System Component Information - Graco A Series Instructions-Parts List Manual

System Component Information

I. How to use the electrostatic air
spray gun (Fig. 5)
The air hose supplies air to the spray gun. Part of the
air operates the turbine and the rest of it atomizes the
fluid being sprayed. The turbine generates power
which is converted by the power cartridge to supply
high voltage to the gun's ionizing electrode.
The pump supplies fluid to the hose and gun, where
the fluid is electrostatically charged as it passes the
electrode. The charged fluid is attracted to the
grounded workpiece.
1. This gun has a dual triggering action. When you
squeeze the trigger, the first action is to open the
air. The second action, fully triggering the gun,
opens the fluid. Some startup procedures may
require that you trigger only the air.
2. Loosen the air cap retaining ring (G) and rotate the
air horns to obtain the desired spray position.
Tighten the retaining ring snugly, but do not over-
tighten. If the horns of the air cap are vertical, the
spray pattern will be horizontal. If the horns are
horizontal, the spray pattern will be vertical. See
Fig. 6.
3. See the gun instruction manual, 307–912, for
detailed information, including troubleshooting,
cleaning, and repair.
CAUTION
Always hang the gun with its nozzle pointing down to
prevent solvent from running to the gun air pas-
sages. Solvent in the gun air passages can cause
poor atomization and excessive current demands
and damage the gun.
II. How to use the recirculation feature
(Fig. 7)
The recirculation tube (37) returns unused fluid to the
fluid container, ensuring an even flow at the gun.
Recirculation also provides gentle fluid agitation.
1. To recirculate fluid, open the recirculating valve
(35).
2. To stop recirculation, close the valve (valve handle
at a right angle to the body of the valve). See Fig.
7.
3. For gentle fluid agitation while spraying, open the
recirculation valve partially, but maintain the pump
cycle rate specified in Startup.
KEY
A ES indicator light
B ES On–Off lever
I is ON and 0 is OFF
C Fan air control valve
D Electrode
E Air cap
E
D
F
Fig. 5
Air cap horns shown horizontal
which produces a vertical
spray pattern
Air cap horns shown vertical
which produces a horizontal
spray pattern
Fig. 6
Shown in open position
Fig. 7
A
E
I O
S
B
C
35
37