Vaillant ecoTEC plus 937 Service Manual download pdf (Page 29)

Installation and maintenance instructions ecoTEC plus 937 0020031552_06 29

5.14 Connecting the heating supply and return

lines

Danger!

Risk of scalding and damage due to leaking

water.

Possible leaks in water pipes.

Make sure there is no tension in the supply

lines when they are installed.

Caution!

Risk of damage to service valves caused by

heat transfer.

If the final connections are soldered, the heat

transferred during the process may damage

the service valves.

Use extra care when soldering.

Caution!

Risk of damage to the appliance.

Residue in the pipes, such as welding beads,

scale, hemp, putty, rust and coarse dirt, may

be deposited in the appliance and cause mal-

functions.

Flush the heating system thoroughly

before connecting the appliance in order to

remove any possible residue.

Fig. 5.9 Flow and return heating connections

Remove the stop valves with union nuts, olives and

fibre seals from the box of accessories for the combi

boiler.

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 con-

nection of the combi boiler.

Fit the O-ring seal (12) to the non-return valve (11).

Lay 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 to

the stop. Tighten the union nuts in this position.

Fit the handle for the filling loop to the cold water

stop valve (9) with a countersunk screw.

Please note that, when fitting a low loss

header the diameter of the connection lines

between the unit and the diverter must not

be greater than 22 mm.

Ø max. 22 mm

Fig. 5.10 Diameter of the connection lines when using a low

loss header

Sequence of operations during installation 5

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 29

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