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

5 Start-up

5 Start-up
Particularly observe the following when putting the boil-
er into service:
• Open the cover of the exhaust fan before filling the
heating circuit/storage charging circuit.
• Start the bleeding program for the heating circuit/stor-
age charging circuit.
5.1

Water circulation system

Detailed recommendations for the water circulation sys-
tem 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 possible freezing,
particularly where pipes are run through roof spaces
and ventilated underfloor spaces. Draining taps must be
located in accessible positions which permit the draining
of the whole system including the boiler and the hot
water system. Draining taps should be at least 1/2 in.
BSP nominal size and be in accordance with BS 2879.
The boiler is suitable for use with minibore 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. Par-
ticularly 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 pre-
vent serious damage to the appliance and sys-
tem, 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, Alpha Fry Technologies, Tandem House,
Marlow Way, Croydon, CR0 4XS. Tel: 0870 6015000
5.1.1

Treating the heating water

Caution!
Do not enrich the heating water with frost or
corrosion protection fluid.
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 re-
sulting damage).
Please inform the user as to how to go about frost pro-
tection.
18
Caution!
Softening the heating water when water hard-
ness is 20° dH or more is absolutely necessary.
To do this, you can use the water softening cartridge,
item no. 30 13 63. Please observe the instructions sup-
plied with it.
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 sev-
eral storeys, higher values for the water level of the sys-
tem at the pressure gauge can be necessary (maximum
pressure for safety valve: 3 bar).
Caution!
Only fill the system via the appliance-internal
KFE cock. Otherwise bleeding problems may
arise.
• Rinse the heating system thoroughly before filling it
proper.
• Open the cap of the appliance-internal exhaust fan (1)
(fig. 5.1).
• Open all thermostat valves in the system.
• Connect the system's filling and draining cock to the
appliance return via a hose.
• Slowly unscrew the filling cock and tap valve und fill
with water until the required system pressure at the
pressure gauge (2) has been reached (at least 1 bar).
• Close the tap valve.
• Bleed all radiators.
• Then check the filling pressure of the system again
(and repeat filling procedure if necessary).
• Start the "P.O" bleeding program (see chapter 8.1.5).
Note!
The bleeding program runs for approx. 6.5 min-
utes.
Caution!
For the bleeding of the system, the minimum
pressure must be 0.8 bar.
If pressure is too low, the gas valve jams when the burn-
er starts up.
• 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 anew.
Installation and maintenance manual ecoMAX 646