System Shutdown; Flushing - Graco AirPro 237413 A Series Instructions-Parts List Manual

Operation
4. Open the fan pattern adjusting valve (E) by turning it
fully counterclockwise, then turn it in 1 to 2 turns.
See F . 8.
IG
F . 8
IG
5. Spray a stationary test pattern on scrap paper. Hold
the gun 10 to 12 in. (250-300 mm) from the paper
and spray for 2 or 3 seconds. If the spray pattern is
poorly atomized, the air and/or fluid pressures may
need adjustment.
If the spray pattern atomization is not fine enough,
increase the gun air pressure. If the spray pattern
atomization is too fine, decrease the gun air pres-
sure. If the atomization is still not good enough, try
lowering the fluid pressure in increments of 2 or 3
psi (14 or 21 kPa, 0.1 or 0.2 bar) to achieve the
desired finish quality.
NOTE: For the most efficient paint usage, use the low-
est air pressure needed to obtain a good finish. Higher
air pressures create more overspray and uses more
fluid.
When using catalyzed materials, observe the fluid pot
life as recommended by the fluid manufacturer.
Always flush the system before the pot life has
expired to prevent dried fluid which may be difficult to
clean out and may damage the system.

System Shutdown

Shut down the system at the end of the work shift and
before checking, adjusting, cleaning or repairing the
system. Always follow the Pressure Relief Procedure,
on page 10.
12
E
CW
CCW
ti2120a
NOTICE

Flushing

When to flush
• Before the first time use
• When changing colors
• Before fluid can dry or settle out in a dormant
system (observe the recommended fluid pot life
on catalyzed fluids)
• Before storing the system
How to flush
See F . 9.
IG
1. Relieve pressure.
2. Remove the air cap before flushing. Clean it sepa-
rately.
3. Remove the pressure pot cover. Remove the tank
liner, if used. Pour in 1 gal. (4 liter) or place a 1 gal.
(4 liter) metal pail of compatible solvent in the pres-
sure pot. Install the cover and tighten the c-clamp
handles (27) to 8-10 ft-lbs.
4. Make sure the pressure pot and gun air regulators
(33, 36) and the master air valve (A) is closed.
5. Be sure the air relief valve (7) is closed (clockwise).
6. Open the master air valve (A).
7. Open the pressure pot air shutoff valve (17b).
8. Set the pressure pot air regulator to 20 psi (138 kPa,
1.4 bar).
9. Open the gun fluid shutoff valve (18).
10. Hold the gun against and aimed into grounded
metal waste pail. Trigger the gun slowly. When fluid
flows freely, release the gun trigger.
11. For a first-time flush: trigger the gun and flush with
solvent for 30 seconds.
For flushing after spraying fluid: trigger the gun
and flush with solvent until the system is thoroughly
cleaned. Repeat with clean solvent, if necessary.
12. Release the gun trigger, close the pressure pot air
shutoff valve (17b).
13. Relieve pressure.