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Operation
333309E 21
7. Allow pumps to run until mixed material is flowing
from the front of the gun then release the gun trig-
ger.
8. Engage the gun trigger lock.
9. Install the tip guard, spray tip and/or air cap.
10. Increase pump air pressure regulator (H) and gun
air pressure regulator (D) until desired fluid and air
pressure is achieved.
11. Disengage the gun trigger lock and spray. See
Spray Gun Adjustment. page 21.
NOTE: The following section is intended as a general
guideline for spray gun operation. Refer to the appropri-
ate spray gun manual for more details.
Spray Gun Adjustment
For AA Spray Guns
Adjust the Atomization
1. Do not turn on atomizing air supply. Fluid pressure
is controlled by the air pressure supplied to the
pump (pump air pressure regulator). Set fluid pres-
sure at low starting pressure.
• For low viscosity fluids (less than 25 sec, #2
Zahn cup) with lower percent solids (typically
less than 40%), start at 300 psi (2.1 MPa, 21
bar) at pump outlet.
• For fluids with higher viscosity or higher solids
content, start at 600 psi (4.2 MPa, 42 bar).
Refer to the following example.
Example:
2. Hold gun perpendicular and approximately 12
inches (304 mm) from surface.
3. Move gun first, then pull gun trigger to spray onto
test paper.
4. Increase fluid pressure in 100 psi (0.7 MPa, 7 bar)
increments, just to the point where a further
increase in fluid pressure does not significantly
improve fluid atomization. Refer to the following
example.
Example:
Adjust the Spray Pattern
Packages with Airless Guns
The spray tip orifice and spray angle determine pattern
coverage and size. When you need more coverage, use
a larger spray tip rather than increasing fluid pressure.
Align guard horizontally to spray a horizontal pattern.
Align guard vertically to spray a vertical pattern.
H
D
Pump
Fluid/Air
Pressure
Ratio
Pump Air
Regulator Setting
psi (MPa, bar)
Approximate
Fluid Pressure
psig (MPa, bar)
15:1 x 20 (0.14, 1.4) = 300 (2.1, 21)
30:1 x 20 (0.14, 1.4) = 600 (4.2, 42)
Pump
Fluid/Air
Pressure
Ratio
Pump Air Regulator
Increment
psi (MPa, bar)
Incremental
Fluid Pressure
psi (MPa, bar)
15:1 x 7 (.05, 0.5) = 100 (0.7, 7.0)
30:1 x 3.3 (0.02, 0.2) = 100 (0.7, 7.0)