Graco Inc 308584 Atomizing Air Valve Adjustment, Fine Adjustments of the Spray Gun, Operation

Operation

7.Set the atomizing air valve (R) 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 (P).

Atomizing Air Valve Adjustment

	100
	90
(%)	80
	70
Flow
	60
	50
Air
	40
Cap
	30
	20
Air
	10
	0
	0.00	0.50	1.00	1.50	2.00	2.50	3.00

Fully Open Valve Turns Fully Closed

Fine Adjustments of the Spray Gun

DTo improve the atomization, open the atomizing air valve further (R). 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.

DTo reduce the atomization air and minimize any overspray, turn the atomizing air valve in.

9.Turn the ES ON-OFF lever (N) to ON to begin spraying with the electrostatics. When spraying, the ES indicator light (M) should glow, indicating the electrostatic charge.

NOTE: See Spray Pattern Troubleshooting on page 25 to correct spray pattern problems. See Voltage Loss Troubleshooting on page 22 to correct voltage problems.

10.Operate the voltage isolation system as instructed in the system manual. Normal spraying voltage for the system will be 45 to 55 kV.

11.Use the same spraying technique you would use with a conventional air spray system to coat the workpiece.

12.Relieve the pressure and discharge the voltage when you stop spraying.

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. See Fig. 11. Fluid in the gun air pas- sages can cause poor atomization and excessive current demands and damage the gun.

KEY-Fig. 10 M

JFluid Adjustment Knob M ES Indicator Light

N ES ON-OFF Lever

P Fan Air Adjustment Valve R Atomizing Air Valve

*N J P R

05151A

Fig. 10

Fig. 11 05424

308584 19