Commissioning; Preliminaries - All Systems; Sealed Systems; Gas Supply - Vaillant ecoMAX pro Instructions For Use Installation And Servicing

13 Commissioning

13 Commissioning

13.1 Preliminaries - All Systems

A competent person in accordance with the current
issue of BS 6798 should carry out commissioning.
Preliminary electrical checks
Check the electrical installation by carrying out short
circuit, earth continuity and resistance to earth tests
and a check for correct polarity.
Make sure that the system has been thoroughly flushed
out with cold water.
Refill the system with water, making sure that all the air
is properly vented from the system and pump, Fig. 13.1
shows vent point.
Before operating the boiler check that all external con-
trols are calling for heat.
OVERHEAT
FLOW
THERMOSTAT
THERMISTOR
RETURN
THERMISTOR
Fig. 13.1

13.2 Sealed Systems

Fill the system until the pressure gauge registers the
recommended pressure. Clear any air locks and check
for leaks.
Check the operation of the safety valve, preferably by
allowing the water pressure to rise until the valve lifts.
This should be within ± 0.14 bar, of the preset pressure.
Where this is not possible a manual check should be
carried out.
Release the cold water to the initial design pressure.
20

13.3 Gas supply

Isolate the boiler from the mains electrical supply.
The complete gas installation including the gas meter
must be inspected, tested for soundness and purged in
accordance with BS 6891.
The gas supply to the boiler can be purged by
slackening the gas service valve beneath the boiler.
Ensure that there is adequate ventilation, extinguish all
naked flames and do not smoke whilst purging.
After purging, the gas service valve connection must be
retightened and tested for soundness. (The boiler itself
does not require purging as this will be done by the
automatic burner sequence control).

13.4 Initial Lighting

The lighting procedure of the boiler is fully automated.
To prepare the boiler for initial lighting first ensure that
all external controls are not calling for heat.
With the front casing panel and inner casing panel
removed turn on the mains electrical supply. Slide the
On / Off control down to the I position to turn on the
FLOW
boiler. The operating indicator will illuminate (green) to
PIPE
show that the boiler is on.
Now adjust the boiler thermostat to its lowest setting by
pushing the mode button (see Fig. 3.1.) until the radiator
symbol is displayed. Push the - button until the lowest
temperature possible is selected. Now return to the nor-
mal mode by pushing the mode button, the display will
now show the current temperature of water in the boiler.
Now turn on external heat demand to boiler.
The fan should start and after a few seconds the ignition
will commence.
VENT POINT
If the burner fails to light the fan will stop. Initially this
may be due to air in the gas supply line.
The boiler will have three attempts at ignition.
To reset the boiler slide the On / Off control to the Off
(O) position and after 5 seconds back to the On (I) posi-
tion. The boiler should now restart.
Once the boiler has lit, allow the system to warm at the
minimum temperature setting to purge any air from the
system.
Once the system has been purged of air, the temperatu-
re of the central heating water can be adjusted to the
desired setting by pushing the mode button (see Fig.3.1.)
until the radiator symbol is displayed. Pushing the + or -
buttons will then set the water temperature as desired.
(Typical setting temperatures for a normal radiator hea-
ting sytem will be in the range of 60 °C to 80 °C. Note
that set temperatures below 60 °C will not sufficiently
heat any hot water cylinder). To return to the normal
mode push the mode button (
shows the current temperature of water in the boiler.
Note!
Allow the boiler to run on minimum until com-
missioning is complete.
Instructions for Installation and Servicing ecoMAX pro
) until the display