IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.
DESCRIPTION
The high volume low pressure gravity
feed GTI gun is designed to apply a wide
variety of finishing materials. This gun was
manufactured to provide a maximum
transfer efficiency by limiting air cap
pressure to 10 psi (complies with rules
issued by SCAQMD and other air quality
authorities).
This gun will produce approximately 10 psi
air cap pressure at 30 psi gun inlet pressure.
An air cap test kit is available (see Acces-
sories) which can be utilized to set the exact
air cap presssure. Air consumption for this
gun (with #2000 cap) is 15.5 scfm at 10 psi
air cap pressure.
NOTE
This gun includes 300 series stain-
less steel fluid tip and needle.
The fluid passageway is plated
aluminum. Guns may be used with
chlorinated solvent materials only
if the attached gravity cup is Acetal
or Nylon. Do not use aluminum
cups with chlorinated solvent
materials.
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.
SERVICE BULLETIN
SB-2-168-N
Replaces SB-2-168-M
Repair Kit KK-5058-2
GTI
®
HIGH VOLUME LOW PRESSURE GRAVITY FEED SPRAY GUN
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-511 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 ap-
proved for HVLP use such as DeV-
ilbiss 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-511. Some competitive
adjusting valves have significant
pressure drop that can adversely
affect spray performance. Models
HAV-500 and HAV-511 have 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. Fill the gravity feed cup with the mate-
rial. Do not overfill. Make sure that the
cup lid vent hole is clear.
2. Open the spreader adjustment valve
(10) (Fan) by turning the valve stem
counterclockwise.
3. Close the fluid needle adjusting screw
(17) by turning clockwise.
4. 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.
5.
Spray a test area by turning fluid needle
adjusting screw (17) 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 mate-
rial 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
adjustment valve (10), either clockwise to
decrease the width or counterclockwise to
increase the width.
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. 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.
(Continued on page 3)
#2000 Millennium Air Cap
PSI / CFM Information
INLET
CAP
PRESSURE PRESSURE
at handle
fan fully
CFM
of gun
open FLOW
(PSI)
(PSI) (CFM)
8
2 7.5
14.5
4
10.5
20
6 12.5
24.5
8
14.5
30
10 15.5
