Heidolph LABOROTA 20 compact and safety User Manual
Page 105
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36. Automatic water refill (water bath model only)
The LABOROTA 20 control WB features a automatic water refill system with float switch.
The float switch (1) monitors water level in the heating bath. When dropping below normal level
(about. 30 mm below tank rim), a solenoid valve (12, next para.) opens the water supply until
reaching the normal fill level. Cooling water is supplied to the heating bath via pipe.
The float switch needs to be connected with plug connector (3).
Caution: For technical reasons automatic refill requires the heating bath lift to be at its upper most
position.
Upward lift travel is limited by the float switch. Water control valve on the rear must be connected.
The float switch may fail due to calcareous deposits, causing the hot bath to be overfilled
or overflow. We recommend to decalcify this float switch every 6 months.
To this end uninstall float switch (disconnect plug connector (3) and loosen float switch
(1) attaching screws with a screwdriver.
Use commercial grade decalcifying agent (go by instructions on the pack), and immerse
float switch until fluid level reaches coupling nut. For treatment time refer to instructions
on the pack.
37. Vacuum and water distribution
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