Vaillant ecoTEC plus 937 Service Manual download pdf (Page 27)

Installation and maintenance instructions ecoTEC plus 937 0020031552_06 27

Fig. 5.6 Gas connection

Proceed as follows for gas connection:

Remove the gas connection pipe elbow (2) and gas

isolator valve (1) from the packaging.

Push the union nut (3) and the olive (4) onto the gas

pipe which protrudes from the combi boiler.

Push the gas isolator valve (1) onto the gas pipe

which protrudes from the combi boiler up to the stop.

Pull the union nut (3) with the olive (4) towards the

gas isolator valve. Tighten the union nut hand tight.

Push the union nut (6) and the olive (5) onto the gas

connection pipe elbow (2).

Push the gas connection pipe elbow (2) into the gas

isolator valve (1) up to the stop.

Pull the union nut (6) with the olive (5) towards the

gas isolator valve. Tighten the union nut hand tight.

The diameter of the pre-formed copper pipe (2) is

22 mm. Connect this pipe to a gas supply pipe having

a diameter of not less than 22 mm.

The gas supply pipework must be of sufficient

size so that, at maximum output, a gas pres-

sure of 20 mbar is available at the input to

the combi boiler.

Tighten all connections.

Purge the gas pipe before commissioning.

Check the gas connection for leaks using leak-detect-

ing spray.

5.12 Connecting the hot and cold water

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 gas shut-off valves

caused by heat transfer.

If the final connections are soldered, the heat

transferred during the process may damage

the gas shut-off 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 cold water inlet pipe thoroughly

before connecting the appliance in order to

remove any residue that may be there.

Fig. 5.7 Installing the cold water and hot water connections

Remove the two copper tails (5, 6) for water connec-

tion, the cold water isolating valve (2) and the union

nut (4), olive (3) and fibre seals (1, 7) from the pack-

aging.

Insert the fibre seal (1) and screw the cold water iso-

lating valve (2) to the cold water connection of the

shift load storage tank.

Sequence of operations during installation 5

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 27

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