Operation – Graco Inc. 218-745 User Manual

Page 10

307-712

OPERATION

Adjust the Spray Pattern

Follow the steps below to establish the correct fluid flow
and air flow. DO NOT turn the turbine air on yet.

Adjust the fluid flow for the appropriate flow rate by
using the fluid pressure regulator installed in the fluid
line. Check the fluid nozzle chart in manual 307–803
for the appropriate flow rate for the air cap. Start with
the lowest rate shown and increase it until you get the
desired flow rate.

For fine adjustment of how much fluid is sprayed,
tighten or loosen the trigger adjusting nut (24). See
Fig 4. Turn the nut

out to reduce the amount of fluid

sprayed or turn it

in to increase the amount.

Close the fan adjusting knob (56) by turning it fully
clockwise.

Use an air pressure regulator to adjust the degree of
atomization. Always use the lowest air pressure pos-
sible for the most efficiency.

Use the

fan adjusting knob to change the shape of

the spray pattern. Turn the knob

counterclockwise

for a wide pattern and

clockwise for a solid, round

pattern. When increasing to a wide, flat pattern, it
may be necessary to increase the supply of fluid to
the gun to maintain the same amount of coverage
over a large area.

First, complete all the checks under the Operating
Checklist on page 9. Then turn the turbine air on.
When spraying, the

ES indicator light (51) should

glow, indicating the electrostatic charge.

NOTE: Provide a 3.1 bar (45 psi) clean, dry, regulated air

supply to the gun to ensure full voltage from the
power supply. The gun may be operated at lower
turbine air pressure, but may lose some electro-
static effect. Do not operate the turbine at an air
pressure greater than 3.1 bar (45 psi) as there is
no benefit and turbine life will be reduced.

NOTE: A remote fan air adapter is available to control

the fan air at the control booth. See
ACCESSORIES.

See the Spray Pattern Troubleshooting Chart
on page 13 to correct spray pattern problems.

Fig 2

KEY

Trigger Adjusting Nut

ES Indicator Light

Fan Adjusting Knob

Fig 3
Fig 4