3
Flushing
Use this procedure when changing color, and before
shutting down the system for the night or for extended
periods.
1. Remove the cup assembly. Refer to
Removing
and Installing the Cup Assembly and Nozzle
.
2. Turn on the system compressed air and electrical
power.
3. Start the spray-booth exhaust fan.
4. Supply a solvent or cleaning solution compatible
with your coating material to the trigger valve.
NOTE:
If the cup assembly is installed on the turbine,
turn on turbine air before triggering the valve. The
turbine should be rotating to prevent solvent from
possibly backing up behind the cup and flowing into
the turbine.
5. Trigger the valve and let the solvent or cleaning
solution flow through the RA-20R rotary atomizer
for several seconds.
6. If you are changing coatings, supply the new
coating material to the trigger valve. Trigger the
valve until the coating material flushes out the
solvent or cleaning solution.
Removing and Installing the
Cup Assembly and Nozzle
Follow this procedure to remove and install the cup
assembly and nozzle.
WARNING:
Shut off the turbine air, turn off
the electrostatic voltage, and relieve the fluid
pressure before you perform the following
tasks. Failure to observe this warning may
result in equipment damage, personal injury,
or even death.
1
/
8
-in. hex-key ball
driver (2), supplied with the RA-20R rotary
atomizer, through the hole and duckbill seal in the
side of the charge ring (1).
2. Rotate the cup (4) and push on the driver until it
drops into the hole in the turbine shaft.
3. Hold the driver and turn the cup counterclockwise
(as viewed from the front) to unscrew it from the
turbine shaft.
4. Unscrew the nozzle (5) from the end of the fluid
tube.
5. Make sure the new nozzle has an O-ring (6)
installed on it. Thread the new nozzle into the fluid
tube and tighten it finger-tight.
6. Insert the
5
/
16
-in. hex key, supplied with the
RA-20R rotary atomizer, through the back of the
cup and into the distributor (3). Turn the hex key
counterclockwise (as viewed from the back of the
cup) to unscrew the distributor from the cup.
To reassemble the cup and install it on the turbine,
perform the preceding steps in reverse. Note that the
distributor has left-hand (reverse) threads.
3
4
2
1
5
6
Figure 1 Cup assembly and nozzle replacement
1. Charge ring
2. Ball driver
3. Distributor
4. Cup
5. Nozzle
6. O-ring
Maintenance
To keep your system operating at peak efficiency, set
up a scheduled maintenance program. Keep the
spray area clean and orderly at all times.
Daily
S
Clean the cup and distributor.
S
Flush the system.
S
Wipe any overspray off the atomizer.
S
Make sure the compressed air supply is free of oil
and water.
S
Drain the air filters and check the filter elements.
Replace the elements if the pressure drop across
the filters exceeds 0.3–1 bar (5–15 psi), or if they
become contaminated by oil.