WDT Operating instructions GRANUDOS 10 (V61-08/05) page 14 of 20
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L1 on continuously: Water level in flushing tank too high, suction too low
There is coming more water to the tank as is sucked through by the venturi.
1. Suction power of venturi is O.K.: switch bobbin of flow switch in suction tube is at top of tube.
By pressing the supply hose to the suction tube the bobbin goes down and switch LED burns.
If loosened again, bobbin goes up quickly and switch LED goes out.
In this case there should be a fault in the floating valve: check whether by moving the floater
slowly up and down the incoming water flow decreases or increases steadily. If so adjust water
level by turning the floater rod one turn right. If floating valve does not work steadily, fit a new
valve membrane.
2. Suction power of venturi is not enough: switch bobbin of flow switch in suction tube is at
bottom of tube. By pressing the connecting hose to the suction tube the bobbin does not move,
switch LED burns.
Possibilities:
-
at installation: service pressure too low – counter pressure too high. tubing faulty or too
small: take out orifice washer (13c) from union behind venturi.
- Booster pump performance too low – see pressure limits at para “Installation – piping”.
Fit the supplied pressure gauge to inlet and outlet to check pressure situation.
- Particles inside venturi or at outlet nozzle of flushing tank (good possibility at installation)
- Suction tube and/or mixing cyclone are turbid by calcium: acid dosing too low:
if there is still a little suction this can be easily cleaned by pouring hydrochloric acid or
special cleaning chemical into suction cone of the tank.
After cleaning increase acid dosing performance.
L2 on continuously: Water level in tank too low
Suction power of venturi is higher than water is supplied.
Possibilities:
- suction power too high: fit an orifice washer (13c) of 5,5 mm inside union behind venturi.
- supply water tubing is blocked
- too low supply pressure
- floating valve cone into flushing tank is blocked by particles, diaphragm is faulty
