Unloader Valve; Safety Valve - DeWalt D55394 Instruction Manual

WARNING: RISk Of INjURy fROm lIfTING
WHAt CAn HAPPEn
• Serious injury can result from
attempting to lift too heavy
an object.
CAUTION: RISk fROm NOISE
WHAt CAn HAPPEn
• Under some conditions and
duration of use, noise from
this product may contribute
to hearing loss.
SAvE THESE InSTruCTIonS
For FuTurE uSE
FEATurES (Fig. 1)
DuAl Control
Dual control allows the compressor to operate in the constant
run or the stop/start mode of operation. The unloader valve (H)
is used to control the compressor when operating in the constant
run mode. The pressure switch is used to control the compressor
when operating in the stop/start mode. The mode of operation is
determined by the amount of time the compressor will be required to
HoW to PrEVEnt It
• The compressor is too heavy
to be lifted by one person.
Obtain assistance from others
before lifting.
HoW to PrEVEnt It
• Always wear certified safety
equipment: ANSI S12.6
(S3.19) hearing protection.
supply air. If the demand for air is infrequent, then the unit should be
operated in the stop/start mode to minimize unnecessary run time
and to save energy. If there is a frequent or extended demand for
air, and/or the unit is located in a remote area where access to the
compressor is difficult, the unit should be operated in the constant
run mode to minimize the number of times the motor must start in
an hour to ensure good motor life.

unloADEr VAlVE

When the maximum air tank pressure is
obtained, the unloader valve (H) will blow-off.
This will cause the compressor to exhaust the
air to the atmosphere and not the tank. The
valve is preset by the manu facturer and must not
be removed or modified in any way.
PrEssurE sWItCH
The pressure switch (M) 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. The pressure release valve located on the side of the pres-
sure 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. The pressure release valve
allows the motor to restart freely. When the motor stops running, air will
be heard escaping from this valve for a few seconds. No air should be
heard leaking when the motor is running.

sAfEty VAlVE

This valve (I) is designed to prevent system
failures by relieving pressure from the system
when the compressed air reaches a predeter-
mined level. The valve is preset by the manu-
facturer and must not be removed or modified in
any way.
9
H
I