Hi,
I have a Y Plan system with Glowworm HX system boiler vented system. The system as originally fitted has one radiator without TRV (Landing) but also has a gate valved controlled by-pass. The pump is controlled by an output from the boiler.
Many years ago I added an Honeywell ABV and this has worked OK up to a recent change for pump to a UPS3 which I have set to PP2 as this seems to be the best overall setting in practice. I've shut the by-pass gate valve as in this mode (or any UPS3 pump mode for that matter) the ABV will no longer work as it needs to (see other forum posts). This has left the landing radiator as the "by pass".
Last year I changed to the Wiser control system and this works very well apart from the fact that the landing radiator is always on when any wiser controlled radiator is demanding heat meaning that the landing gets too hot. Having recently retired and so now have the CH all day this is becoming more noticeable and so I'd like to add a Wiser TRV to the landing radiator but obviously need to reinstate a by-pass.
The Wiser system is such that when the TRV's are all closed the CH demand is removed so the question is could I fit a relay into the 3 port valve wiring as per the attached diagram (along with appropriate surge protection) such that when the is no demand (CH or HW) and the pump may want to overrun, the power is cut to the valve and it returns to the HW (Port B) under spring control and so open the HW coil as a "by pass)?
Hope that makes sense. Any help greatly appreciated.
Many thanks
Dave
I have a Y Plan system with Glowworm HX system boiler vented system. The system as originally fitted has one radiator without TRV (Landing) but also has a gate valved controlled by-pass. The pump is controlled by an output from the boiler.
Many years ago I added an Honeywell ABV and this has worked OK up to a recent change for pump to a UPS3 which I have set to PP2 as this seems to be the best overall setting in practice. I've shut the by-pass gate valve as in this mode (or any UPS3 pump mode for that matter) the ABV will no longer work as it needs to (see other forum posts). This has left the landing radiator as the "by pass".
Last year I changed to the Wiser control system and this works very well apart from the fact that the landing radiator is always on when any wiser controlled radiator is demanding heat meaning that the landing gets too hot. Having recently retired and so now have the CH all day this is becoming more noticeable and so I'd like to add a Wiser TRV to the landing radiator but obviously need to reinstate a by-pass.
The Wiser system is such that when the TRV's are all closed the CH demand is removed so the question is could I fit a relay into the 3 port valve wiring as per the attached diagram (along with appropriate surge protection) such that when the is no demand (CH or HW) and the pump may want to overrun, the power is cut to the valve and it returns to the HW (Port B) under spring control and so open the HW coil as a "by pass)?
Hope that makes sense. Any help greatly appreciated.
Many thanks
Dave