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Speedaire Operating Instructions and Parts Manual
Model 4UP73
Installation (Continued)
Risk of electrical
shock. If repairing
or replacing cord or plug, the
grounding wire must be kept
separate from the current-carrying
wires. Never connect the grounding
wire to a flat blade plug terminal.
(The grounding wire has insulation
with an outer surface that is green
with or without yellow stripes.)
White
Wire
Ground
Outlet
15 AMP Plug
Grounded
Outlet
Grounding
Pin
Figure 2
BREAK-IN PROCEDURES
This procedure is only required the first
time the air compressor is put into service
and when the check valve has to be
replaced.
1. Set the pressure switch OFF/AUTO
lever to the OFF position.
2. Plug power cord into the correct
branch circuit receptacle.
3. Turn regulator clockwise, opening it
fully, to prevent air pressure build-up
in the tank.
4. Move the OFF/AUTO lever to
AUTO. Compressor will start.
5. Run the compressor for 15 minutes.
Make sure the regulator is open and
there is no tank pressure buildup.
6. After 15 minutes, close the regulator
by turning it counter-clockwise. Air
tank will fill to cut-out pressure and
then the motor will stop.
Operation
P re ssu re
R elief Valv e
(N o t Sh o w n )
P re ss u re
Sw itc h
O n /O ff
Le v e r
R eg u la to r
P re ssu re
G a u g e
Ta n k
P re ss u re
G a u g e
S a fety
Va lv e
C h eck Valv e
D rain Va lv e
Figure 3
AIR COMPRESSOR PUMP
To compress air, the pistons move up and
down in the cylinder. Air is drawn in
through the air intake valves on the
downstroke of the pistons. Exhaust valve
remains closed. On the upstroke of the
pistons, air is forced out through the
exhaust valve, through the outlet tubes,
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.
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.
PRESSURE RELEASE VALVE
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.
5
Motor will not be able to start if the air
is not released. The pressure release
valve allows the motor to restart freely.
A ir
After the motor stops running air will
C o m p res so r
escape from the pressure release valve.
P u m p
No air should be heard leaking when
the motor is running.
PRESSURE SWITCH
The pressure switch automatically starts
the motor when the air tank pressure
drops below the factory set "cut-in"
pressure. When the air tank pressure
reaches the factory set "cut-out"
pressure the pressure switch
automatically stops the motor.
SAFETY VALVE
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 preset pressure.
REGULATOR
Air pressure coming from the air tank is
controlled by the regulator knob. Turn
the knob clockwise to increase pressure
and counter-clockwise to decrease
pressure. To avoid minor readjustments
after making a change in pressure
setting, always approach the desired
pressure from a lower pressure. When
reducing from a higher to a lower
setting, first reduce to a pressure lower
than is desired, then raise the pressure
to the desired setting. The outlet
regulated air pressure may need to be
adjusted while operating, depending on
the air requirements of the accessory.
OUTLET PRESSURE GAUGE
The outlet pressure gauge indicates the
air pressure available at the outlet side
of the regulator. Pressure is controlled
by the regulator and is always equal to
or less than the tank pressure. See
"Operating Procedures."
TANK PRESSURE GAUGE
The reserve air pressure in the tank is
indicated by the tank pressure gauge.
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