DeVilbiss FLG4 Serie Manual De Servicio página 3

FLG4 GRAVITY FEED SPRAY GUN AND DeKUPS
IMPORTANT: Before using this
equipment, read all safety precautions
on page 2 and instructions. Keep for
future use.
H a l o g e n a t e d h y d r o c a r b o n
solvents - for example; 1, 1, 1-
trichloroethane and methylene
chloride - can chemically react
with the aluminum in this gun
and cause an explosion hazard.
Read the label or data sheet for the
material you intend to spray. Do
not use spray materials containing
these solvents with this spray gun.
IMPORTANT: This gun may be used with
most common coating and finishing
materials. It is designed for use with mildly
corrosive and non-abrasive materials.
If used with other high corrosive or
abrasive materials, it must be expected
that frequent and thorough cleaning will
be required and the necessity for replacement
of parts will be increased.
HVLP MODELS ONLY:
HVLP models of this gun were manufactured
to provide maximum transfer efficiency by
limiting air cap pressure to 10 psi (complies
with rules issued by SCAQMD and other air
quality authorities).
HVLP models of this gun will produce
approximately 10 psi cap pressure at 23 psi
gun inlet pressure, as measured at the gun
inlet. An air cap test kit (see Accessories)
should be used to ensure 10 psi cap pressure
is not exceeded.
The No. 3 (HVLP) air cap requires a 14 scfm
air supply at the gun inlet of 23 psi max.,
measured with the trigger pulled.
CONVENTIONAL MODELS ONLY:
The No. 1 air cap requires 10 scfm air supply
at a gun inlet of 40 psi, measured with the
trigger pulled.
SB-2-779-J (9/2017)
DISPOSABLE CUP SYSTEM
®
INSTALLATION
Note
Protective coating and rust
inhibitors have been used to keep
the gun in good condition prior to
shipment. Before using the gun,
flush it with solvents so that these
materials will be removed from
fluid passages.
For maximum transfer efficiency, do not
use more pressure than is necessary to
atomize the material being applied.
Connect the gun to a clean, moisture and oil
free air supply using a hose size of at least
5/16" I.D. hose. Do not use 1/4" I.D. hose.
(25' x 1/4" hose at 18 CFM has a pressure
loss of 25 psi. 25' x 5/16" hose at 18 CFM
has a pressure loss of 8 psi.)
Note
Depending on hose length, larger
I.D. hose may be required. Install
an HAV-501 air gauge at the gun
handle and air cap test kit over tip.
When gun is triggered on, adjust
regulated pressure to desired
setting to provide a maximum of
10 psi at the air cap. Do not use
more pressure than is necessary
to atomize the material being
applied. Excess pressure will
create additional overspray and
reduce transfer efficiency.
Note
If quick connects are required,
use only high flow quick connects
approved for HVLP use, such as
DeVilbiss HC-4419 and HC-4699.
Other types will not allow enough
air flow for proper gun operation.
Note
If an air adjusting valve is used
at the gun inlet, use DeVilbiss
Model HAV-500 or HAV-501. Some
competitive adjusting valves
have significant pressure drop
that can adversely affect spray
performance. Models HAV-500 and
HAV-501 have minimal pressure
drop, which is important for HVLP
spraying.
3 / 9
OPERATION
Mix, prepare and strain the material to
be sprayed according to the paint
maufacturer's instructions.
Strain material through a 60 or 90 mesh
screen.
PAINTING
Open the spreader adjustment valve (5) (Fan)
by turning the valve stem counterclockwise.
Close the fluid needle adjusting knob (6) by
turning clockwise.
Turn on air supply and set gun inlet
pressure; 23 psi for HVLP, 40 psi for
conventional use. Some materials can be
sprayed at lower pressures, improving
transfer efficiency.
Spray a test area. Turn the fluid needle
adjusting knob (6) counterclockwise until a
full coat is obtained.
If the finish is too sandy and dry, the
material flow may be too low for the
atomization air pressure being used.
Turn the fluid needle adjusting knob (6)
counterclockwise to increase fluid flow.
If the finish sags, there is too much material
flowing for the atomization air pressure
being used. Turn the fluid needle adjusting
knob (6) clockwise to decrease fluid flow.
Pattern width can be altered by turning
spreader adjustment valve (5), either
clockwise to decrease the width or
counterclockwise to increase the width.
Adjust inlet air pressure to provide a uniform
dispersion of atomized paint throughout
the pattern. Keep air pressure as low as
possible to minimize bounce-back and
overspray. Excessive pressure will result in
split spray patterns. Inadequate pressures
will cause heavy centered patterns and poor
atomization.
(continued on page 4)
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