27
FILLING & FLUSHING
Electric Boilers
Ensure that both flow and return isolation valves fitted as part of your installation are fully open. Find the
Automatic Airvent behind the pump and ensure that the cap is freely moving and not screwed down in the closed
position. Connect the filling loop to the Water Replenishing connection, open the valve fully and allow the system
to fill slowly until the pressure gauge reads between 1 and 1.5 bar, at which point the replenishing valve should
be shut. Ensure that you add inhibitor to your system, refer the manufacturers guidance for diluation rates. For
the moment please leave the filling loop connected until you have purged the air out of the system.
HEATING SYSTEM INITIAL FILL:
FLUSHING:
The system must be flushed to 10% of mains PPM (chloride and otherwise) or lower to ensure that the water
system is not detrimental to the lifespan of the boiler. If the boiler is being installed into an existing heating
system, a power flush must be carried out on the radiators and pipework to remove any potential debris.
Ensuring that the isolating valve before the cold water inlet is fully open, open all hot water taps on the hot water
circuit 1 at a time and run until all air has ceased coming out of the tap, it is important to wait a moment until
all spluttering has stopped. If any air remains in the hot water element of the boiler when power is turned on the
water heating element can prematurely fail.
HOT WATER INITIAL FILL:
(COMBINATION BOILERS ONLY)
