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IRN37 - 160K - CC & IRN50 - 200H -CC & IRN75 - 160K - 2S & IRN100 - 200H - 2S & IRN 250 - 300H - 2S
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10.0 MAINTENANCE
Blower motor Re−Grease
(N75−160 Aircooled units)
6 Months or 4000 Hrs
Apply high melting point grease into the blower motor
drive end bearing using a grease gun at the nipple
provided.
Stop when excess grease is seen at the relief port.
Main motor Re−Grease instructions
HPM 250L motor Re-Grease (N250/300N-2S units only)
Every 2000 hours
Apply Exxon Polyrex - EM or Mobilith - CHC 220 grease
into main motor drive end and non-drive end bearings
using a grease gun at the nipple provided.
Drive end and non-drive end grease quantity 75 grams.
Stop when excess grease is seen at the relief port.
Coolant hoses
The flexible hoses that carry coolant 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 coolant. It is recommended to
drain the coolant into a clean container. Cover the
container to prevent contamination. If the coolant
is contaminated, a new charge of coolant must be
used.
Remove the hose.
Install the new hose and refill the unit with coolant.
Start the compressor, check for leaks and check
coolant level. Refill as necessary
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. Adjust 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 dis-
charge ports of the valve during pressure relief
valve check. Wear ample clothing, gloves, safety
glasses and ear protection during valve testing.
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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.
Air filter change procedure
Unclip the retaining cap and withdraw the old
element.
Fit the new element and refit the retaining cap.
Air filter change procedure N250/300H−2S
Loosen wing nut on top of inlet filter housing. Lift
cover up and away to expose elements.
Carefully remove the old element to prevent dirt
from entering the the compressor inlet.
Thoroughly clean the element housing and wipe all
surfaces
Install new element and inspect to ensure that they
have seated properly.
Install top of inlet filter housing.
Inspect the rubber seal on the retainer wing nut and
replace seal if required.
Tighten wing nuts.
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.
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