Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual

Also see for ecoTEC VU 466/4: Installation manual Operating manual

Contents

Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual Manual pdf 50 page image

Installation and maintenance instructions ecoTEC 0020029172_03501234Fig. 10.2 Dismantling the fan with gas valve• Pull the plug (4) out of the gas valve.• Pull the plugs (2) out of the fan.• Unfasten the four screws (3) on the compact thermalmodule (1).• Remove the complete unit "gas valve/fan".56Fig. 10.3 Screwed connection gas valve/fan• Release both fixing screws (5) on the gas valve andremove the fan from the gas valve.• Replace the defective component.a Caution!The gas valve and fan must be returned to theirprevious installation position. Use a new seal!• Screw the fan to the gas valve. Use new seals.• Re-install the complete "gas valve/fan" boiler in thereverse sequence.• After completing the work, perform a gas-tightnesscheck and function check (see Chapter 8.10)10.4 Replacing the heat exchangerd Danger!Before replacing the component, observe thesafety information in Chapter 10.1.• Disconnect the boiler from the power mains asdescribed in Chapter 10.1, and close the gas isolationvalve.• Close the service valves in the heating flow and returnand drain the boiler.• Dismount the compact thermal module as describedunder 8.3.1.14523Fig. 10.4 Replacing the heat exchanger• Pull out the clip (4) of the condensate siphon (5).• Unfasten the screw connections on the condensatesiphon and pull it off the heat exchanger.• Disconnect the flow connection (2) and the returnconnection (1) on the heat exchanger.• Slacken the white plastic nut between the siphon andheat exchanger.• Unfasten the three screws (3) on the heat exchangerand take it out of the boiler.• Unfasten both brass connection pieces (positions 1and 2) on the old heat exchanger and screw theseonto the new one. Use new seals in the process!• Mount the new heat exchanger in reverse order andreplace the seals.• Fill and bleed the boiler, also, if necessary, the systemafter installing the new heat exchanger.• After completing the work, check for gas and waterleaks and perform a function check (see Chapter 6.4).10 Replacing components