Setup
6. Adjust the Spray Pattern (continued)
NOTE:
DIf the fluid adjustment knob is turned in all the way the gun will emit only air.
DFor continuous spraying, turn the fluid adjustment knob (8) counterclockwise until no restriction of the trigger movement is felt. When the knob is turned out far enough, the trigger should be able to touch the gun handle when the gun is triggered. For the typical fluid adjustment knob setting, turn the knob out 1/2 turn more. This setting provides maximum fluid flow and prevents premature wear on the fluid nozzle.
E.Open the pattern adjustment valve (25) by turning the knob fully counterclockwise to achieve a full fan pattern.
25
Close | Open |
(narrower | (wider |
pattern) | pattern) |
F
01997
Fig. 13
Pressure Drop Chart
5/16 inch (7.9 mm) I.D. hose
Recommended hose size to minimize excessive pressure drop. Expected pressure drops measured using 25 ft. (7.625 m) long hose, with gun triggered.
Air Regulator Pressure | Gun Inlet Pressure |
Setting |
|
psi (kPa, bar) | psi (kPa, bar) |
|
|
18.5 (128, 1.3) | 10 (70, 0.7) |
|
|
34.0 (238, 2.3) | 20 (140, 1.4) |
|
|
48.0 (335, 3.3) | 30 (210, 2.1) |
|
|
62.5 (427, 4.3) | 40 (280, 2.8) |
|
|
76.5 (525, 5.3) | 50 (345, 3.4) |
|
|
90.5 (624, 6.3) | 60 (410, 4.1) |
|
|
Fig. 12
7040A
G. Test the spray pattern and atomization while hold- |
ing the gun about 6 to 8 inches (150 to 200 mm) |
from the test piece. |
H. If the spray pattern is too wide with the pattern |
adjustment knob (13a) turned fully counterclock- |
wise, turn the pattern adjustment knob clockwise |
F.Using the air pressure regulator (F), set the air supply pressure at about 50 psi (345 kPa, 3.4 bar). See the Pressure Drop Chart for regulator setting versus gun inlet pressure comparison.
If available, use the fluid manufacturer’s recom- mendations to set the air line pressure for a high volume, low pressure, spray gun application.
NOTE: Local laws may limit the maximum pres- sure to 10 psi (70 kPa, 0.7 bar) at the air cap for HVLP compliance. The accessory Air Cap Verifica- tion Kit is available to measure the atomizing pres- sure at the air cap.
| until you have the desired pattern size. |
| NOTE: Turning the pattern adjustment knob fully |
| clockwise will produce a round pattern. |
I. | Check the atomization quality again. Increase the |
| gun air supply pressure with the air pressure regu- |
| lator in 5 psi (34 kPa, 0.3 bar) increments until you |
| obtain the desired atomization. |
J. | If after increasing the gun air supply pressure the |
| atomization is still unacceptable, try installing a |
| larger fluid nozzle size to reduce the fluid velocity. |
| Refer to Fig. 10. Repeat steps |
| obtain the desired atomization. |