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Operation
Adjust the Spray Pattern
1. Start the pump. Connect the electric power to the
heater (50). Turn the 3-way recirculation valve (28)
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 regulator (G) 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 adjust-
ment procedures. Higher pressures and tempera-
tures may not improve the spray pattern and will
cause premature component wear.
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
on page 24 and to your separate component manu-
als.
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 (28) to the circulation position. Do not install
a fluid shutoff device between the heater and the
gun.
5. Use a full-open, full-close triggering action. Hold
the gun about 14 in. (350 mm) from and at right
angles to the work surface. Move the gun in a
straight stroke; do not swing the gun in an arc.
Practice to find the best length and speed of
stroke.
6. If adjusting the pressure does not give a good
spray pattern, relieve the pressure and try another
tip size. When more coverage is needed, use a
larger spray tip rather than increasing the fluid
pressure.
7. With the pump and lines primed, and with ade-
quate air pressure and volume supplied, the pump
will continue to cycle as long as air is supplied and
the back pressure regulator (46) is open.
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.
Shutdown and Care of the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 13.
For overnight shutdown, stop the pump at the bottom
of its stroke to prevent fluid from drying on the ex-
posed displacement rod and damaging the throat
packings. Relieve the pressure.
Always flush the pump before the fluid dries on the
displacement rod. See Flushing on page 18.