Presumably you're going to replace the HW cylinder? What is the bypass round the pump for?Thanks both. Makes total sence..
I'm removing all of this but need to know how to connect up new system (s plan) into existing ch plumbing....
What is the bypass round the pump for?
It would probably have been an old manual system bypass onto the HW primary return, wasn't really needed given it's a 3port, unless all the rads had TRV'sGate valve looks to be an old redundant manual bypass on the return
But it shouldn't go to the pump suction, should it? The idea of the bypass is to maintain a minimum flow through the boiler, if all the TRVs etc close (as you obviously know).It would probably have been an old manual system bypass onto the HW primary return, wasn't really needed given it's a 3port, unless all the rads had TRV's
It is yes ... but that's not the negative side of the pump - the positive side of the pump is out of the top upwards towards the 3 port above - so the bypass is on the positive side and bypassing the 3 port back to the return. Even then though, at the moment it's redundant.The idea of the bypass is to maintain a minimum flow through the boiler
But IMHO it shouldn't go back to the pump return, but to the boiler return. It's the boiler we're trying to protect from low flow, not the pump (or at least not so much!)bypassing the 3 port back to the return
But IMHO it shouldn't go back to the pump return, but to the boiler return. It's the boiler we're trying to protect from low flow, not the pump (or at least not so much!)
You're right but the pipe it's connected to isn't the flow pipe into the pump - as suggested by @Hugh Jaleak , the bypass pipe from above the pump , is through the gate valve and then it's connected to what looks like it was the primary return (back to the boiler) from what must have been the old cylinder, which currently is open ended.But IMHO it shouldn't go back to the pump return, but to the boiler return. It's the boiler we're trying to protect from low flow, not the pump (or at least not so much!)
You're absolutely right, my bad. I hadn't noticed the one pipe hiding behind another.Zoom in on the pic and you'll see the pump and flow pipe into it is actually behind the pipe that the bypass is connected to
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