S
Schvink
After fitting a new pump or section of pipework to heating system with an external pump, its a pain to remove all the air with in the pump. This can cause a nightmare for circulation and pump failures. My tip for ensuring the air is removed and full operation of the pump is resumed, is to add a tiny amount of washing up liquid, either directly into the pump (whilst the system is drained) or via the filling loop. Trust me it works.
This will ensure a recall free job every time after a drain down.
This will ensure a recall free job every time after a drain down.