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If the system pressure falls below the minimum (e.g. due to the removal of a
radiator for decorating purposes) then the system should be topped up using the
filling loop. See Section 1.4 below. Special attention must be given to corrosion
inhibitor concentrations where there is a need to top up the system. See Section
1.5 below.
A pressure switch is included as standard on all Combi boiler models which
prevents the operation of the boiler if the system pressure drops below 0.3 bar.
Do not allow the flexible hoses connected to the expansion vessel to
become twisted, kinked or flattened. This may cause collapse of hose bore
compromising the function of the expansion vessel.
1.4 Filling Loop
The system pressure is topped up using the
filling loop. Open the valve to increase the
systems pressure.
On System models, set the pressure to 1 bar
when cold. On Combi models, increase the
pressure slowly until the low pressure
warning lamp just goes out. Refer to Section
1.6 for further guidance.
After topping up the system the valve must
be fully closed and the flexible filling loop
disconnected from the valve. Expect a small water loss from the pipe. Special
attention must be given to corrosion inhibitor concentrations where there is a need
to top up the system. See Section 1.5 below.
1.5 Corrosion Inhibitor
Special attention must be given to the concentration of corrosion inhibitors in the
system water where there is a need for topping up. Concentrations must be
restored to inhibitor manufacturers’ recommendations and monitored going
forward.
Frequent or routine topping up of the system should not be necessary 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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