Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

Also see for ecoTEC plus 937: Operating manual Instructions for installation and servicing Operating manual

Contents

23Installation and maintenance instructions ecoTEC plus 0020031552_03h NoteBefore connecting the heating circuit to thecombi boiler all pipework and radiators mustbe thoroughly flushed out to remove all con-taminants.1011 1213987612345Fig. 4.9 Flow and return heating connections• Remove the stop valves with union nuts, olives andfibre seals from the box of accessories for the combiboiler.• Insert the fibre seal (1) and screw the stop valve (2)onto the return pipe connection on the combi boiler.• Insert the fibre seal (10) and screw the stop valve (9)with the fitted flexible hose (13) onto the flow connec-tion of the combi boiler.• Fit the O-ring seal (12) to the non-return valve (11).h NoteLay the filling loop hose (13) above the pipe-work elbows.• Push the union nuts (4) and (7) with olives (3) and (8)onto the pre-shaped 22 mm pipes (5) and (6).• Push the pipes (5) and (6) into the stop valves up tothe stop. Tighten the union nuts in this position.• Fit the handle for the filling loop to the cold waterstop valve (9) with a countersunk screw.a Caution!Please note that, when fitting a low loss headerthe diameter of the connection lines betweenthe unit and the diverter must not be greaterthan 22 mm.Ø max. 22 mmFig. 4.10 Diameter of the connection lines when using a lowloss header4.15 Condensate drainThe combi boiler is equipped with a condensate siphon.(The filling height is 145 mm.) The siphon collects thecondensate in a vessel with a capacity of approx. 200 mland feeds the entire contents to the drain pipe. Thisminimises the risk of the drain pipe freezing up.127dc65a343bFig. 4.11 Installing the condensate drain• Connect the condensate drain (1) of the boiler toa condensate drain pipe (2) which has a minimuminternal diameter of 19 mm (22 mm outside diameterfor all external pipes) and which is made from anacid-resistant material (e.g. plastic overflow pipe).h NoteThe accessories for the storage tank include acorrugated hose for draining the condensate.Sequence of operations during installation 4