Sears 919.18416 - Manual (Page 6)

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 isusually necessary formost of these applica­
tions. Regulators can be purchased from most Sears
stores orthrough the current Sears Power and Hand Tool
Catalog,
Separate airtransformers 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 com pressor. A1 /2" N PT 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 u p and down inthecylinders.Onthe 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: Wh en the air compressor is operating, the
check valve is "open," allowing compressed airto enter
theairtank.Whentheaircom pressor 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 beunableto.
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-i n" pressure. It stops 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 airfrom
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
motorto restart freely. When the motor stops running, air
will be heard escaping fora few seconds. No air should
be heard leaking when the motor is running.
Safety Valve: If the pressure switch does not shut off the
air compressor at or near its cut-out pressure sett! ng, the
safety valve will protect against high pressure by "p>op-
ping out" at its factory set pressure (slightly higher 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 airthrough 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