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10.2.3 Combination Boiler Filling
Filling mode provides a facility to assist in removing air from the system during system filling.
The Filling mode is activated by simultaneously pressing the DHW- (2) and CH- button (6) for 10
seconds. The appliance must not be in ‘OFF’ mode.
During this function:
1. All heat demands are disabled
2. The circulating pump operates at the maximum speed
3. The diverter valve is moved to mid position
During this function, ‘FILL’ is shown on the LCD:
The function can be disabled by pressing the Mode button (3) for 5 seconds.
Alternatively the function is automatically stopped after a timeout period of 15 minutes. A
countdown timer is shown on the auxiliary digits.
10.2.4 System Pressure
Water loss from the system as indicated by a reduction in pressure on the pressure gauge may
be made up through the filling loop. In the first week of operation it is normal to see a drop in
system pressure. After this time the system pressure must be rechecked and the system
refilled. Failure to do so may lead to boiler faults.
Special attention must be given to the concentration of corrosion inhibitors in the system water
where there is a need for topping up or refilling. Inhibitor concentrations must be restored to the
concentrations specified by the inhibitor manufacturer.
Frequent or routine refilling and topping up of the system should not be necessary on an
ongoing basis and may prove harmful to the appliance. Should topping up prove necessary on a
frequent or routine basis you must contact Warmflow or your installer.
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