Operation; Pressure Relief Procedure; Adjust The Spray Pattern - Graco PerformAA 26B570 Instructions Manual

Operation

Operation

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection and splashing
fluid, follow the Pressure Relief Procedure when you
stop spraying and before cleaning, checking, or
servicing the equipment.
1. Turn off the air and fluid supply to the gun.
2. Close the bleed-type master air valve (required in
the system).
3. Hold a metal part of the gun firmly to a grounded
metal pail. Trigger the gun to relieve pressure.
F . 12: Pressure Relief
IG
4. Open the pump drain valve (required in the system)
to relieve fluid pressure in the displacement pump.
In addition, open the drain valve connected to the
fluid pressure gauge (in a system with fluid
regulation) to relieve fluid pressure in the hose and
gun. Have a container ready to catch the drainage.
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5. Leave the drain valve(s) open until you are ready to
spray again.
6. If you suspect that the spray tip or hose is
completely clogged or that pressure has not been
fully relieved:
a. Very slowly loosen the retaining ring or the hose
b. Loosen the coupling completely.
c. Clear the obstruction in the hose or tip.

Adjust the Spray Pattern

To avoid serious injury from skin injection, do not put
your hand in front of the spray tip when operating the
spray gun.
The air assist spray gun combines airless and air spray
concepts. The spray tip shapes the fluid into a fan
pattern, as does a conventional airless spray tip. Air
from the air cap further atomizes the fluid and completes
the atomization of the paint tails into the pattern to
produce a more uniform pattern.
The fan air can be used if necessary to slightly adjust
the pattern size.
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NOTE: Air assist spray guns differ from air spray guns in
that increasing the fan air reduces the pattern width. To
increase the pattern width, use less fan air or a larger
size tip.
1. Set the fluid pressure at 300 psi (2.1 MPa, 21 bar)
with the fluid regulator.
2. Trigger the gun to check the atomization; do not be
concerned about the pattern shape yet.
3. Slowly Increase the fluid pressure just to the point
where a further increase in fluid pressure does not
significantly improve fluid atomization.
end coupling to relieve pressure gradually.
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