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Cod. 3541T090 - Rev. 00 - 06/2019

MAINTENANCE

Boiler - Circulating pump

ABefore carrying out the following instructions it is advisable to protect the room and the boiler’s electrical box against accidental water spillage.

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fig. 186 - Circulator replacement / maintenance

• Disconnect the power supply and turn off the gas cock ahead of the valve.

• Electrically disconnect the circulating pump, releasing the connections by raising the detail “1” of fig. 186.

• Drain the water in the boiler (see “15.5 System draining” on page 89)).

• Unscrew and remove the circulating pump motor assembly (“4” di fig. 186).

Boiler - Replacing the main exchanger

ABefore carrying out the following instructions it is advisable to protect the room and the boiler’s electrical box against accidental water spillage.

fig. 187 - Main exchange

• Disconnect the power supply and close the gas cock ahead of the valve

• Disconnect the fume sensor connector

• Disconnect the fan connector

• Disconnect the connector of the ignition electrode connected to the board.

• Drain the water from the indoor unit. (see “15.5 System draining” on page 89).

• Extract the flue connection (concentric or accessory for separate ducts)

• Remove the fan

• Remove the clips of the two pipes on the exchanger, pump and hydraulic unit

• Remove the 2 top screws “5” securing the exchanger to the frame (fig. 187)

• Loosen the 2 bottom screws “5” securing the exchanger to the frame (fig. 187)

• Remove the exchanger