DeVilbiss GTI-600G Installation Manual

GTI-600G AND GTI-620G COMPLIANT HIGH VOLUME LOW PRESSURE
IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.
DESCRIPTION
The complaint high volume low pressure
gravity feed GTI guns are designed to apply
a wide variety of finishing materials.
These guns were manufactured to provide
a maximum transfer efficiency by limiting
air cap pressure to 10 psi (complies with
rules issued by SCAQMD and other air qual-
ity authorities).
These guns will produce approximately 10
psi air cap pressure at 30 psi gun inlet
pressure. Air cap test kits are available
(see Accessories) which can be utilized to
set the exact air cap presssure. Air con-
sumption for the GTI-600G (#100 cap) is
16 SCFM at 10 psi air cap pressure. Air
consumption for the GTI-620G (#2000
cap) is 15 SCFM at 10 psi air cap presssure.
NOTE
This gun includes 400 series stain-
less steel fluid tip and needle.
Guns may be used with chlori-
nated solvent materials only if the
attached gravity cup is Delrin or
Nylon. Do not use aluminum cups
with chlorinated solvent materi-
als.
NOTE
The GFC gravity feed cups are
only included with the gun as part
of the refinishers kit and must be
ordered separately. See ACCES-
SORIES on Page 6 for more infor-
mation.
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 thor-
ough cleaning will be required and the ne-
cessity for replacement of parts will be
increased.
GRAVITY FEED SPRAY GUNS
INSTALLATION
For maximum transfer efficiency, do not
use more pressure than is necessary to
atomize the material being applied.
1 . 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 pro-
vide 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 re-
duce transfer efficiency.
NOTE
If quick connects are required, use
only high flow quick connects ap-
proved for HVLP use such as DeVil-
biss HC-4419 and HC-4719. Other
types will not flow enough air 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
minimal pressure drop, which is
important for HVLP spraying.
2 . Attach the gravity feed cup to the
material inlet.
NOTE
Protective coating and rust inhibi-
tors 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.
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.
1 . If used, install paint liner into cup.
(See instructions included with cup.)
2 . Fill the gravity feed cup with the
material. Do not overfill. Make sure
that the cup lid vent hole is clear.
3 . Open the spreader adjustment valve
(9) (Fan) by turning the valve stem
counterclockwise.
4 . Close the fluid needle adjusting screw
(16) by turning clockwise.
5 . Turn on air supply and set gun inlet
pressure to lowest recommended pres-
sure for material being sprayed. Best
atomization will occur with 10 psig air
cap pressure. However, some materi-
als can be sprayed at lower pressures,
improving transfer efficiency.
6 . Spray a test area by turning fluid
needle adjusting
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.
If the finish sags, there is too much material
flowing for the atomization air pressure
being used.
Both of the above can be corrected by
increasing or decreasing the atomization air
pressure or the material flow. Pattern width
can be altered by turning spreader adjust-
ment valve (9), either clockwise to de-
crease the width or counterclockwise to
increase the width.
have
See Spray Gun Guide, SB-2-001 latest
revision, for details concerning setup of
spray guns.
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush exterior
with a stiff bristle brush. If necessary to
clean cap holes, use a broom straw or
toothpick if possible.
instrument is used, extreme care must be
used to prevent scratching or burring of the
holes which will cause a distorted spray
pattern.
SERVICE BULLETIN
SB-2-168-E
Replaces SB-2-168-D
Repair Kit KK-5058
screw (16)
If a wire or hard