Discuss 3 tee in the Central Heating Forum area at PlumbersForums.net
I don't follow you. You suggest elsewhere that the cylinder return could run back along the rad return. If the rad circuits are on, then how can the return from the cylinder possibly flow back against the current? Pumped water flow cannot in run two directions through the same pipe simultaneously, can it?If I've understood what you're saying correctly, I think you're right, there's a potential issue. If the upper and lower rads each have their own zone valve I can't see that your going to get reverse circulation in the 'Why are my radiators hot in the middle of summer?' sense but there'll be some starvation of heat to the radiators when the DHW is heating and both rad zones are supposed to be on.
At the time I wrote my answer, I was assuming that the upper floor and ground floor radiators had their own separate zone valves (there were several shown in the picture) but @ShaunCorbs said in later that they were on a singe zone.I don't follow you. You suggest elsewhere that the cylinder return could run back along the rad return. If the rad circuits are on, then how can the return from the cylinder possibly flow back against the current? Pumped water flow cannot in run two directions through the same pipe simultaneously, can it?
Obviously I get that having multiple circuits in use at the same time may reduce head and thus flow.
Okay, kind of got you now. Ta.At the time I wrote my answer, I was assuming that the upper floor and ground floor radiators had their own separate zone valves (there were several shown in the picture) but @ShaunCorbs said in later that they were on a singe zone.
In the actual system, I think that literal 'reverse circulation' can occur when the (single) zone valve to the radiators is closed and the DHW is heating. When the radiator-zone valve is open the 'reverse circulation' will be superimposed on, and hence reduce, the forward flow in part of the radiator circuit and might impair performance to a greater or lesser extent.
Take a minute to sketch a diagram of the pipework it'll make my thinking much easier to understand.
NRV on CH? They're only for water aren't they.Haven’t filled up but the distance between was less than 5” so opted for a nrv
NRV on CH? They're only for water aren't they.
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