1. Connect your high-pressure fluid hose to the gun fluid inlet
and tighten securely.
2.
Connect your air hose to the gun air connection and tighten
securely.
3. Slowly increase air to the pump to obtain a fluid pressure at
the gun’s lower end of the pressure range. A typical starting
fluid pressure is 250 psi. Actual starting pressure points may
be higher or lower than 250 psi and depend on the setup
including the type of pump used, the type of material sprayed,
and the spray gun itself.
4. Using the control knob on the air regulator, set the air
pressure at zero.
5. To test the spraying pattern, spray a piece of wood or
cardboard with a fast pass about one foot away from the
surface. The results of the test will allow you to determine the
uniformity of the particle size and spraying pattern.
6.
If the spraying pattern develops tails or is not uniform,
gradually increase the air pressure as necessary to develop a
uniform spraying pattern. 14 psi is the maximum inlet air
pressure for HVLP (15 psi max. for HVLP twist tip cap), or
use 20-40 psi inlet air pressure for LVMP. The HVLP flat tip
and twist tip air caps consume 8.3 SCFM air at their
respective maximum inlet air pressures. The LVMP flat tip
and twist tip air caps consume 13 SCFM at 30 psi inlet air
pressure. The air is used to assist the atomization of the
coating.
7. If the quality of spray is acceptable, begin spraying. If the
spraying rate is too slow to keep up with the production line
speed, or if the quantity of material sprayed is inadequate for
acceptable coverage, gradually increase the fluid pressure in
50 psi increments using the fluid regulator control knob.
However, note that as the fluid pressure increases, more air is
needed to eliminate the tails.
Consistency in spraying can be increased across spray gun
operators and similar spraying jobs by developing pressure
standardization charts. Repeat step 6 until the required material
coverage and spraying speed are achieved. If the maximum fluid
pressure is reached before the required material coverage and
spraying speed are achieved, you may need to switch to a larger
fluid tip.
TYPICAL HOOK-UP
Fan pattern adjustment: turn knob counterclockwise to
decrease pattern; clockwise to increase pattern (Fig. 2).
SPRAY GUN SET-UP
Pump
Regulator
Regulator
Air
Air
Air
Fluid
Fluid Filter
Oil and Water
Extractor
Figure 1
Figure 2
Fan
Adjustment
Control Knob
When using the
twist tip air cap, the
primary purpose of
the fan pattern
adjustment knob is
to eliminate tails in
the spray pattern.
FLUID TIP SELECTION
Factors to consider in selecting a fluid tip for an air-assist
airless spray gun include (1) the size of the parts being
sprayed; (2) the production line speed; (3) the material flow
rate and film thickness; (4) the viscosity of the material
applied; (5) the type of material applied; and (6) the quality of
atomization of the coating required.
The selection of a fluid tip necessary to perform a specific
spraying job is best determined through a combination of
experimentation and expert advice from your material and
equipment suppliers.
FLUID HOSES
Air-assist airless spray guns operate at fluid pressures higher
than operating pressures of air spray guns. As a result, when
operating an air-assist airless spray gun, it is critical to select
the appropriate fluid hose that is rated for the pressure range at
which the airless gun is operated.
Air
In
NOTE
For HVLP spray, fan adjustment feature requires 14 psi
max. of air inlet pressure (15 psi max. for HVLP twist tip.)
For LVMP spray, fan adjustment requires approximately
20-40 psi of air inlet pressure. Higher fluid pressure
requires higher air inlet pressures to accommodate pattern
adjustment.
NOTE
Before proceeding, make sure trigger lock is engaged.
NOTE
Do not hang gun by trigger. This will cause needle damage
or malfunction.
Gun
EN
77-2921-R12 (2/2021)
4 / 14
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