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Westward Operating Instructions and Parts Manual Model 3JR70A
Portable Air Compressor
EXTENSION CORDS
Use extra air hose instead of an
extension cord to avoid voltage drop
and power loss to the motor, and to
prevent overheating.
If an extension cord must be used, be
sure it is:
• a 3-wire extension cord that has
a 3-blade grounding plug, and a
3-slot receptacle that will accept
the plug on the product
• in good condition
• no longer than 50 feet
• 12 gauge (AWG) or larger. (Wire
size increases as gauge number
decreases. 10 AWG and 8 AWG
may also be used. DO NOT USE
14 OR 16 AWG.)
VOLTAGE AND CIRCUIT
PROTECTION
Refer to the specifications for the
voltage and minimum branch circuit
requirements.
Certain air compressors can be
operated on a 15 amp circuit if the
following conditions are met.
1. Voltage supply through branch
circuit is 15 amps.
2. Circuit is not used to supply any
other electrical needs (lights,
appliances, etc.).
3. Extension cords comply with
specifications.
4. Circuit is equipped with a 15 amp
circuit breaker or 15 amp time
delay fuse. NOTE: If compressor
is connected to a circuit protected
by fuses, use only time delay
fuses. Time delay fuses should
be marked "D" in Canada and "T"
in the US.
If any of the above conditions
cannot be met, or if operation of
the compressor repeatedly causes
interruption of the power, it may be
necessary to operate it from a 20 amp
circuit. It is not necessary to change
the cord set.
Operation
KNOW YOUR AIR COMPRESSOR
READ THIS OWNER’S MANUAL
AND SAFETY RULES BEFORE
OPERATING YOUR UNIT. Compare
the illustrations with your unit to
familiarize yourself with the location
of various controls and adjustments.
Save this manual for future reference.
DESCRIPTION OF OPERATION
Become familiar with these controls
before operating the unit.
On/Auto/Off Switch: Turn this switch
ON to provide automatic power to the
pressure switch and OFF to remove
power at the end of each use.
Pressure Switch: The pressure
switch automatically starts the
motor when the air tank pressure
drops below the factory set "cut-in"
pressure. It stops the motor when the
air tank pressure reaches the factory
set "cut-out" pressure.
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 out" at its
factory set pressure (slightly higher
than the pressure switch "cut-out"
setting).