Commissioning (Part I) 5; Preliminaries - All Systems; Gas Supply - Vaillant ecoTEC plus Instructions For Installation And Servicing

5 Commissioning (Part I)
Please ensure the "Benchmark" commissioning check
list is completed and left with the user.
5.1

Preliminaries - all systems

A competent person approved at the time by the Health
and Safety Executive should carry out commissioning, in
accordance with the current issue of BS 6798.
• Remove the two screws on the inner case then lift the
case upwards off the two top retaining dowels.
• Drop down the electronics box into the service position.
• Remove the four screws from the chassis panel.
• Remove the chassis panel by pulling it out at the top
from its retaining slots, see fig 5.1.
flue gas analysis point
combustion air
analysis point
retaining dowel (2 off)
inner case
screw (2 off)
chassis panel
screw (4 off)
electronic box
Fig. 5.1 Inner case and chassis removeal
h Note!
When replacing chassis panel ensure the bot-
tom fits behind lip.
• Make sure that the system has been thoroughly flushed
out with cold water, prior to filling the system refer to
section 3.16 inhibitor cleaning.
• Refill the system with water, making sure that all the
air is properly vented from the system and pump.
5.1.1

Gas supply

• Isolate the boiler from the mains electrical supply. The
complete gas installation including the gas meter must
be isolated, tested for soundness and purged in accor-
dance with BS 6891, in IE the current edition of IS 813.
Instructions for installation and servicing ecoTEC plus 0020020828_07

Commissioning (Part I) 5

The gas supply to the boiler can be purged by slackening
the union connection on the gas service valve beneath
the boiler, see fig 5.2. Ensure that there is adequate
ventilation, extinguish all naked flames and do not
smoke whilst purging.
gas service valve
union connection
Fig. 5.2 Gas service valve
After purging, the gas service union connection must be
re tightened and tested for soundness. (The boiler itself
does not require purging as this will be done by the auto-
matic burner sequence control). The gas valve is factory
set for natural gas (G20) and should need no adjustment.
The supply pressure should be checked when the boiler
is firing at full rate. Check the inlet pressure at the
pressure test point on the gas valve shown in fig 5.3 the
values should be between those shown below.
offset adjustment
gas control valve
Fig. 5.3 Gas control valve
LPG:
a
Do not proceed with the adjustment or attempt
to put the unit into service if the inlet working
pressure is lower than 34 mbar.
a Caution!
Before operating the boiler check the type plate
and ensure that the correct gas type appliance
has been installed.
off
on
throttle
electrical plug
pressure test point
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