Binks AA4400M Instructions De Service page 4

EN
Before proceeding, make sure trigger lock is engaged.
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 17 bar [250 psi]. Actual starting
pressure points may be higher or lower than 17 bar [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. 1 bar [14 psi] is the
maximum inlet air pressure for HVLP (1 bar [15 psi]
max. for HVLP twist tip cap), or use 1.4-2.8 bar [20-40
psi] inlet air pressure for LVMP. The HVLP flat tip and
twist tip air caps consume 230 L/m [8.3 SCFM] air at
their respective maximum inlet air pressures. The
LVMP flat tip and twist tip air caps consume 368 L/m
[13 SCFM] at 2.1 bar [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 3.4 bar [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.
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)
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
SPRAY GUN SET-UP
NOTE
FLUID TIP SELECTION
FLUID HOSES
TYPICAL HOOK-UP
Pump
Air
Regulator
Air
Air
Fluid Filter
Fan pattern adjustment: turn knob counterclockwise to
decrease pattern; clockwise to increase pattern (Fig. 2).
For HVLP spray, fan adjustment feature requires 1 bar [14
psi] max. of air inlet pressure (1 bar [15 psi] max. for HVLP
twist tip.) For LVMP spray, fan adjustment requires
approximately 1.4-2.8 bar [20-40 psi] of air inlet pressure.
Higher fluid pressure requires higher air inlet pressures to
accommodate pattern adjustment.
Do not hang gun by trigger. This will cause needle damage
or malfunction.
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.
critical to select the appropriate fluid hose that is rated for
the pressure range at which the airless gun is operated.
4 / 13
Oil and Water
Extractor
Regulator
Gun
Fluid Figure 1
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.
Figure 2
NOTE
NOTE
77-2922-R10.1 (2/2016)
Air
In