Graco Inc. 222300 - Manual (Page 13)

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Operation
Operating the Spray Gun (continued)
1. Follow the Operating Checklist on page 11.
2. To adjust the air cap for a vertical or horizontal
spray pattern, first make sure the pressure is
relieved. Then loosen the air cap retaining nut, and
rotate the air cap as directed in Fig. 5. Tighten the
retaining nut until the air cap is held firmly in place;
you should not be able to rotate the air cap horns
by hand.
Fig. 5
02020
Horizontal Pattern
Vertical Pattern
3. Adjust the fluid flow by using the fluid line pressure
regulator. Refer to instruction manual 307803 to
set the fluid pressure for various fluid flows, ac-
cording to the size of the fluid nozzle being used.
4. If necessary, further adjust the fluid flow rate with
the fluid adjustment knob (45). See Fig. 4.
5. Fully open the fan air valve (43).
6. Set the air pressure with the air pressure regulator.
The following chart shows the air hose inlet pres-
sure required to get full voltage from the power
supply. To avoid shortening the turbine life, do not
exceed the recommended air pressures.
Air Hose
Length
ft. (m)
Dynamic pressure at air hose inlet
required for full voltage
psi (bar, MPa)
15 (4.6) 45 to 50 (3.1 to 3.5, 0.31 to 0.35)
25 (7.6) 50 to 55 (3.5 to 3.8, 0.35 to 0.38)
50 (15.3) 60 to 65 (4.2 to 4.5, 0.42 to 0.45)
75 (22.9) 68 to 73 (4.7 to 5.0, 0.47 to 0.50)
100 (30.5) 75 to 80 (5.2 to 5.5, 0.52 to 0.55)
7. Set the atomizing air valve (31) about 1.5 turns out
for most applications. The Atomizing Air Valve
Adjustment chart shows the effect of the atomiz-
ing air valve adjustment on the air cap air flow.
8. Adjust the pattern width with the fan air valve (43).
Atomizing Air Valve Adjustment
0
10
20
30
40
50
60
70
80
90
100
0.00 0.50 1.00 1.50 2.00 2.50 3.00
Air Cap Air Flow (%)
Valve Turns
Fully Open Fully Closed
Fine Adjustments of the Spray Gun
D
To improve the atomization, open the atomizing air
valve further (31). If more atomizing air is needed
beyond the fully open position of the valve, increase
the air hose inlet pressure.
Use the lowest air flow settings needed for accept-
able atomization. The slower particle velocity will
improve the electrostatic effect.
D To reduce the atomization air and minimize any
overspray, turn the atomizing air valve in.
NOTE: See the Spray Pattern Troubleshooting
chart on page 16 to correct spray pattern problems.
9. Turn the ES ON-OFF lever to ON to begin spray-
ing with the electrostatics. When spraying, the ES
indicator light (DD) should glow, indicating the
electrostatic charge.
CAUTION
Hang the gun with its nozzle pointing down when it is
not being used to avoid having fluid run into the gun
air passages. Fluid in the gun air passages can
cause poor atomization and excessive current de-
mands and damage the gun.