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Setup
313869B 17
NOTE: A larger fluid nozzle at a reduced fluid
pressure will maintain the same flow rate, but
the fluid stream (velocity) will slow down.
When air is applied, the lower velocity allows
the air to act on the fluid longer, which
improves atomization.
2. Using the air pressure regulator (F), set the
fan and atomizing air supply pressure per
Table 1. Use these suggested settings as a
starting point.
NOTE: HVLP Gun Limits
HVLP Guns: local laws may limit the maximum
pressure to 10 psi (70 kPa, 0.7 bar) at the air
cap for compliance. See the table on page 8
for maximum HVLP manifold inlet pressures.
To measure pressure at the air cap, use the
appropriate HVLP Pressure Verification Kit.
3. Test the spray pattern atomization while
keeping the gun a consistent distance,
about 6 to 8 inches (150 to 200 mm), from
the test piece.
Check the atomization quality. Increase the
gun atomizing air supply pressure with the
air pressure regulator in 5 psi (34 kPa, 0.3
bar) increments until you obtain the desired
atomization.
NOTE: For the best transfer efficiency, use the
lowest setting needed to achieve desired finish
quality.
4. If the spray pattern is too wide or split,
reduce the fan air pressure.
NOTE: Reducing the fan air pressure to 0 psi
(or fully closing the fan adjustment valve) will
produce a round pattern.
To further control the spray pattern, use an
alternate air cap. For a list of available air caps,
see page 8.
FIG. 11: Fluid Pressure Regulator
Table 1: Suggested Starting Settings
Spray
Type
Fan Air
psi (MPa, bar)
Atomizing Air
psi (MPa, bar)
Conven-
tional
43 (0.3, 3.0) 43 (0.3, 3.0)
HVLP 15 (0.1, 1.0) 15 (0.1, 1.0)
HiTEch 29 (0.2, 2.0) 29 (0.2, 2.0)
LVMP 43 (0.3, 3.0) 43 (0.3, 3.0)
Air Brush NA 29 (0.2, 2.0)
L
ti7019a
FIG. 12: Air Pressure Regulator
F
ti01997