Binks AA4400M Instructions De Service page 3

NOTE
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 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 Trans-Tech. The HVLP flat tip and twist tip air
caps consume 8.3 SCFM air at their respective
maximum inlet air pressures. The Trans-Tech 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.
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
TYPICAL HOOK-UP
Pump
Air
Fan pattern adjustment: turn knob counterclockwise to
decrease pattern; clockwise to increase pattern (Fig. 2).
For HVLP spray, fan adjustment feature requires 14 psi max.
of air inlet pressure (15 psi max. for HVLP twist tip.) For
Trans-Tech spray, fan adjustment requires approximately
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.
FLUID TIP SELECTION
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
3 / 12
Oil and Water
Extractor
Regulator
Regulator
Air
Air
Fluid
Fluid Filter
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.
NOTE
NOTE
EN
Air
In
Gun
Figure 1
Figure 2