Ingersoll-Rand 100-200 HP/75-160 KW General System Information, Coolant Cooler, Cooling FAN Motor

5.0SYSTEMS

5.1GENERAL SYSTEM INFORMATION

The SSR 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.

A standard compressor is composed of the following:

■Inlet air filtration

■Compressor and motor assembly

■Pressurized coolant system with cooler

■Separation system

■Capacity control system with stepper motor inlet

■Motor starting control system

■Instrumentation

■Safety provisions

■Aftercooler

■Moisture separator and drain trap.

Optional accessories can provide for such things as automatic starting and stopping, remote starting or stopping, and sequencer.

The motor, airend, separator tank, and piping are mounted on independent supports. The supports are isolated from the base by rubber isolation mounts. Flexible hoses are utilized on the separator tank coolant out and air discharge to isolate the motor/airend/tank.

5.2 AIR COOLED COMPRESSORS

DESIGN TEMPERATURES

The standard compressor is designed for operation in an ambient range of 35°F to 115°F (1.7°C to 46°C). When conditions other than the design levels described are encountered, we recommend you contact your nearest Ingersoll-Rand representative for additional information.

The standard maximum temperature 115°F (46°C) is applicable up to an elevation of 3300 ft (1000 m) above sea level. Above this altitude, significant reductions in ambient temperature are required if a standard drive motor is to be used.

COOLANT COOLER

The cooler is an integral assembly of core, fan and fan-motor, all mounted in the end section of the compressor enclosure. The cooling air flows in through the left end of the enclosure, through the vertically mounted cooler core, and discharges upward through the right end of the enclosure.

COOLING FAN MOTOR

In a standard compressor, the cooling fan motor is wired at the factory. It is a three-phase motor, protected by a suitable circuit breaker and overload relay. The fan motor is energized at the same time the compressor drive motor is energized. The fan motor overload is wired in series with the compressor drive motor overload. If an overload occurs in the fan motor circuit, both the fan motor and compressor drive motor will stop.

AFTERCOOLER

The discharge air aftercooling system consists of a heat exchanger (located at the cooling air entrance of the machine), a condensate separator, and an automatic drain trap.

By cooling the discharge air, much of the water vapor naturally contained in the air is condensed and eliminated from the downstream plant-piping and equipment.

5.3 COOLANT SYSTEM

Coolant is forced by pressure from the receiver/separator sump to the inlet port of the coolant cooler and the bypass port of the thermostatic control valve.

The thermostatic control valve controls the quantity of coolant necessary to provide a suitable compressor injection temperature. When the compressor starts cold, part of the coolant will bypass the cooler. As the system temperature rises above the valve setting, the coolant will be directed to the cooler. During periods of operation in higher ambient temperatures, all the coolant flow will be directed through the cooler.

The compressor injection minimum temperature is controlled to preclude the possibility of water vapor condensing in the receiver. By injecting coolant at a sufficiently high temperature, temperature of the discharge air and lubricant mixture will be kept above the dew point.

The controlled temperature coolant passes through a filter to the airend under constant pressure.

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