VITODENS 200 WB2A - Heatingspares247.com

9 Replacement of Parts9.1 Heat Exchangerk) Remove the siphon connecting pipe from the bottom of the heat exchangertogether with its bulkhead seal.l) Remove the retaining clips from the return connection of the heat exchangerand above the lower right hand bulkhead and remove the return pipe.m) Support the flue system above the flue connection collar.n) Remove the screws and clamps retaining the flue connection collar andremove the collar.o) Unscrew the automatic air vent from its sea behind the flue collar.p) Slackenthe four M6 nuts securing the heat exchanger rear brackets, slide the heatexchanger upwards to release it from the keyhole slots and remove in aforward direction.q) Replace the heat exchanger and assemble in reverse order ensuring that alljoints and seals are correctly made.r) Connect the filling loop, open the CH flow and return valves and re-pressurisethe system to design pressure using the filling loop valves and venting asnecessary. Check all connections for soundness, then disconnect the fillingloop. Finally, ensure that the outer casing is secured in position and carry out acombustion check as in 5.4.9.2 Fan Assemblya) Gain access by removing the burner assembly as described in section 9.1,steps (b) to (g).b) Separate the fan/gas valve assembly from the burner by removing the two6mm socket head screws.c) Separate the fan from the venturi/gas valve assembly by removing the two5mm screws taking care not to damage the gasket.d) Replace the fan and reassemble in reverse order.e) Finally, ensure that the outer casing is secured in position and carry out acombustion check as in 5.6.54