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12 Commissioning
12.1 Filling Domestic Water Circuit
Make sure that the isolation valves are securely tightened.
Open all domestic hot water taps.
Fully open the DHW outlet and DCW inlet valves, see
diagram 12.1. Water will now flow through the boiler to the
domestic water tank and to the hot water taps.
Starting at the lowest tap, turn the hot taps off one at a time
until the hot water pipework is purged of air.
Carefully slacken, but DO NOT remove the air vent screw
on the domestic pump to release any trapped air within the
boiler, see diagram 12.4, secure when procedure completed.
NOTE: The water pressure at the vent point is that of the
incoming water main (max 3.5bar due to pressure reducing
valve).
Check for water soundness of the complete domestic water
system.
12.2 Filling the Heating System
Refer to diagrams 12.1, 12.2 and 12.3.
With the boiler in place:
1. Ensure that the filling loop flexible hose is securely
connected to the double check inlet valve.
2. Ensure that the gas isolation valve is closed.
3. Switch on the power supply to the appliance.
The boiler should be in OFF mode. This is indicated
by the ‘OFF’ symbol on the user interface display. If not,
press the ‘mode’ button repeatedly until the ‘OFF’ symbol
is displayed.
The display will now show a flashing system pressure.
Diagram 12.1
Diagram 12.2
FILLING
LOOP
VALVE
FILLING
LOOP
FLEXIBLE
HOSE
DOUBLE
CHECK
INLET
VALVE
QUICK
RELEASE
NUT
QUICK
RELEASE
NUT
FILLING
TAP "B"
FILLING
TA
P "A"
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