Sears 919.18416 General Information, Description of Operation, Location of the Air Compressor

GENERAL INFORMATION

You have purchased an air compressor unit consisting of a two cylinder, single stage air compressor pump, an ASME air tank, associated controls and instruments. This air compressor must be permanently mounted in place.

Your air compressor can be used for operating paint spray guns, air tools, caulking guns, grease guns, air brushes, sandblasters, inflating tires and plastic toys,

spraying weed killers, insecticides, etc. An air pressure regulator is usu ally necessary for most of these applica- tions. Regulators can be purchased from most Sears stores or through the current Sears Power and Hand Tool Catalog.

Separate air transformers which combine the functions of air regulation and/or moisture and dirt removal should be used where applicable.

Some form of piping or shut-off valve must be installed before operating the aircorn pressor. A 1/2" NPT shut-off

globe valve should be installed at the air compressor tank. Do not use a ball valve.

DESCRIPTION OF OPERATION

Air Compressor Pump: To compress air, the pistons move up and down in the cylinders. On the downstroke, air is drawn in through the air intake filter and then through the air intake valves. The exhaust valve remains closed. On the upstroke of the piston, air is com- pressed. The intake valves close and compressed air is forced out through the exhaust valves, through the outlet tube, through the check valve and into the air tank. Working air is not available until the compressor has

raised air tank pressure above that required at the air outlet.

Check Valve: When the air corn pressor is operating, the check valve is "open," allowing compressed air to enter the airtank. When the air compressor reaches "cut-out" pressure, the check valve "closes," allowing air pres- sure to remain inside the air tank. If the air is not unloaded, the motor will try to start, but will be unable to. The check valve allows the motor to re-start freely.

Pressure Switch: The pressure switch automatically starts

the motor when the air tank pressure drops below the factory set "cut-in"pressure. Itstops the motor when the air tank pressure reaches the factory set "cut-out" pressure.

Pressure Release Valve: The pressure release valve is designed to automatically release compressed air from the compressor head and the outlet tube when the air compressor reaches "cut-out"pressure or isshut off. If tt_e air is not released, the motor will try to start but will be unable to. The pressure release valve allows the motorto restart freely. When the motor stops running, air will be heard escaping for a few seconds. No air should be heard leaking when the motor is running.

Safety Valve: Ifthe pressure switch does not shut offthe air compressor at or near itscut-out pressure setting, the safety valve will protect against high pressure by "pop- ping out" at itsfactory set pressure (slightlyhigher than the pressure switch cut-out setting).

INSTALLATION AND BREAK-IN PROCEDURES

Location of the Air Compressor

Operate the air compressor in a clean, dry and well ventilated area. The air intake filter must be kept clear of obstructions which could reduce air delivery of the air compressor. The air compressor should be located at least 12" away from walls or other obstructions that could interfere with the flow of air th rough the fan bladed flywheel. The air compressor crankcase and head are

designed with fins to provide proper cooling. If the

humidity is high, a Sears air filter can be installed to remove excessive moisture.

The air compressor should be as near to air outlets as possible in order to avoid long pipe lines. Do not place the air compressor where heat is excessive.

6 -- Eng