Cold Water Supply And Hot Water Outlet; Piping Between Shift Load Storage Tank And Combination Boiler; Flow And Return Heating Connections - Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

4 Sequence of operations during installation
• 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.
h Note
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-detecting
spray.
4.12

Cold water supply and hot water outlet

Caution!
a
Ensure stress-free assembly of the connection
pipework to avoid leakages!
Caution!
Danger of damage to the gas isolator valves by
heat transfer!
If the final connections to the combi boiler are
made using soldered pipe connections, you
must be particularly careful not to damage the
gas isolator valves by heat transfer.
Fig. 4.7 Installing the cold water and hot water connections
h Note
Flush all foreign matter from the mains supply
before connecting to the appliance.
• Remove the two copper tails (5, 6) for water connection,
the cold water isolating valve (2) and the union nut
(4), olive (3) and fibre seals (1, 7) from the packaging.
22
7
6
1
2
3
4
5
• 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.
• Push the union nut (4) with the inserted olive (3) onto
the copper tail (5) included with the combi boiler. The
diameter of this pipe is 15 mm.
• Insert the copper tail into the cold water isolating valve
up to the stop. Tighten the union nuts in this position.
• Insert the fibre seal (7) and screw the copper tail (6)
which is included with the storage tank module, to the
hot water connection on the unit. The diameter of this
pipe is 15 mm.
• Fit the handle for the filling loop to the cold water
stop valve (2) with a countersunk screw.
4.13 Piping between shift load storage tank and
combination boiler
1
3
Fig 4.8 Piping between shift load storage tank and combina-
tion boiler
• Remove the pipe sections (1), (2), (3) and (4) with the
associated fibre seals from the box of accessories of
the shift load storage tank.
• Fit the formed pipe and straight pipe sections in the
correct sequence.
h Note
The formed pipes (1) and (2) must be fitted first.
4.14

Flow and return heating connections

a Caution!
Ensure stress-free assembly of the connection
pipework to avoid leakages!
a Caution!
Danger of damage to the stop valves by heat
transfer!
If the final connections to the combi boiler
are made using soldered pipe connections, you
must be particularly careful not to damage the
stop valves by heat transfer.
Installation and maintenance instructions ecoTEC plus 0020031552_03
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