Ingersoll Rand Refrigarated Air Dryer DXR75

Air-cooled condensers maintenance

Remove dust, dirt or other particles with a soft brush or with compressed air from an OSHA-approved air nozzle that limits its discharge pressure to 30 psig

If the coils are coated with oil, grease or other substances that reduce the cooling efficiency, clean the coil

Sign off on the monthly dryer maintenance

Prefilter differential pressure gauge checked

Filter element replaced when pointer reaches red zone of gauge (approx. 7 to 10 psid)

Failure to change element at least once a year or when the gauge reaches the red zone will adversely affect dryer performance.

Internal float drain valve on the prefilter inspected every two to three weeks for excessive oil and water

Test valve on the bottom of the filter unit pressed

More than one or two drops of oil leaked out?

If more than one or two drops of oil leak out, the drain valve should be cleaned or replaced as required.

Sign off on the weekly dryer maintenance

Warning: Vent internal pressure to atmospheric pressure before performing any maintenance.

Inspect the internal float drain valve on the prefilter for excessive oil and water by pressing the test valve on the bottom of the filter. If more than one or two drops of oil leak out, the drain valve should be cleaned or replaced as required.

Isolate the filter by opening the bypass valve and closing both isolation valves.

Open the pressure bleed valve to vent the filter to atmospheric pressure.

Disconnect drain lines and automatic drain valves (if installed).

Warning: A 'hissing' sound while the bowl is being removed indicates the filter has not been properly depressurized. DO NOT continue to remove the bowl until the filter has been completely vented to atmospheric pressure.

Remove the bottom bowl by unscrewing it from the head. A strap wrench may be needed.

Remove the nut from the bottom of the bowl.

Turn the bowl upside down. The float drain will fall out.

DANGER! Vent internal pressure to atmospheric pressure before performing any maintenance.

Isolate the filter by opening the bypass valve, and closing both isolation valves.

Open the pressure bleed valve to vent the filter to atmospheric pressure.

Disconnect drain lines at manual and automatic drain valves (if installed).

DANGER! A 'hissing' sound while the bowl is being removed indicates the filter has not been properly depressurized. DO NOT continue to remove the bowl until the filter has been completely vented to atmospheric pressure.

Remove the bottom bowl by unscrewing it from the head. A strap wrench may be needed.

Remove the element from the filter head with a brisk downward pull, or by working the element back and forth until it snaps free. Discard the element in accordance with applicable regulations.

Clean accumulated debris from the bowl with soap and water, and dry thoroughly.

CAUTION! Lubricate the element O-ring with a petroleum-based lubricant that is compatible with your application.

DANGER: Dismantling or working on any component of the compressed air system under pressure may cause equipment failure and serious personal injury. Before dismantling any part of the dryer or compressed air system, completely vent the internal pressure to the atmosphere.

For continued good performance of your refrigerated dryer, all refrigeration system maintenance should be performed by a competent refrigeration mechanic.

Before corrective maintenance is done during the warranty period, call your local distributor and proceed according to instructions. Refer to the warranty for limits of your coverage.

Check the operation of the automatic drain valve at least once during each 8-hour shift.

On models 75 to 100 scfm, inspect and clean (if necessary) the drain valve strainer. See the Field Service Guide for remedies to drain valve malfunctions. See the Instrumentation section for drain valve adjustment.

For models with the System Operation Monitor, check the following readouts.

Refrigerant suction temperature

Refrigerant discharge temperature