Graco President 232090, Instructions-Parts List Manual

Page: 15 / 28

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Operation
Prime the Pump
1. Disconnect the electric power to the heater before
priming the pump.
2. Open the fluid shutoff valve (14).
3. Open the back pressure regulator (12). Turn the
3-way recirculation valve (19) to the circulation
position.
4. Open the spray gun at the last gun station and
keep it open while starting the pump.
5. Open the bleed-type master air valves (11h, B).
6. Slowly open the air filter/regulator (11a) until the
pump starts. The air filter/regulator controls the
pump speed and fluid outlet pressure.
7. When fluid comes from the gun, release the gun
trigger. The pump will continue to cycle as long as
air is supplied and the back pressure regulator (12)
is open.
8. One at a time, open any other guns in the system
to purge air from the lines.
NOTE: In a circulating system, the pump will continue
to cycle as long as air is supplied and the back pres-
sure regulator is open. In a direct supply system, the
pump starts when the gun is opened, and stops when
the gun is closed.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause
component rupture and serious injury,
never exceed the specified maximum air input
pressure to the package
(see Technical Data on
page 25).
CAUTION
Do not allow the pump to run dry. It will quickly
accelerate to a high speed, causing damage. If your
pump is running too fast, stop it immediately and
check the fluid supply. If the container is empty and
air has been pumped into the lines, refill the con-
tainer and prime the pump and the lines, or flush and
leave it filled with a compatible solvent. Eliminate all
air from the fluid system.
Adjust the Spray Pattern
1. Start the pump. Connect the electric power to the
heater. Turn the 3-way recirculation valve (19) to
the circulation position.
2. Set the heater control to a trial point (4 or 5).
3. Circulate fluid through the pump for at least 10
minutes, at very low pressure. Check the tempera-
ture on the heater thermometer.
4. Adjust the fluid pressure and temperature to the
lowest settings necessary to get the desired re-
sults. Use the air filter/regulator (11a) and the back
pressure regulator (12) to adjust the pump speed
and fluid pressure until the spray is completely
atomized. Refer to the back pressure valve and
heater manuals (supplied) for adjustment proce-
dures. Higher pressures and temperatures may
not improve the spray pattern and will cause
premature component wear.
5. To adjust the spray pattern, follow the complete
instructions in your gun manual.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your package, which could cause com-
ponent rupture and serious injury,
never
exceed 100 psi (0.7 MPa, 7 bar) air input pressure
to the package.
Also refer to the Technical Data
section on page 25 and to your separate compo-
nent manuals.
Heat causes fluid to expand. If the heated fluid is
trapped with nowhere to expand, it can cause
component rupture.
Be sure to keep the heated
fluid circulating by turning the 3-way recirculation
valve (19) to the circulation position.
Do not install
a fluid shutoff device between the heater and the
gun.