Figure 2-2. Air compressor drive motor controls, air receiver tank pressure gage and pressure switch
The service light switch (fig
reset switch will automatically disengage when a
l. Service Light Switch.
on the upper rear
of the control
mechanical or electrical malfunction occurs in the air
system that causes the electrical circuit to be over-
m. Air Pressure Gage. The gage (fig 2-2) shows the
amount of air pressure in the air receiver tank. During
q. External Power Receptacle. The external power
normal operation it should read between 80 psi and 100
receptacle (fig 2-3) provides 115 volts ac single-phase
power to operate equipment.
n. Pressure Switch The switch (fig 2-2) is a pressure
r. Overspeed Safety Switch. The overspeed safety
operated electric switch that automatically starts and
switch (fig 2-4) will break the ignition circuit at 2140
stops the air compressor to maintain a minimum of 80
rpm or 68 hertz. To reset the overspeed safety switch,
psi and a maximum of 100 psi.
shut ignition switch off and restart engine.
o.Pop-off Value. The pop-off valve (fig 2-2) is a
s. High Temperature Safety Switch. As a safety pre-
safety device to protect the air system and personnel if
caution against overheating, a high temperature safety
a malfunction occurs that would cause the pressure in
switch has been mounted to the cylinder head at no. 2
the system to exceed a safe working pressure. The pop-
spark plug. The safety switch will automatically stop
off valve will open to let the air pressure escape from
the engine by shorting out the ignition system. A wait-
the system when the air pressure of 135 psi is reached.
ing period of about 15 minutes will be required before
p. Start, Stop and Reset Switch. The switch (fig 2-2)
the switch has cooled off sufficiently to restart the
is used to start and stop the air compressor system. The