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Central heating systems that are sealed i.e. combination and other boilers where there is no feed and expansion tank, may require topping up from time to time due to a loss of water.
This may be because a radiator has been removed
for decorating or perhaps some other work has taken place on the system but what
ever the cause the system will need replenishing and this is done via the
filling loop. The filling loop is usually a braided flexible hose located
adjacent to the boiler. It allows a temporary connection from the cold water
supply to the heating system.
To
top up the system connect the loop to the cold supply and the heating system.
There will be at least one valve on the cold feed and possibly a second on the
heating pipe. Open them slowly and carefully raise the water pressure within the
system keeping a close watch on the pressure gauge, do not over fill 1 bar is
often enough.