Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

Also see for ecoTEC sustain 24: Operating instructions Installation and maintenance instructions

0020253094_05 ecoTEC sustain Installation and maintenance instructions 4112. Refit the entire fan/gas valve assembly unit in reverseorder. You must use a new seal (5) for this.13. Ensure that the order in which the three screws arescrewed in between the fan and the mixture pipe cor-responds to the numbering (3), (2) and (4).14. Tighten the union nut (2) on the gas valve assemblyand the union nut (8) between the gas pipes. In theprocess, secure the gas pipe against twisting. Use newseals for this.15. After you have completed this work, carry out a leak-tightness test (function check). (→ Page 32)16. If you have installed a new gas valve assembly, adjustthe gas setting. (→ Page 36)13.7.3 Replacing the heat exchanger1. Drain the product. (→ Page 39)2. Detach the condensate discharge hose from the heatexchanger.3213. Remove the clamps (2) and (3) from the area of theflow and return connection.4. Disconnect the flow connection.5. Disconnect the return connection.6. Remove both screws (1) from both brackets.217. Remove the lower three screws (2) on the rear sectionof the retainer.8. Move the bracket round to the opposite side and attachthe upper screw (1) to the side.9. Pull the heat exchanger downwards and to the right,and remove it from the product.10. Install the new heat exchanger in reverse order.11. Replace the seals.NoteInstead of grease, use only water or com-mercially available soft soap to aid installa-tion.12. Insert the flow and return connections into the heatexchanger as far as they will go.13. Ensure that the clamps are correctly fitted to the flowand return connections.14. Fill and purge the unit and, if required, the heating in-stallation. (→ Page 29)13.7.4 Replacing the expansion vessel14231. Prepare the repair work. (→ Page 40)2. Undo the screwed connection (4).3. Remove both screws (1) on the support plate (2).4. Remove the support plate (2).5. Pull out the expansion vessel (3) towards the front.6. Insert the new expansion vessel into the product.7. Screw the new expansion vessel to the water connec-tion. Use a new seal for this.8. Attach the support plate using both screws (1).9. Fill and purge the product and, if required, the heatinginstallation (→ Page 29).10. If necessary, adjust the pressure to the static height ofthe heating installation.11. Complete the repair work. (→ Page 43)