Jungheinrich ESD 220 Operating Instructions Manual page 182

NOTE
If an installed electrolyte circulation system is seldom used or not used at all, or if the
battery is subjected to severe temperature fluctuations, the electrolyte may flow back
into the hose system.
Attach a separate coupling system to the air inlet line, such as: locking coupling
to the battery side and through-coupling to the air supply side.
Schematic illustration
Electrolyte circulation on the battery and air supply via the charger.
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