BARTEC BENKE HYGROPHIL H 4230-12 Ex Zone II, Operating Instructions Manual, Page: 90 / 112

Maintenance
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Operating Instructions HYGROPHIL® H 4230-12 BA 060207
6.11 Replacing the electronics board
 To replace the electronics board you must first dismount the display-/
profibus-board. Follow the instructions according to section 6.10 to this.
To avoid mistakes when reassembling you should note the positions of all
connections or mark them distinctive.

Disconnect all cables and connectors.
 Disconnect the three pressure hoses carefully.

Unscrew the seven attachment bolts.
Attention! Do not unscrew the black plastics bolt in the bottom right
corner. It fixes components behind the board.
 Take the board carefully out and insert the replacement board.

Fix the board with the four screws and reconnect all cable connections.
Do not unscrew !
PT 100 internal
Water pump
Proportional valve
PT 100 TT
PT 100 HT
Water sensor