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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.
Continued loss of water pressure should be investigated.
Some boilers have integral filling loops- consult the installation instructions.
Disconnect the loop after filling.
If a dripping tap cannot be stopped with a new washer it probably needs reseating. There is a special reseating tool for this job. Sometimes water finds its way behind the washer wearing a groove in the jumper this groove can be removed with a flat file.
Newer taps will jamb altogether if the washer becomes flat and the inner jumper that carries the washer runs out of thread. In this case the tap will need to be dismantled, rewashered and reassembled insuring that the retaining circlip is in place at the top of the spindle (see diagram).