Recent content by DL2000

There are no individual by-passes before the valves but there is a main by-pass which joins the output and return pipes to the boiler. The tap on this is is fully closed though. All of the valves are on the right way. Sorry, I don't understand what you mean when you ask whether the system...

Hi. I have just had a new pressurized HW and CH system installed with 2 heating zones. It uses 2 Honeywell V4043H valves to control the flow of water for the upstairs and downstairs CH separately. My problem is that when the upstairs heating control is switched off and the downstairs...