a close couple arrangement of vent and cold feed may be the answer - if you are pumping over something is wrong with the design
euge the plumber August 2010 |
If you are constantly bleeding air and the heating system is black then the chances are that there is no inhibiter in the system. Various gasses are produced in the absence of an inhibitor and the black inky type water is black due to ferrous products. Your central heating system iscorroding from the inside. This is not why it is pumping over, but I would certainly drain the system, flush and refil with an inhibitor to prolong the life of the system.
Noting the pump speed is set at 1, there are several other things you can try:
if you have a bypass valve then open it a quarter of a turn further, this will most likely be near the pump and joins the flow to the return across the pump.
Ensure that you have a decent swan neck on the end of the expansion pipe, this pipe is designed to take the increased volume as the system warms and expands. If the expansion pipe does not rise far enough above the water level in the expansion tank the circulation can result and the whole tank becomes part of the circulating system, often with a bad outcome.
Turning down of the boiler stat will also help and save a tidy sum in heating costs
Hope these tips help
Chris February 2010 |