14
equipped. Push the Start button to start the unit and
immediately depress (push) the Stop button to stop the
unit.
Observe the compressor drive motor shaft. The rota-
tion should be in accordance with the directional arrow
decal on the motor.
Should the motor rotation not be correct, put the main
disconnect in the OFF position, lock and tag.
Interchange any two line connections (L1 ,L2, or L3) at
the starter. Close the control box cover. Recheck for
correct rotation.
2.8 BEFORE STARTING - STARTING - STOPPING
Read and understand the following instructions
before operating or performing any maintenance
on this unit.
Before Starting:
1. Ensure that Stop push button is in the OFF
(depressed) position (See Figure 2.8-1).
2. Check coolant level.To check coolant level, slowly
loosen the fill plug one complete turn. As the fill plug is
unscrewed approximately one turn, a small amount of
pressure may be released. Do not remove the fill plug
until all pressure has been vented. Once pressure is
vented, finish removing the fill plug.The proper coolant
level is when the coolant is even with the top of the fill
port. Add coolant if necessary.
3. Replace and tighten fill plug.
4. Close the main disconnect switch (ON position).
5.Verify that the main isolation valve is open.
FIGURE 2.8-1 CONTROL BOX
CONTROL
BOX
START
BUTTON
STOP
BUTTON
HOUR
METER
PRESSURE
GAUGE
POWER ON
LIGHT
AUTO RESTART
LIGHT
Starting
1. Push the Start button and release.The compressor
will start and then load automatically if line pressure is
below the lower set point of the pressure switch.
Stopping
1. Depress the Stop button to the OFF position.
Compressor will stop immediately.
2. Open the main disconnect switch (OFF position).
3.0 SYSTEMS
3.1 GENERAL SYSTEM INFORMATION
The compressor is an electric motor driven, single
stage, rotary screw compressor, complete with sup-
porting components to make a fully functional unit. A
standard compressor is composed of the following:
Inlet air filter
Drive motor
Airend
Pressurized coolant system with cooler & filter
Separation system
Capacity control
Instruments
Safety devices
Compression in the rotary screw type air compressor
is created by the meshing of two helical rotors (male
and female) on parallel shafts, enclosed in a heavy
duty iron housing, with air inlet and outlet ports located
on opposite ends.The grooves of the female rotor
mesh with and are driven by the male rotor. Bearings
on both ends of the rotors are used to support the
rotor both laterally and axially.
3.2 COOLANT SYSTEM
The coolant system consists of a separator tank, ther-
mostatic element, coolant filter, coolant cooler with
fans, and a separator element.When the unit is operat-
ing, the coolant is pressurized and forced to the com-
pressor bearings.The compressor is provided with a
temperature switch which will shut the unit down in
case of excessive temperature, 228°F (109°C).
Effective coolant filtration is provided by the use of a
screw on, automotive type, heavy duty coolant filter.
The compressor is designed for operation in an ambi-
ent range of 35°F to 115°F (2°C to 46°C).The stan-
dard maximum temperature 115°F (46°) is applicable
up to an elevation of 3300 ft. (1000 m).
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