Operation; Pressure Relief Procedure; Operating Checklist; Selecting A Fluid Nozzle And Air Cap - Graco PRO 5500hc Instructions Manual

Pressure Relief Procedure

WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. To
reduce the risk of an injury from accidental spray
from the gun, splashing fluid, or moving parts,
follow the Pressure Relief Procedure whenever
you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
and install or clean the fluid nozzle.
1. Turn off all the air to the spray gun except the
cylinder air, which triggers the gun. If an air pilot
fluid regulator is used in the system, the air pres-
sure is needed at the regulator air inlet.
2. Turn off the fluid supply to the gun.
3. Trigger the gun into a grounded metal waste
container to relieve fluid pressure.
4. If the air pilot fluid regulator is used, turn off the air
pressure at the regulator air inlet.
5. Relieve fluid pressure in the fluid supply equipment
as instructed in its instruction manual.
6. Turn off the main air supply by closing the bleed-
type master air valve on the main air supply line.
Leave the valve closed until you are ready to spray
again.

Operating Checklist

Check the following list daily, before starting to operate
the system, to help ensure you of safe, efficient opera-
tion.
____ 1. All the operators are properly trained to
safely operate an automatic electrostatic air
spray system as instructed in this manual.
____ 2. All the operators are trained how to properly
relieve pressure, using the Pressure Relief
Procedure at left.
16 308–442

Operation

____ 3. The warning sign provided with the gun is
____ 4. The system is thoroughly grounded and the
____ 5. The condition of the electrical components of
____ 6. The ventilation fans are operating properly.
____ 7. The workpiece hangers are clean and
____ 8. All the debris, including flammable liquids
____ 9. All flammable liquids in the spray booth are
____ 10. All conductive objects in the spray area are
____ 11. The manifold exhaust tubes have been

Selecting a Fluid Nozzle and Air Cap

PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of an injury, follow the Pressure
Relief Procedure, above, before removing or
installing a fluid nozzle and/or air cap.
The gun is supplied with a 0.059 in. (1.5 mm)) fluid
nozzle, part no. 191–833, and air cap, part no.
177–033. If your application requires a different nozzle
and air cap combination, use instruction manual
307–803 or consult your authorized Graco distributor
to select the appropriate fluid nozzle and air cap.
Install the air cap and fluid nozzle into the gun barrel
as instructed in Air Cap/Nozzle/Resistor Stud
Replacement, page 29.
mounted in the spray area where it can be
easily seen and read by all operators.
operator and all persons entering the spray
area are properly grounded. See Ground
the System, page 13.
the spray gun has been checked as
instructed in Electrical Tests, page 26.
grounded. Contact points must be sharp
points or like knife edges.
and rags, is removed from the spray area.
in approved, grounded containers.
electrically grounded and the floor of the
spray area is electrically conductive and
grounded.
checked for the presence of any fluid as
instructed in Check for Fluid Leakage , page
22.
WARNING