DeVilbiss SRI PRO series Technical Bulletin page 8

Page 8 SB-2-855-B
INSTALLATION
For maximum transfer efficiency,
do not use more pressure than is
necessary to atomize the material
being applied . NOTE: when using the
HS1, HVLP setup do not exceed 29.0
psi (2 bar) inlet pressure. This will
insure HVLP compliance by limiting
air cap pressure to 10 psi (0.7 bar).
1 . Connect the gun to a clean,
moisture and oil free air supply
using a conductive hose .
NOTE
Install an air gauge at the
gun handle . When
is triggered on,
regulated pressure to 29 .0
psi (2 .0 bar) . Do not use
more pressure than
necessary to atomize the
material being
Excess pressure will create
additional overspray
reduce transfer efficiency .
NOTE
If an air adjusting valve
is used at the gun inlet,
use DeVilbiss model HAV-
512 . Some competitive
adjusting valves
significant pressure
that can adversely affect
spray performance .
DeVilbiss model HAV-512
has minimal pressure drop,
which is important for HVLP
spraying .
2 . Attach the gravity feed cup to the
material inlet .
NOTE
Before using the gun, flush
it with solvent to ensure that
the fluid passages are clean .
OPERATION
1 . Mix coating material
manufacturer's instructions .
2 . Strain the material .
3 . Fill the cup to no more than 1/2
inch from the top of the cup . DO
NOT OVERFILL .
4 . Attach Cup Lid . Make sure that the
cup lid vent hole is clear .
5 . Turn fluid adjusting knob (18)
clockwise to prevent fluid needle
movement .
6 . Turn spreader valve adjusting knob
(23) counter clockwise to fully
open .
7 . Adjust inlet air pressure to 29 .0 psi
(2 .0 bar) .
8 . Turn fluid adjusting knob counter
clockwise until first thread shows .
9 . Test spray . If the finish is too dry,
reduce airflow by reducing air inlet
pressure .
10 . If finish is too wet, reduce fluid
gun
adjust flow by turning fluid adjusting
knob (18) clockwise . If atomization
is too coarse, increase inlet air
is pressure . If too fine, reduce inlet
pressure .
applied .
11 . The pattern size can be reduced
by turning spreader valve knob
and
(23) clockwise .
12 . Hold gun perpendicular to surface
being sprayed . Arcing or tilting
may result in uneven coating .
13 . The recommended spray distance
is 3-6 in (75-150 mm) .
14 . Spray edges first . Overlap each
have
stroke a minimum of 75% . Move
drop
gun at a constant speed .
15 . Always turn off air supply and
The
relieve pressure when gun is not
in use .
PREVENTIVE MAINTENANCE
& CLEANING
To clean air cap and fluid nozzle,
brush exterior with a stiff bristle
brush . If necessary to clean cap holes,
use a broom straw or toothpick if
possible . If a wire or hard instrument
is used, extreme care must be used
to prevent scratching or burring of
the holes which will cause a distorted
spray pattern .
to
To clean fluid passages, remove
excess material from cup, then flush
with gun wash solution . Wipe the
gun exterior with a dampened cloth .
Never completely immerse in any
solvent or cleaning solutions as this
is detrimental to the lubricants and
life of the spray gun .
NOTE
When replacing the fluid
nozzle or fluid
replace both at the same
time . Using worn
can cause fluid leakage .
See page 13, Chart 2 . Also,
replace the needle packing
at this time . Torque the fluid
nozzle to 80-90 in-lbs (9-10
Nm) . Do not over tighten .
CAUTION
To prevent damage to fluid
nozzle (8) or fluid needle
(15), be sure to either 1) pull
the trigger and hold while
tightening or loosening the
fluid nozzle, or 2) remove
fluid adjusting knob (18)
to relieve spring pressure
against needle collar.
SPRAY GUN LUBRICATION
Daily, apply a drop of SSL-10 spray
gun lube at trigger bearing stud (39)
and the stem of the air valve (32) . The
shank of the fluid needle (15) where
it enters the packing nut (28) should
also be oiled . Make sure the retaining
ring (1) threads are clean and free of
foreign matter . Before assembling
retaining ring to spray gun, clean
the threads thoroughly, then add two
drops of SSL-10 spray gun lube to
threads . The fluid needle spring (16)
should be coated with a very light
grease . For best results, lubricate the
points indicated, daily .
A . Trigger Points
B . Packing
C . Adjusting Valves
D . Gun/Air Cap Threads
E . Air Valve Cartridge
A
A
D
needle,
parts
C
E
B