Ingersoll-Rand NIRVANA IRN75-160K-2S - Manual (Page 90)

IRN37 - 160K - CC & IRN50 - 200H -CC & IRN75 - 160K - 2S & IRN100 - 200H - 2S & IRN 250 - 300H - 2S
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10.0 MAINTENANCE
Remove 6 screws from top panel above cooler and
remove panel.
Using lifting device from above, attach lifting straps
to lifting supports on each side of cooler.
With the weight of the cooler supported by the
lifting device, remove the 10 screws securing the
cooler and remove the cooler.
Clean coolers with a mild cleaning solution.
WARNING
Strong cleaners can harm aluminium cooler parts.
Follow cleaner manufacturers instructions for use.
Wear appropriate safety equipment.
After cleaning is complete, reassemble in reverse
order.
N250/300H−TWO STAGE
COOLANT COOLERS
Following are instructions for removal and internal
cleaning of coolant coolers.
Remove panels and top cover.
Drain the coolant. See Section 4.6.
Remove side panels from coolant cooler box.
Disconnect piping from coolant cooler inlet and
outlet ports.
Plug cooler inlet and outlet ports to prevent possible
contamination.
Remove coolant cooler holding screws from sides of
coolant cooler and remove cooler through side of
cooler shroud.
It is recommended the cooler be taken to a
professional cooler service shop for flushing with an
appropriate environmentally safe cleaning agent.
Reassemble in reverse order.
Make sure fan guards are replaced.
Refill the compressor with coolant. If con tamination
is suspected, replace with new coolant.
Replace fill plug.
Run compressor for ten minutes. Check for possible
leaks. Check coolant level.
Replace enclosure panels.
WARNING
Strong cleaners can harm aluminum cooler parts.
Follow cleaner manufacturer‘s instructions for use.
Wear appropriate safety equipment.
AFTERCOOLER
Following are instructions for the removal and
internal cleaning of aftercoolers.
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Disconnect hose from aftercooler inlet flange.
Disconnect tube from aftercooler outlet flange.
Remove aftercooler holding screws from aftercooler
support and remove cooler.
It is recommended the cooler be taken to a
professional cooler service shop for flushing with an
appropriate environmentally safe cleaning agent.
Reassemble in reverse order.
Replace enclosure panels.
Watercooled Cooler Cleaning
A periodic inspection and maintenance program should
be implemented for watercooled heat exchangers. The
following steps should be taken:
Inspect filters in system and replace or clean as
required.
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.
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.
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.
When reinstalling bonnets to cooler shell, tighten
bolts uniformly in a cross−pattern. Overtightening
can result in cracking of the bonnet.
Cleaning solutions must be compatible with the
metallurgy of the cooler
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 / fan mo-
tor circuit breaker.
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