Ingersoll-Rand 80445364 manual Operating Instructions, General Operation, LOW Demand Applications

28 OPERATING INSTRUCTIONS

GENERAL OPERATION

The compressor is an electric motor driven, single stage screw compressor, complete with accessories piped, wired and baseplate mounted. It is a totally self contained air compressor package.

The standard compressor is designed to operate in an ambient range of 35.6_F − 104_F (2_C to 40_C). The maximum temperature is applicable up to a maximum elevation of 3280ft (1000m) above sea level. Above this altitude significant reduction in maximum allowable ambient temperature is required.

Compression in the screw type air compressor is created by the meshing of two (male & female) helical rotors.

The air/coolant mixture discharges from the compressor into the separation system. This system removes all but a few PPM of the coolant from the discharge air. The coolant is returned to the cooling system and the air passes through the aftercooler and out of the compressor.

Cooling air is moved through the coolers by the cooling fan and discharged from the machine.

WARNING

This unit is equipped with automatic cooling fan control. The package − cooling fan will operate independently of the compression module. The fan may operate when the compressor is stopped in automatic restart mode or when the on−off selector switch is in the ’off’ position with the e−stop disengaged.

CAUTION

Cooling air is drawn in at the rear of the machine package passing through the filter and cooler before being discharged from the top of the machine. Care should be taken to avoid blocking the airflow, or causing any restriction in excess of the maximum backpressure allowed for ducting.

Do not direct the airflow at face or eyes.

The power transmission from the drive motor to the airend male rotor is by direct drive.

By cooling the discharge air, much of the water vapour naturally contained in the air is condensed and may be drained from the downstream piping and equipment.

The coolant system consists of a sump, cooler, thermostatic valve and a filter. When the unit is operating, the coolant is pressurized and forced to the compressor bearings.

The compressor load control system is automatic stop and restart, with selectable variable speed control. This allows the compressor to maintain a set discharge line pressure by varying output capacity to match the system demand. The unit is provided with an automatic stop and restart system for use in plants where the air demand varies sufficiently to allow a compressor to shut down and save power. Significant system volume will assist this and is recommended.

WARNING

When the unit stops running as the result of low air demand, it may restart and return to load at any time.

CAUTION

LOW DEMAND APPLICATIONS

During periods of low demand, the compressor may not reach its normal operating temperature. Sustained operation at low demand can result in the build up of condensate in the coolant. If this situation occurs, the lubricating characteristics of the coolant can be impaired which may lead to damage of the compressor.

THE COMPRESSOR SHOULD BE ALLOWED AMPLE LOADED RUNNING TIME.

Safety of operation is provided as the compressor will shut down if excessive temperatures or electrical overload conditions should occur.

CAUTION

This unit is not designed or intended to operate when contaminated with silicone. Lubricants, greases or other items containing silicone should not be used on this unit.

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