Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

Also see for ecoTEC VU 656/4: Installation manual Operating manual

Contents

Installation and maintenance instructions ecoTEC 0020029173_0140H Danger!Danger of combustion and damage due toescaping hot flue gases!The silicone seal and the silicate cord on thecompact thermal module (No. 180904) must bereplaced at every maintenance operation. Theinsulating layer on the burner door(No. 180913) must not exhibit any signs ofdamage; otherwise it must also be replaced(see Chap. 8.3.4).8.3.2 Cleaning the heat exchangera Caution!Danger of short-circuiting and irrepairabledamage to the PCB and fan!Protect the downfolded electronic box and alsothe fan against splash water.12Fig. 8.3 Cleaning the heat exchanger• Dismount the compact thermal module as describedunder 8.3.1.• Clean the heating coil (2) of the heat exchanger (3)using commercially-available essence of vinegar. Flushwith water. The water flows out of the heat exchangerthrough the condensate siphon. You can also cleanthe condensate trap via the opening (4).• Allow the cleaning agent to take effect forapproximately 20 minutes then rinse off the loosedirt. To clean the coils you can use a brush withsynthetic bristles, but no aids with metallic or similarmaterials. Avoid getting large amounts of waterdirectly on the insulating mat at the back wall of theheat exchanger. Otherwise the insulating mat can bedamaged.8.3.3 Checking the burnerThe burner is maintenance-free and needs no cleaning.• Check the surface of the burner for damage, replacethe burner if necessary.• After checking/repairing the burner install thecompact thermal module as described in Chap. 8.3.4.8.3.4 Installing the compact thermal module1231 2Fig. 8.4 Replacing the seals and the insulating layer on theburner doorH Danger!Danger of combustion and damage due toescaping hot flue gases!The silicone seal and the silicate cord on thecompact thermal module (No. 180904) must bereplaced at every maintenance operation. Theinsulating layer on the burner door(No. 180913) must not exhibit any signs ofdamage; otherwise it must also be replaced.8 Inspection and maintenance