Activating And Adjusting The Electrostatics; Activating The Kv Switch; Spraying; Triggering The Fluid Alone - Graco 236685 Instructions And Parts List

Activating and Adjusting the
Electrostatics
1. Make sure the fan (A2) and atomizing (A1) air are
on, then turn on the turbine air (TA). Refer to Fig.
13, page 17.
2. The turbine air pressure should be adjusted to 30
psi (2.1 bar, 0.21 MPa) at the gun manifold inlet
when air is flowing. Do not exceed 40 psi (2.8 bar,
0.28 MPa) air pressure as there is no added
benefit and turbine life could be reduced.
Use the chart below to set the proper pressure at
the turbine hose inlet. Do not exceed these recom-
mended pressures or turbine life will be reduced.
Turbine Air Dynamic pressure at the turbine
Hose Length hose inlet required for full voltage
15 ft. (4.6 m) 36 psi (2.5 bar, 0.25 MPa)
25 ft. (7.6 m) 38 psi (2.7 bar, 0.27 MPa)
50 ft. (15.3 m) 40 psi (2.8 bar, 0.28 MPa)
75 ft. (22.9 m) 42 psi (2.9 bar, 0.29 MPa)
100 ft. (30.5 m) 45 psi (3.1 bar, 0.31 MPa)
3. Check the voltage output of the gun using a high
voltage probe and meter or by reading the ES (kV)
Display Module.
NOTE: The gun's normal high voltage reading is 60 to
70 kV. If a ball end high voltage measurement probe is
used, the gun voltage will rise to about 85 kV. This will
happen with all resistive electrostatic guns.
See Electrical Troubleshooting on page 25 to cor-
rect voltage problems.
18 308442
Operation

Activating the kV Switch

Apply a minimum of 50 psi (3.5 bar, 0.35 MPa) air
pressure to the kV switch air fitting (KV) to activate it
and switch to the lower voltage setting. The lower
voltage setting is factory set to 60 kilovolts at zero
microamperes. To change this setting, see page 35.
The solenoid valve used to activate the kV switch must
bleed the air out of the line for the switch to draw back
to the higher voltage setting.

Spraying

1. Apply a minimum of 50 psi (3.5 bar, 0.35 MPa) air
pressure to the cylinder air fitting (CYL) to activate
the on/off sequence of atomization air (A1), fan air
(A2), and fluid (P1). Refer to Fig. 13.
2. Turn the gun functions off and on by using the air
solenoid valves on the cylinder (CYL) and turbine
(TA) air supply lines.

Triggering the Fluid Alone

1. Shut off and relieve the air pressure to the atom-
ization (A1) and fan (A2) air lines, using the bleed-
type air shut-off valves.
2. Apply 50 psi (3.5 bar, 0.35 MPa) air pressure to
the cylinder air fitting (CYL) to trigger the fluid.
WARNING
ELECTRIC SHOCK HAZARD
To reduce the risk of an electric shock,
do not touch the gun electrode or come
within 4 inches (101.6 mm) of the nozzle
during gun operation.
WARNING
FIRE AND EXPLOSION HAZARD
If any fluid leakage from the gun is de-
tected, stop spraying immediately!
Fluid leakage into the gun shroud could
cause fire or explosion and result in
serious injury and property damage. See
Check for Fluid Leakage, page 22.