Sears 919.17632 - Manual (Page 8)

Note
PRESSURE LOADS BEYOND DESIGN
LIMITS MAY CAUSE TANK RUPTURE OR
EXPLOSIOr;. PRESSURE SWITCH OPERA­
TION IS RELATED TO MOTOR HP. TANK
RATING AND SAFETY YALVE SETTING. DO
NOT ATTEr.lPT TO ADJUST, REMOVE, OR
DEFEAT
THE PRESSURE SWITCH. OR
CHANGE AND T/.ODIFY ANY PRESSURE
CONTROL RELATED DEVICE.
The pressure switch (19) starts the motor when the air
tank pressure drops below the factory set cut-in pres­
sure and stops the motor when the air tank pressure
reaches the factory set cut-off pressure. (See specifica­
tion chart, page 5.)
Safety Valve
OVER-PRESSURIZATION OF THE AIR TANK
MAY CAUSE TANK RUPTURE OR EXPLO­
SION.
THE OUTFIT IS PROTECTED FROM
THE OVER-PRESSURIZATION BY A
SAFETY VALVE. DO NOT ELIMINATE, MAKE
ADJUSTMENTS
OR SUBSTITUTIONS TO
THIS DEVICE.
ON-AUTO/OFF
SVWTCH
TANK PRESSURE
. GAUOE
AlROUn^
JREGAUGE
I!
AIR OUTLET
Figure Z
I The pressure switch (19) is pre-set to shut off the motor
aptomatically at the maximum operating pressure. If the
presaire swfltch does not shut oft the outfit at its cut-off
pressure setting, the safety valve vwll protect against
high pressure popping at its pre-set pressure.
motor has a thermal overload protector. If the motor
overheats for any reason, the overload protector will
put off the motor. The motor must be allovred to cool
before restarting. Turn the ON-AUTO/OFF switch to the
ÓFF position. Depress the reset button located on the
#nd of the motor. To restart, turn the ON-AUTO/OFF
itch to the ON position. Refer to Rgure i.
a
If the overload protector shuts the motor off fre­
quently, check for a possible voltage problem.
Low voltage can also be suspected when:
1. The motor does not get up to full power or
speed.
2. Fuses blow out when starting the motor.
3. Lights dim and remain dim when motor is
started.
Note
; Avoid using long extension cords. They can
cause a power loss to the motor. Add extra air
hose instead of extension cords.
If an extension cord must be used:
- use only a 3-wire extension cord that has a 3-blade
grounding plug, and a 3-slot receptacle that will accept
the plug on the ti^ducf.
- make sure the cord is in good condition.
- the cord should be no ion^r than 50 feet.
- the minimum wire size is 12 gauge (AWG). (Wire size
increases as gauge number decreases. 10 AWG and
8 AWG may also be used. Do not use 14 AWG or 16
AWG.) ■
Pressure Release Valve
The pressure release valve located on the side of the
pressure switch is designed to unload air from the com­
pressor head automatically at unit shut off. Ibis pnitects
the motor from starting against air pressure remaining in
the compressor head and tubing. When the motor stops
running, air will be heard escaping from the valve for a
few seconds. When the motor is running, no air should
be leaking from the pressure release valve.
MAINTENANCE
Replacing Air intake Filter
A dirty air intake filter will not allow the compressor to
operate at full capacity. When the intake filter becomes
dirty, oily, or covered with paint overspray, replace it. Do
not Operate the compressor with the air intake filter
removed. To replace the filter, use needle nosed pliers
and pull or pry the old filter out. Replace with new. Refer
to Figure 1.
Checking Safety Valve
WARNING
OVER-PRESSURIZATION CAUSING TANK
RUPTURE OR EXPLOSION MAY OCCUR F
THE SAFETY VALVE DOES NOT WORK
PROPERLY. OCCASIONALLY PULL THE
RING ON T he SAFETY VALVE TO MAKE
SURE THAT THE VALVE OPERATES
FREELY. IF THE VALVE IS STUCK OR DOES
NOT
OPERATE SMOOTHLY. IT MUST BE
REPLACED.