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7—ENG
DESCRIPTION OF OPERATION
to restart freely. When the motor stops running, air will be
heard escaping from the valve for a few seconds. No air
should be heard leaking when the motor is running.
Pressure Switch: The pressure switch automatically
starts the motor when the air tank pressure drops below the
factory set "cut-in" pressure. It stops the motor when the air
tank pressure reaches the factory set "cut-out" pressure.
Shut-off Valve: Turn the knob counterclockwise to open
the valve and clockwise to close.
Air Tank Safety Valve: If the pressure switch does not
shut off the air compressor at its cut-out pressure setting, the
safety valve will protect against high pressure by "popping
off" at its factory set pressure (slightly higher than the
pressure switch cut-out setting).
Aftercooler Safety Valve: On two stage compressor
units, safety valve is provided to prevent over-pressurization
of the aftercooler. The valve will protect the aftercooler by
"popping off" at its factory set pressure.
Regulator: An air pressure regulator or a separate air
transformer which combines the functions of air regulation
and/or moisture and dirt removal is recommended for most
applications.
Tank Pressure Gauge: The tank pressure gauge indi-
cates the reserve air pressure in the tank. On outfits with no
pressure regulator, this is also the pressure available at the
air outlet.
Drain Valve: At the base of the air tank to drain conden-
sation at the end of each use.
ON/AUTO-OFF Switch: Turn this switch ON to provide
automatic power to the pressure switch and OFF to remove
power.
Air Intake Filter: This filter is designed to clean air coming
into the pump. This filter must always be clean and ventilation
openings free from obstructions. See "Maintenance".
Air Compressor Pump: In two stage compressors, air is
first compressed to an intermediate pressure in the large bore
cylinder, and after passing through an inter-cooler, the air is
further compressed to a higher pressure in the smaller bore
cylinder. This process continues until the air tank pressure
reaches the factory set cutoff pressure. At that point the
pressure switch shuts the electric motor off.
Check Valve: When the air compressor is operating, the
check valve is "open", allowing compressed air to enter the
air tank. When the air compressor reaches "cut-out" pres-
sure, the check valve "closes", allowing air pressure to remain
inside the air tank.
Pressure Release Valve: The pressure release valve
located on the side of the pressure switch, is designed
to automatically release compressed air from the compressor
head and the outlet tube when the air compressor reaches
"cut-out" pressure or is shut off. If the air
is not released, the motor will try to start, but will be unable
to. The pressure release valve allows the motor