Halstead BFF40 Instructions For Use Installation And Servicing

Contents

Halstead BFF40 Instructions For Use Installation And Servicing Manual pdf 26 page image

262000225095B10 Replacement of PartsIMPORTANT NOTESREMEMBER, When replacing a part on this appliance, use onlyspare parts that you can be assured conform to the safety andperformance specification that we require. Do not usereconditioned or copy parts that have not been clearly authorisedby Halstead Boilers Ltd.Replacement of parts must only be carried out by a competentperson.Before removing or replacing any parts, turn off the gas supplyat the gas service cock, see diagram 8.2 and isolate theelectrical supply to the appliance.Unless stated otherwise, all parts are replaced in the reverseorder to removal.After replacing any parts always test for gas soundness and ifnecessary carry out functional check of controls.10.1 Electrical ThermistorRemove front panel to gain access, see section 6.8.Remove control box cover by undoing the four securing screws(two on control box, two on the heat shield) and lift off, seediagram 10.1.Remove thermistor lead from retaining clip, located on thecontrol box support bracket, see diagram 8.3.Release strain relief grommet securing thermistor lead at theside of control box.Disconnect the thermistor electrical plug from the control board(P.C.B) slightly bending back the retaining latch to allowwithdrawal, see diagram 10.2.Remove the retaining wire and withdraw the electrical thermistorfrom its phial, see diagram 10.3.Draw the thermistor lead followed by the thermistor out thoughthe control box case.Re-assembly note. When fitting the thermistor make sure it isfully inserted into the phial, see diagram 10.3. Take care whenre-threading retaining wire so as not to damage thermistor.10.2 Control Board (P.C.B)Remove front panel to gain access, see section 6.8.Remove control box lid by undoing the four securing screws(two on control box, two on the heat shield) and lift off, seediagram 10.1.CONTROLBOXCOVERCONTROLBOXSECURINGSCREWSTERMINALBLOCKDiagram 10.19905ELECTRICAL PLUGS Diagram 10.2PCBDiagram 10.3PHIALPOCKETTHERMISTORBOILERTEMPERATURECONTROLCarefully pull the boiler temperature control knob away from theP.C.B.Disconnect the electrical plugs from the control board (PCB)slightly bending back the retaining latches to allow withdrawal,see diagram 10.2.Disconnect the ignition lead.Carefully pull the board away from its supports bending backslightly the retaining latches.When refitting refer to wiring diagram 9.4.Take care when replacing the burner temperature control knobby supporting the potentiometer on the P.C.B.10.3 ElectrodeRemove front panel to gain access, see section 6.8.Refer to the relevant paragraphs of the servicing section toremove the burner from combustion chamber.To remove the electrode, unscrew from the retaining bracket,see diagram 8.12.Take the electrode out from below and remove the ignition lead.When removing and replacing the electrode take care not todamage it.When refitting, check spark gap, see diagram 8.12.10.4 Multifunctional ControlRemove front panel to gain access, see section 6.8.Disconnect the electrical plug, see diagram 10.4.Disconnect the gas cock, on the left hand side.Support the multifunctional control, remove the four screws (2long, 2 short) from the flanged connection at the right hand side.Remove and discard the original “O” ring from the flangedconnection and fit the new “O” ring supplied, into recess, beforefitting the replacement multifunctional control.After assembly test for gas soundness and purge in accordancewith the current issue of BS6891.

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