10.0 MAINTENANCE
IRN37–160K–CC & IRN50–200H–CC & IRN75–160K–2S & IRN100–200H–2S
73
Watercooled Cooler Cleaning
A periodic inspection and maintenance program
should be implemented for watercooled heat
exchangers. The following steps should be taken:
S
Inspect filters in system and replace or clean as
required.
S
Carefully examine cooler tubes for scale and
clean if necessary. If a cleaning solution is used,
be sure to wash out all chemicals thoroughly with
clean water before returning the compressor to
service. After cleaning, examine the cooler for
erosion or corrosion.
S
The internal cooler tubes can be cleaned by
several methods. Flushing a high velocity stream
of water through the tubes will remove many
forms of deposits. More severe deposits may
require running wire brushes or rods through the
tubes. Also, rubber plugs can be forced through
the tubes if a special air or water gun is available
for this procedure.
S
A qualified cleaning service should be used for the
cleaning process. These organizations can
evaluate the type of deposit to be removed and
supply the appropriate solution and method for a
complete cleaning job.
S
When reinstalling bonnets to cooler shell, tighten
bolts uniformly in a cross–pattern. Overtightening
can result in cracking of the bonnet.
S
Cleaning solutions must be compatible with the
metallurgy of the cooler
S
Care must be taken to avoid damaging tubes if
mechanical cleaning procedures are used.
Airend bearings
Airend bearings are lubricated by the compressor
coolant and require no maintenance.
High Airend Temperature Sensor checking
procedure
It is recommended that the discharge temperature
sensor (2ATT) is checked regularly as follows:
Aircooled machines
Stop the cooling blower by opening the blower
motor circuit breaker.
Watercooled machines
Shut off the cooling water.
The machine should trip at 109
_
C (228
_
F).
CAUTION
Under no circumstances should these discharge
temperatures be exceeded. If the machine fails to
trip A FAULT EXISTS. Investigate immediately.
Separator tank scavenge check valve/orifice
S
Disconnect tubing at each end of check
valve/screen/ orifice assembly.
S
Check orifice and clean if required. Use suitable
tool and remove orifice from its housing. Be careful
not to damage flared end of fitting or O–ring.Wash
housing in safety solvent and blow dry.
S
Press the check valve/orifice into fitting block.
S
Assemble the check valve/orifice assembly to the
tubing lines.The fitting must be re–installed with the
check valve on the upstream side of the orifice as
indicated by the flow arrow.
Motor Bearing Maintenance (Stored units)
S
Prior to placing a unit in storage for extended
intervals, rotate the blower motor several
revolutions by hand in the direction of rotation.
S
Thereafter rotate the motor as described above
every three months until such time as the unit is
placed in service.
S
If the storage time is to exceed a total of nine (9)
months duration, the compressor must be ordered
for long term storage.
Motor cowl cleaning
S
Ensure compressor is electrically isolated for at
least 15 minutes before commencing any
maintenance work.
S
Remove panels from the compressor.
S
Using a clean dry cloth, remove dust from the
surface of the motor cowl and ensure all
ventilation slots are free of obstructions.
S
Replace panels to the compressor.
Drive Box Filter Removal/Replacement
S
Ensure compressor is electrically isolated for at
least 15 minutes before commencing any
maintenance work.
S
Unclip the front grill of the drive box filter.
S
Remove the filter pad from the housing and
replace with a new filter pad from Ingersoll–Rand.
S
Replace front grill to the drive box filter.
Moisture Separator Check/Cleaning
S
Ensure compressor is electrically isolated for at
least 15 minutes, before commencing any
maintenance work.
S
Isolate the compressor from the system and fully
discharge the compressed air within the unit.
S
Remove plastic tube from the fitting located on the
bottom of the moisture separator.
S
Remove the bowl of the moisture trap, clean and
replace.
Condensate (Moisture) Drain Valve / Trap
S
Ensure compressor is electrically isolated for 15
minutes and all pressure is relieved from system.
S
Remove all pipes going to and from the valve (or
trap).