What happens if there is no apparent flow through the CLEARFLOW unit when the flow reverser handle is in one direction?
If the system is a gravity hot water system, there is probably an anti gravity / non return valve in the radiator circuit. If the non return valve is accessible, either loop it out, or remove the plunger so that it doesn’t prevent the flow of water in one direction. If you can’t find the non return valve, the flow reverser lever must be left in one direction. CF30 Classic: If you can’t dump with the lever in this direction, swap the two flow and return hoses over where they connect to the system. If you have the DDV (double dump valve) or Hyper-Jet versions of the CF30, then you’ll just dump through the one dump valve that does work.
