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5.3 HEATING SYSTEM FLUSHING
CAUTION: Flush the heating installation thoroughly prior to installation.
The heating system should be flushed which will remove any debris or contaminants detrimental to the operation
and life of the boiler. Any cleanser or additives used should comply with current standards and the manufacturer’s
instructions carefully followed.
NOTE: IT IS IMPORTANT NOT TO USE THE BOILER PRESSURE RELIEF VALVE TO DRAIN OR FLUSH THE
SYSTEM AS TRAPPED DEBRIS WILL CAUSE INCORRECT OPERATION. A PURPOSE PROVIDED DRAIN
POINT SHOULD BE USED.
5.4 HEATING SYSTEM INITIAL FILLING
Ensure both flow and return isolation valves are open. Identify the boiler automatic air release valve at the top
right hand side of boiler and loosen the cap. Close any manual air vents fitted on the system.
Be careful not to splash any of the electrical components.
Fill slowly until the pressure gauge indicates between 1 and 1.5 bar.
Proceed to vent all the manual release valves until all air is purged from the system. It will be necessary to top-up
through the filling during this operation, filling the installation until the pressure gauge indicates between 1 and 1.5
bar.
5.5 PUMP CHECKING & VENTING
Sometimes (i.e. if display fault E3) it is necessary to check that the pump is properly vented and spinning freely.
To purge the pump, turn on the boiler and with the pump selector, alternate between positions III and Min every
fifteen seconds. Keep this operation for 5 minutes.
If excess air remains in the system or there is insufficient pressure or flow rate the boiler will fail to operate and
display fault E3.
A LED indicator informs about the operating status of the pump:
-
Green: correct operation.
-
Green / red flashing: Lower voltage U<180V; overvoltage U>253V; Module overheating
-
Red flashing: pump blocked.
5.6 FILLING DOMESTIC HOT WATER
Open the mains water inlet valve underneath the boiler. Turn on all the hot water system taps and thoroughly
flush allowing water to flow until no air is present. This will automatically vent the integral hot water store of any
air.
5.7 MORE INSTALLATION DATA
It is possible to display more installation data by pressing
for a few seconds and then
or
.
Heating return temperature.
Maximum output limitation in kW.
Modulated output in kW.
Outdoors temperature. (Only if the sensor is connected and P05 is activated).
