Ferroli BLUEHELIX TECH RRT 34 C Manual page 36

Replacing the main exchanger
Before carrying out the following instructions it is advisable to protect the area and the boiler's PCB housing
A
against accidental water spillage.
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• Isolate the power supply and close the Gas isolation valve to the boiler.
• Disconnect the lead to the flue temperature sensor, Remove the sensor & save (Please fit this into the replacement
exchanger housing in readiness).
• Disconnect the fan power lead.
• Disconnect the white lead to the ignition electrode from the Printed Circuit board, & release the earth tag.
• Remove the ignition electrode (2 x T15 Torx screws) Take care not to damage the gasket, replace if damaged.
• Close ALL the isolation valves to the boiler & drain both the heating & hot water circuits down.
• Remove the appliance flue connection (concentric or adaptor for separate ducts)
• Remove the fan assembly (2 x 4mm Allen key bolts) Take care not to damage the cork gasket, replace if damaged.
• Remove the 4 x spring clips "1" on the two pipes "2" to the exchanger, pump and hydraulic unit & lift away.
• Remove the flexible connection from the top of the condense trap "4"
• Remove the burner assembly (fig. 43) Remove the fan diaphragm & install into the new exchanger.
• Release the clamp to the flexible gas connection (Save & re-use later)
• Remove the 2 top screws "5" securing the exchanger to the frame (fig. 42)
• Loosen the 2 bottom screws "5" securing the exchanger to the frame (fig. 42)
• Remove the exchanger from the boiler casing (take care not to spill any remaining water) "6"
• Slot the new exchanger onto the bottom screws "5"
• Refit the Ignition electrode, Burner assembly, Fan, Condense connection, Flexible Gas connection & any removed
electrical connections
• Fit the supplied 'O' rings to the flow & return pipes, lubricate with silicone grease (not supplied) then re-fit the pipes
& spring clips.
• Open all isolation valves to re-fill the boiler, purge out the air, re-establish the power & test (Please follow GSIUR
26/9)
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fig. 42- Main exchanger
cod. 3541O990 - Rev. 01 - 07/2018
BLUEHELIX TECH RRT 34 C
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5
5
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5
5
EN