Description of Operation

Fig. 1

ON/AUTO-OFF Switch (A) Fig. 1: Turn

this switch ON to provide automatic

power to the pressure switch and OFF to

remove power.

Pressure Switch (B) Fig. 1: 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.

Air Tank Safety Valve (C) Fig. 1: 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).

Air Tank Pressure Gauge (D) Fig. 1: The air tank pressure gauge indicates the reserve air pressure in the air tank. On units with no pressure regulator, this is also the pressure available at the air outlet.

Air Intake Filter (not shown): 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 (not shown): To compress air, the pistons moves up and down in the cylinder. On the downstroke, air is drawn in through the air intake valves. The exhaust valve remains closed. On the upstroke of the piston, air is compressed. The intake valves close and compressed air is forced out through the exhaust valve, through the outlet tube, through the check valve and into the air tank. Working air is not available until the compressor has raised the air tank pressure above that required at the air outlet.

Drain Valve (not shown): Located at the base of the air tank to drain condensation.

Check Valve (not shown): 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" pressure, the check valve "closes", allowing air pressure to remain inside the air tank.

Pressure Release Valve (not shown): 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. The pressure release valve allows the motor 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.

Shut-off Valve (sold separately): Closes the air outlet (E, Fig. 1) allowing the tank to fill with air.

Regulator (sold separately): 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.

7-ENG