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OPERATING INSTRUCTIONS
28
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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