Ingersoll-Rand EP 60, Operators/Instruction Manual Options

Page: 24 / 62

Cooling Fan Motor
In a standard compressor, the cooling fan motors
are wired at the factory. They are three-phase-
motors. Each is protected by a fan motor
starter/overload. The fan motor is energized at the
same time the compressor drive motor is energized.
The fan motor starter/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 discharge
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.
4.3 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.
22
4.0 SYSTEMS
4.1 GENERAL 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
Motor starting control system
Instrumentation
Safety provisions
Aftercooler
Moisture separator and drain trap
Optional accessories can provide for such things as
remote starting or stopping and sequencer.
4.2 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 design levels
described are encountered, we recommend you
contact your nearest Ingersoll-Rand representative
for additional information.
The standard maximum temperature (115°F.) is
applicable up to an elevation of 3300 ft. (1000
meters) 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, mounted in the compressor. The cooling
air flows in through the left side of the enclosure,
through the vertically mounted cooler core, and
discharges upward through the top of the enclosure.