Graco Inc. 244592 - Manual (Page 20)

Operation
20 309298J
Set the Atomization Fluid
Pressure
Atomization fluid pressure will vary based on the viscos-
ity of the fluid, flow rate desired, and other system char-
acteristics.
1. Turn off the turbine air (TA) and atomization air (A2).
2. Start the pump. Set the fluid regulator to 400 psi (2.8
MPa, 28 bar).
3. With the turbine air (TA) and atomization air (A2)
turned off, spray a test pattern, holding the gun 12
in. (305 mm) from the surface. Examine the particle
size. Do not be concerned about the presence of
tails; they will be removed in step 6.
4. Increase the fluid pressure in small increments.
Spray another pattern and compare the particle
size. Smaller particle size indicates improved atomi-
zation.
5. Continue to increase the fluid pressure and spray
test patterns. Do not exceed 3000 psi (21 MPa, 210
bar) fluid pressure. When the particle size remains
constant, the fluid is being atomized at the lowest
possible fluid pressure.
For improved atomization at lower fluid flow rates,
change to a smaller tip orifice size.
6. Turn on the atomization air (A2) and adjust the air
pressure until the tails disappear.
See Spray Pattern Troubleshooting on page 32 to cor-
rect spray pattern problems.
Fig. 12. Manifold Air Connections
Fig. 13. Eliminating Tails
WARNING
Pressurized Equipment Hazard
To reduce the risk of an injury, never exceed
the maximum working pressure of the low-
est rated system component. Maximum
working fluid pressure of this equipment is
3000 psi (21 MPa, 210 bar).
TI1739A
A2
CYL
KV2
TA
KV1
No Air Too Little
Air
Correct
Amount of Air