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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 a pplica-
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 air corn 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
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