side.
Remove the screws securing the access panels on the
cooling plenum and remove covers.
Cover main drive motor, PDM Heat sink blower motor,
drain valve, air filter, and cooling motor variable speed
drive with plastic sheeting to prevent damage from
entrance of cleaning solution.
Cover inlet of blower wheel with plastic sheeting to
prevent entrance of cleaning fluid.
Cover the inlet grill of the intake panel with plastic
sheeting to prevent cleaning solution from exiting the
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MAINTENANCE
RELEASED 06/Feb/2018 13:48:37 GMT
