Troubleshooting Guide - Renfert Basic master Instrucciones Para El Servicio

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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
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2946

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