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11 Commissioning
At the time of commissioning, complete all relevant
sections of the Benchmark Checklist located in the
centre pages of this document.
The commissioning should be carried out by a competent
person approved at the time by the Health and Safety Executive
and in accordance with the current issue of BS6798.
11.1 Switching on
• Do not operate the boiler without water.
• Make sure that the system has been thoroughly fl ushed out with
cold water and that all cleanser if used has been removed.
• With the gas service isolation valve closed, with no demand
from any external controls and the power supply to the boiler
switched off.
• Test for gas soundness and purge air from the gas supply.
• Switch on the power supply to the appliance.
• Make sure that the domestic hot water and heating functions
on your appliance are not activated and the hot water taps
are turned off.
11.2 Filling the CH system (Central heating)
• Make sure that the installation's cold water inlet isolating valve
is open.
• Open the water isolating valves located on the connections:
they must be positioned in the direction of the fl ow.
With the gas isolation valve closed and with no demand from
any external controls.
a) Fill the heating system, using your preferred method
previously described.
b) Vent all air from the system, repeat as necessary until the
system is full and all the air has beren removed.
c) To comply with the water regulations the fi lling loop connection
must be removed.
1
3
2
Key
1 Air vent
2 Pump
3 Screw for the pump shaft
• Open the plug on the air vent located on the pump and
automatic air vents on the installation.
If the (CH.) pressure falls below 0.4 bar, the display will fl ash
the current pressure and the boiler will not operate. To increase
the pressure, the CH circuit requires " Topping up".
When turning the 230Vac supply on to the boiler
should the water pressure be less than 0.5 bar an
automatic air vent function will be activated for a
period of 5 minutes. During this time the pressure
should be increased and air vented from the system.
Note that the burner will not fi re in either the CH or
DHW mode and the display will blink displaying the
current water pressure.
• Vent air from each radiator until the water fl ows normally,
then close the vents.
• Leave the pump's air vent open.
The following two operations will unblock the
pump' s impeller after a prolonged storage period
and will purge the air from the pumps circuit.
• Remove the screw from the pump shaft and introduce a fl at
screwdriver. A trickle of water, under no pressure should
normally come out of the pump.
• Rotate the pump's shaft through several turns, then replace
the screw.
11.3 Filling DHW Circuit
• Open the various hot water taps to fi ll the DHW circuit.
11.4 Filling the Condensate Trap
1
• Remove and fi ll the trap (1), 3/4 full, with water.
