Replacement Of Main Heat Exchanger - Vaillant ecoMAX SERIES Instructions For Installation And Servicing

9.6 Replacement of main heat exchanger

• Turn off boiler.
• Remove front casing.
• Lower control box.
• Drain boiler as previously described.
• Remove burner, gas valve and fan assembly as pre-
viously detailed.
• Disconnect condensate drain by removing spring clip
(4) and pulling condensate drain (5) downwards.
• Disconnect primary flow connection (7) from main
heat exchanger. (A flexible connection has been provided
in the flow pipe to allow easier access to the return
connection. The flow pipe can be carefully eased out
of the way by bending at the flexible connection).
• Disconnect primary return connection (6) from main
heat exchanger.
• Loosen nylon nut at bottom of heat exchanger.
• Slacken the two top securing bolts (8) and rotate
clamps away from heat exchanger.
• Fully remove bottom screw and securing clamp (8).
• Pull heat exchanger forwards to remove from the boiler.
• Drain any residual water from the heat exchanger.
• Reassemble in reverse order.
• Recommission boiler as previously detailed.
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Fig. 9.5 Replacing the main heat exchanger
Instructions for installation and servicing ecoMAX
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Fig. 9.6 Replacing the main heat exchanger
Parts replacement 9
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