Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

Also see for ecoTEC plus 937: Operating manual Operating manual Instructions and maintenance instructions

Contents

ecoTEC plus 937 installation and maintenance manual589 Replacing componentsThe tasks listed below may only be undertaken by aqualified competent heating engineer.• Only use genuine spare parts for repairs.• Check that the parts are correctly fitted and that theoriginal location and alignment is maintained.9.1 Safety instructionsd Danger!Every time components are replaced observethe following safety instructions for your ownsafety and to prevent damage to the unit!Take the appliance out of operation.e Danger!Danger of death by electric shock!Before starting any maintenance work:Isolate the unit from the electrical mains bypulling the plug out of the plug socket (if onlyan isolator switch is available, remove the fusefrom the switch.)• Close the isolation valves in the gas supply and in theheating flow and return pipes.• Close the cold water inlet isolation valve (only oncombi boilers).• Drain the unit if you wish to replace water-conductingcomponents in the unit.• Make sure that no water drips on live electricalcomponents (e.g. electronic box etc.)!• Use only new gaskets and O-rings!• Check the system for gas leaks after completion of thework. Carry out a function test (see Section 7.8).• After all maintenance work and after replacingelectrical components check the earthing, polarity andearth resistance using a multi-meter.9.2 Replacing the burnerd Danger!Before replacing components ensure that thesafety instructions from Section 9.1 areobserved.1Fig. 9.1 Replacing the burner• Dismantle the compact thermo module as describedunder 7.2.1.• Release the 4 screws (1) on burner, and remove theburner.• Mount the new burner with a new gasket. The notch inthe burner must be aligned with the sight glass of theburner.• Fit the compact thermo module as described under7.2.4.• Fit a new burner door seal kit.• After completion of the work check the system for gasleaks and carry out a function test (see Section 7.8).h NoteA new burner door seal kit must be fitted everytime the burner door is removed.9.3 Replacing the fan or gas valved Danger!Before replacing components ensure that thesafety instructions from Section 9.1 areobserved.• Switch the combi boiler off.• Isolate the electrical supply from the combi boiler.• Remove the air intake pipe (Fig. 7.1, Pos. 2).• Loosen the gas supply pipe on the gas valve (Fig. 7.2,Pos. 3).1324Fig. 9.2 Removing the fan with gas fitting9 Replacing components