Technical data

13Installation and maintenance instructions ecoTEC exclusive 0020017768_05
Fig. 5.1 Gas connection
The Vaillant ecoTEC exclusive is supplied for use with
natural gas G20 and can only be converted to the use
of propane gas G31 by the Vaillant service engineer or
a suitably qualified installer approved at the time by the
Health and Safety Executive.
The gas connection is to be via 20 mm Ø steel piping.
The dynamic gas connection pressure must be at least
19 – 23 mbar for natural gas and 37 mbar for propane
gas.
• The gas pipe should first be cleaned by blowing out
with compressed air. This prevents damage to the
appliance.
• Connect the compression gas service cock and 15 mm
copper outlet tail as supplied with the appliance and
tighten.
• Connect a gas supply pipe of not less than 15 mm
diameter to the copper tail.
• Tighten all connections.
(Ensure the gas supply pipework is adequately sized
such that a 20 mbar gas pressure is available at the
boiler inlet at full flow rate).
5.3 Hot water and cold water connections
2
4
2
3
1
5
Fig. 5.2 Hot water and cold water connection
a
Caution!
Mount the hot water and cold water lines so
they are tension-free, this prevents leaks!
Flush all foreign matter from the mains supply before
connecting to the boiler.
• Connect the cold water service valve (1) to the cold
inlet water connection of the appliance with the
washer provided and tighten.
• Connect a 15 mm cold water inlet copper pipe (3) to
the cold water service valve (1) and tighten.
• Connect a 15 mm hot water outlet pipe (4) to the
outlet connection (5) of the appliance.
The Vaillant ecoTEC exclusive is set in the factory to a
nominal water quantity of 11.6 l/min. (38 kW unit) and
9.8 l/min. (32 kW unit).
Installation 5