HP GRACO OR PRO TI1681A - Manual (Page 23)

Operation
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8. Adjust the pump air regulator to start the fluid supply
unit. Adjust the fluid flow with the air pressure regu-
lator until the stream from the gun travels 8-12 in.
(200-300 mm) before falling off. Typically, if fluid
pressure is below 5 psi (.04 MPa, 0.4 bar) or above
20 psi (0.14 MPa, 1.4 bar), a change of nozzle size
is recommended. Refer to instruction manual
309419 to set the fluid pressure for various fluid
flows, according to the size of the fluid nozzle being
used.
9. Set the gun air regulator to deliver a minimum 40 psi
(0.28 MPa, 2.8 bar) at the gun when triggered, for
maximum transfer efficiency. See Table 3 .
• For the most efficiency, always use the lowest air
pressure possible.
• 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.
10. Spray a test pattern. Check the atomization. If over-
atomization occurs at minimum pressure, adjust the
air atomizing restrictor valve. If atomization is inade-
quate, increase the air pressure.
11. Adjust the fan air adjustment valve: clockwise for a
rounder pattern, counterclockwise for a wider pat-
tern.
12. Turn the ES ON/OFF switch ON (I).
Table 3: Air Regulator Settings
Air Hose Length
ft (m)
(5/16 in. [8 mm] diameter)
Air Regulator Setting
psi (MPa, bar)
(with gun triggered)
15 (4.6) 50 (0.35, 3.5)
25 (7.6) 60 (0.42, 4.2)
50 (15.3) 75 (0.52, 5.2)
TI1760A
8-12 in. (200-300 mm)
TI1281A
WARNING
Electric Shock Hazard
When the ES ON/OFF switch is turned ON,
the fluid supply is charged with high voltage
until the voltage is discharged. Contact with
the charged components of the spray gun
will cause an electric shock. Do not touch the gun
nozzle or electrode or come within 4 in. (102 mm) of
the front of the gun during operation.
ti1282a
ti1283a
ti1284a
I O ES