Graco Official Manual for Paint Sprayer: H25, H40, H50 User Guide

Cycle Count Key/LED

Press to display cycle count.

To clear counter, press and hold for 3 sec.

Hydraulic Pressure Control Knob

Use to adjust hydraulic pressure available to the hydraulic drive system. Turn knob (HC) clockwise to increase pressure and counter- clockwise to decrease pressure. Use hydraulic pressure gauge (HP, page 17) to view hydrau- lic pressure.

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Component A and B outlet pressures will be higher than the hydraulic set pressure, depending on the model (see Pressure Ratio data; Systems, page 3). Component A and B pressure may be viewed on the pressure gauges (GA, GB), or the higher of the two pressures may be displayed on the motor control panel (MC). See FIG. 3, page 17.

Motor Control Arrow Keys

Use or to:

•Adjust pressure imbalance settings, page 33.

•Adjust standby settings, page 37.

Spray Adjustments

Spray Adjustments

Flow rate, atomization, and amount of over- spray 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 exces- sive wear.

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

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

•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.

22 312062W