Graco 3A1705J important safety instructions Spray Adjustments

Spraying

12. Open gun fluid inlet valves A and B. 15. Equipment is ready to spray.

Note

On impingement guns, never open fluid manifold valves or trigger gun if pressures are imbalanced.

13.Disengage gun piston safety lock.

14.Test spray onto cardboard. Adjust pressure and temperature to get desired results.

Spray Adjustments

Flow rate, atomization, and amount of overspray are affected by four variables.

•Fluid pressure setting. Too little pressure results in an uneven pattern, coarse droplet size, low flow, and poor mixing. Too much pressure results in excessive overspray, high flow rates, difficult control, and excessive wear.

•Fluid temperature. Similar effects to fluid pressure setting. The A and B temperatures can be offset to help balance the fluid pressure.

•Mix chamber size. Choice of mix chamber is based on desired flow rate and fluid viscosity.

•Clean-off air adjustment. Too little clean-off air results in droplets building up on the front of the nozzle, and no pattern containment to control overspray. Too much clean-off air results in air-assisted atomization and excessive overspray.

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