Initial Start Up And Commissioning 5; Water Circulation System; Treating The Heating Water; Heating Side Filling And Bleeding - Vaillant ecoMAX 646 Installation And Maintenance Manual

5 Initial start up and commissioning
Note!
Vaillant offer a commissioning service.If used a
2 year warranty is given, if not only a 1 year
warranty is available
Please note the following whilst commissioning the boiler.
• Remove the cap of the automatic air vent (1 - fig. 5.1)
before filling the heating circuit/storage charging circuit.
• Start the bleeding program for the heating circuit/
storage charging circuit.
5.1

Water circulation system

Detailed recommendations for the water circulation
system are given in BS 6798 and BS 5449: Part 1 (for
small bore and micro bore central heating systems).
Pipework not forming part of the useful heating surface
should be insulated to help prevent heat loss and possi-
ble freezing, particularly where pipes are run through
roof spaces and ventilated underfloor spaces. Draining
points must be located in accessible positions which
permit the draining of the whole system including the
boiler and the hot water system. Draining points should
be at least 1/2 in. BSP nominal size and be in accordance
with BS 2879. The boiler is suitable for use with mini-
bore or microbore systems. Copper tubing to BS 2871:
Part 1 should be used for water carrying pipework. All
capillary joints in all DHW pipework must be made with
lead free solder. Particularly where a new boiler is to be
fitted to an existing system, it is good practice that the
system is thoroughly cleansed.
Important!
To prevent the formation of deposits and
prevent serious damage to the appliance and
system, cleansers must be used carefully and
must be completely removed by thoroughly
flushing the system. Cleansers should only
be left in systems for a maximum of 24 hours.
This cleansing must take place prior to the fitting of the
new boiler and be in accordance with BS 7593. For ad-
vice on the application of system cleansers contact:
Sentinel, Betz Dearborn Ltd. Widnes,
Cheshire, WA8 8UD. Tel: 0151 495 1861 — or
Fernox, Cookson Electronics, Forsyth Road, Sheerwater,
Woking , Surrey GU21 5RZ,01483 793200
5.1.1

Treating the heating water

If you enrich the heating water with frost or corrosion
protection fluid, changes can be caused in the seals and
noises may arise during the heating operation. Vaillant
assumes no liability for this (or for any subsequent
resulting damage).
Please inform the user as to how to go about frost
protection.
Installation and maintenance manual ecoMAX 646 / 0020020158_02

Initial start up and commissioning 5

5.1.2

Heating side filling and bleeding

For the heating system to function perfectly, a water
pressure/filling pressure of between 1.0 and 2.0 bar is
necessary. If the heating system stretches out over
several storeys, higher values for the water level of the
system at the pressure gauge can be necessary (maxi-
mum pressure for safety valve: 3 bar).
Caution!
Filling the system must only be carried using
a proprietary filling loop in domestic applications.
For commercial applications a pressurisation
unit shall be installed.
5.1.3

Final system flush ("Hot")

• Turn on the boiler for central heating and allow the
boiler and system to reach temperature.
• Check that the heating system is watertight.
• Turn the boiler off and rapidly drain both boiler and
system while still hot
• Refill the system and release all air.
• Release water from the system until the system
design pressure of 1.0 bar is attained. (The actual
reading on the pressure gauge should ideally be
0.5 bar plus an additional pressure corresponding to
the highest point of the system above the base of the
boiler – 10 m head equals an additional 1 bar reading
on the pressure gauge. The minimum pressure should
not be less than1 bar in any installation.) If the system
is to be treated with an inhibitor it should be applied
at this stage in accordance with the manufacturer's
instructions. Further information can be obtained
from Sentinel, Betz Dearborn Ltd., Tel: 0151 4951861,
or Fernox, Tel: 01483 793200
• Disconnect the temporary filling connection.
• Refit the boiler casing.
Note!
The venting program ("P.0") runs for approx.
6.5 minutes.
Caution!
For the bleeding of the system, the minimum
pressure must be 1.0 bar.
Do not allow the water pressure to drop below the above
minimum during venting.
• Open the filling cock and tap valve again if necessary.
Caution!
If there is still too much air in the system after
the bleeding program has finished, the program
must be started again.
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