Graco Inc. UNICARB Pro AA4500 - Manual (Page 12)

12 308936
Gun Setup
3. Check the gun’s electrical grounding.
WARNING
FIRE, EXPLOSION, AND
ELECTRIC SHOCK HAZARD
Megohmmeter P/N 218979 (E) is not
approved for use in a hazardous area.
To reduce the risk of sparking, do not
use the megohmmeter to check electri-
cal grounding unless:
D The gun has been removed from the
hazardous area;
D Or all spraying devices in the hazardous area
are turned off, ventilation fans in the hazardous
area are operating, and there are no flammable
vapors in the area (such as open solvent con-
tainers or fumes from spraying).
Failure to follow this warning could cause fire,
explosion, electric shock and result in serious injury
and property damage.
A. Have a qualified electrician check the electrical
grounding continuity of the spray gun and air hose.
B. Turn the ES ON-OFF Lever to OFF.
C. Turn off the air and fluid supply to the gun. The
fluid hose must not have any fluid in it.
D. Make sure the air hose (A) is connected and the
hose ground wire is connected to a true earth
ground.
E. Measure the resistance between the gun handle
(7) and a true earth ground (D).
a. If using a black or grey air hose, use a me-
gohmmeter E) to measure the resistance. Use
an applied voltage of 500 minimum to 1000
volts maximum. The resistance should not
exceed 2 megohms.
b. If using a red turbine air hose, use an ohmme-
ter to measure the resistance. Resistance
should not exceed 100 ohms.
F. If the resistance is greater than the maximum
reading specified above for your hose, check the
tightness of the ground connections and be sure
the air hose ground wire is connected to a true
earth ground. If the resistance is still too high, re-
place the air hose.
01946A
E
A
Fig. 3D–E
D
7
4. Connect the gun exhaust tube.
Press the exhaust tube (56) onto the barbed adapter
on the bottom of the gun handle. Secure the tube with
the clamp (57) provided.
Fig. 4
01992A
56
57