Graco PRO AA4500 Instructions-Parts List Manual page 14

11. Set the Atomization
Fluid Pressure.
viscosity of the fluid, the flow rate desired, and other
NOTE: Atomization fluid pressure will vary based on the
characteristics of your system.
P ktomization
Chart
Fluid Viscositv Increments Pressure
Starting Fluid Fluid Pressure
40 or more
seconds in #2
1500
psi
(105 bar)
(1 4 bar)
Zahn cup*
200 psi
25-40 se-
I
000
psi 100 psi
conds in #2
(70
bar)
(7
bar)
Zahn cup**
25 or less
500 psi 100 psi
seconds in #2
(35 bar) (7
bar)
Zahn
CUD***
Includes fluids with 60% volume solids or greater.
Examples: high-build high-solidsprotectiieurethanesand
epoxies
Examples: aikydenamels, some protectiveurethanes and
epoxies
Examples: stains, lacquers, and decorative urethanes
A. Close the air control valve
(43)
by turning it fully
clockwise and turn the
ES
ON-OFF lever (26) to
0
FF.
**
Includes fluids with
40
to 60% (medium) volume solids.
***
Includes fluids with 40% volume solids or
less.
&"\
close,
I
&
6 .
Setthe fluid
pressure with
the fluid regulator
(J),
based on the Starting
Fluid
Pressure in the At-
omlzatlon Chart
at left for the type of fluid you
are spraying.
Fig 11 .B
C.
With the
ES
ON-OFF lever OFF and the air con-
trol valve closed, spray a test pattern across a
piece of paper, holding the gun
12
inches
(305
mm) from the surface.
Without being concerned about the presence
of
"tails", note the particle size.
D.
Increase
the
fluid pressure by the
fluid
Pres-
sure lncrement shown
in
the Atomization
Chart
for
the
type
of
fluid
you
are spraying.
E.
Spray another test pattern across a piece
of
,,
01899
paper.
E
Without being concerned about the presence
of "tails", compare the particle size
of
the
two
test patterns.
A
decrease in particle size indicates improved
atomization.
Fig 1 l.A
01638
14 308-294