Troubleshooting Guide - Renfert Basic master Instrucciones Para El Servicio

15. Troubleshooting Guide

Problem
No air and no •
abrasive.
•
•
Only air, no or •
very little abra-
sive.
•
•
Unit blasts con- •
tinuously.
•
Possible cause
Blasting nozzle blocked at
the hand-piece.
Foot switch connecting
lines kinked.
Switch set to an intermedi-
ate position (only on the
2-tanks version).
The dosage nozzle in the
mixing chamber is blocked
due to contaminated or
moist sand.
Mixing chamber filter com-
bination blocked.
Abrasive contains impuri-
ties or is moist.
Foot switch connected
incorrectly.
Valve in foot switch is
defective.
Corrective action
• Unscrew the nozzle from the hand-piece and blow it out.
• With the nozzle removed, blow out the blasting hose by acti-
vating the foot pedal.
• Inspect/correct the connection lines.
• Turn the switch until you feel it click into place.
• Wear protective goggles.
• Unscrew tank lid.
• Remove sand.
• Close the uptake tube (blue tube) in the tank (by bending), so
that no air can escape.
• Hold the sandblasting nozzle on the handpiece closed with
the other hand.
• Using a setting of 4 to 6 bar pressure, activate the foot switch
repeatedly in succession.
• Before re-filling with sand, check the tank and sandblasting
material for contamination or moisture. If necessary replace
with new sand.
• Re-fill with sand and secure the tank lid. (Continue sandblast-
ing in the usual manner).
Install new filter sets:
- Part no. 90002-8889
- Part no. 90002-8888
(Refer to the insert for the appropriate filter set):
• Disconnect the compressed air supply to the mixing chamber.
• Unscrew the plug-in connection.
• Remove the old filter sets.
• Run a thin (1 mm) wire through the opening in the mixing
chamber.
• Install new filter sets as follows (number of components ac-
cording to the filter set– smooth (colour marked) side facing
the mixing chamber):
1. Screen
2. Filter, thin
3. Filter, thick
4. Screen
5. Spacer
Reinstall the screw-on connections in the reverse order.
Make certain their is no abrasive residue on the threads.
Attention: Never operate the unit without filters!
Do not reinstall used filter sets!
• Replace the abrasive.
• Inspect/correct the foot switch connection.
• Replace foot switch.
- 17 -
25-70 µm
70-500 µm
EN