Craftsman 919.167800 Owner's Manual page 7

CFM: Cubic feet per minute.
SGFM: Standard cubic feet per minute; a unit of
measure of air delivery.
PSIG: Pounds per square inch gauge; a unit of
measure of pressure.
ASME: American Society of Mechanical Engineers;
made, tested, inspected and registered to meet the
standards of the ASME.
Cut-In Pressure: While the motor is off, air tank
pressure drops as you continue to use your acces-
sory.
When pressure drops to a certain low level
will restart automatically. The low pressure
at 1 the motor automatically re-starts is called
"cut-
i pressure."
Cut-O_ Pressure: When you turn on your air com-
presso iand it begins to run, air pressure in the air
tank be
sure be
tecting
capac_
off is
To Lo<
switch
gins to build, it builds to a certain high pres-"
fore the motor automatically shuts off - pro-
your air tank from pressure higher than its
y. The high pressure at which the motor shuts
died "cut-out pressure."
k Out Power: Place a lock on the line power
no no one else can turn on the power.
Drain Valve: At the base of the air tank to drain
condensation at the end of each u_e.
Motor Thermal Overload Protector: The electric
motor has an automatic thermal overload protector. If
the motor overheats for any reason, the thermal
overload protector will shut off the motor. The motor
must be allowed to cool down before restarting.
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: To compress air, the piston
moves up and down in the cylinder. On the down-
stroke, 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.
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" pressure, the check valve "closes", allowing
air pressure to remain inside the air tank.
located
to
COrn
comprel
If the air
will be
the mot_
runningi
few sec(
the mote
Pressur
starts th,
below th
motor w
set "cut-
Shut-off
i Release Valve: The pressure release valve
the side of the pressure switch, is designed
' release compressed air from the
sor head and the outlet tube when the air
isor reaches "cut-out" pressure or is shut off.
is not released, the motor will try to start, but
rlable to. The pressure release valve allows
r to restart freely. When the motor stops
air will be heard escaping from the valve for a
nds. No air should be heard leaking when
r is running.
Switch: The pressure switch automatically
i motor when the air tank pressure drops
factory set "cut-in" pressure, It stops the
_n the air tank pressure reaches the factory
_ut" pressure.
Valve: Turn the knob counterclockwise to
open the valve and clockwise to close.
Air Tanl_ Safety Valve: If the pressure switch does
not shut Joff t he air compressor at its cut-out pressure
setting, t_le safety valve will protect against high
pressure by "popping off" at its factory set pressure
(slightly I_igher than the pressure switch cut-out
setting)_
Aftercoctler Safety Valve: On two stage compressor
units, safety valve is provided to prevent over-pres-
surization1 of the aftercoole_; The valve will protect the
affercool_r by popping off at its factory set pressure.
Regulalx ur. An air pressure regulator or a separate air
transforn ler which combines the functions of air
regulatio 1and/or moisture and dirt removal is required
for most _pplications.
Tank Prl_$sure Gauge: The tank pressure gauge
indicate= the reserve air pressure in the tank. On
outfits w I_hno pressure regulator, this is also the
pressure available at the air outlet.
7qENG D20437 Rev. 0 2/15/00