Graco PRO 5500wb Instructions-Parts List Manual page 21

Operating the Spray Gun (continued)
Follow the steps below to establish the correct fluid
flow and air flow. Do not turn on the turbine air/electro-
statics (TA) yet.
CAUTION
If any fluid leakage from the gun is detected, stop
spraying immediately. See Check for Fluid Leak-
age, page 25.
1. Complete all the checks under the Operating
Checklist on page 20.
2. Make sure the system voltage is discharged.
Loosen the air cap retaining nut, and rotate the air
cap for a vertical or horizontal spray pattern. See
Fig. 18. Then 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.
Vertical Pattern
Horizontal Pattern
Fig. 18
3. Apply a minimum of 50 psi (345 kPa, 3.5 bar) air
pressure to the cylinder air fitting (CYL) to activate
the on/off sequence of atomization air (A1), fan air
(A2), and fluid (P1). Refer to Fig. 19.
4. Turn the gun functions off and on by using the air
solenoid valves on the cylinder (CYL) and turbine
(TA) air supply lines. Refer to Fig. 2, page 10.
NOTE: To trigger the fluid alone, shut off and relieve
the air pressure to the atomization (A1) and fan (A2)
air lines, using the bleed-type air shut-off valves. Apply
50 psi (345 kPA, 3.5 bar) air pressure to the cylinder
air fitting (CYL) to trigger the fluid.
Operation
5. Part No. 237603 and 236824 Spray Guns: Pres-
surize the fluid supply, and adjust the fluid flow
with the fluid pressure regulator installed in the
fluid line.
Part No. 238091 Spray Gun: Set the fluid supply
pressure to the gun at 70 to 80 psi (480 to 550
kPa, 4.9 to 5.6 bar). Control the fluid flow out of
the gun by adjusting the air pilot pressure to the
gun-mounted fluid regulator. Increase or decrease
the pilot air pressure until you have the desired
flow rate.
NOTE: The fluid regulator has a air bleed hole in
the cover, which will emit some air leakage.
6. Use the air pressure regulator on the atomization
air supply line (A1) to adjust the degree of atom-
ization. For example, for a fluid flow rate of
10 ounces per minute (0.3 liters/min.), a typical
atomization pressure would be about 20 to 30 psi
(140 to 210, 1.4 to 2.1 bar) at the gun manifold.
7. Use the air pressure regulator on the fan air supply
line (A2) to adjust the pattern size.
NOTES:
D For the most efficiency, always use the lowest
atomizing air pressure possible.
D 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.
D See Spray Pattern Troubleshooting on page 32
to correct spray pattern problems.
02020
TA
CYL
A1
P1
Fig. 19
Manifold Back View
Continued on the next page.
308496
F.O.
A2
EXH
(PA)
04302
21