JohnMo Posted January 15, 2023 Share Posted January 15, 2023 Dumb question Looking for a 3 port diverter valve, to move flow from heating to DHW cylinder heating, not both at the same time. Everywhere I look a mid point valve comes up. What's the difference is just wiring or are they completely different things? Link to comment Share on other sites More sharing options...
ProDave Posted January 15, 2023 Share Posted January 15, 2023 COMPLETELY different. What you are wanting is a 2 way valve, When energised, it switches to one port, when not energised it switches to the other. Nice and simple and reliable. A 3 port 3 way valve is the work of the devil, something dreamed up by a boffin trying to do something as cheap as possible. It has a complex switching system that can stall the motor (with DC) at mid point to send water to both ports. You might gather I hate them and would never have one in my house. If you can't find a 3 port 2 way valve I would plumb it instead with individual 2 port valves. 1 Link to comment Share on other sites More sharing options...
JohnMo Posted January 15, 2023 Author Share Posted January 15, 2023 So just 2 x 2 port valves and use the power from heat pump to energise a change over relay. Power one relay to to have flow through heating, power relay from heat pump, power moves from one 2 port valve to the other, opens 2 port to cylinder? Link to comment Share on other sites More sharing options...
ProDave Posted January 15, 2023 Share Posted January 15, 2023 11 minutes ago, JohnMo said: So just 2 x 2 port valves and use the power from heat pump to energise a change over relay. Power one relay to to have flow through heating, power relay from heat pump, power moves from one 2 port valve to the other, opens 2 port to cylinder? Does the heat pump not have separate outputs for hot water and heating? If you really can't find a 3 port 2 way valve, you can get one normally open and one normally closed 2 port to work from one output. Link to comment Share on other sites More sharing options...
billt Posted January 15, 2023 Share Posted January 15, 2023 I've just bought one of these https://directheatingsupplies.co.uk/products/honeywell-v4044c-1569-3-port-valve-28mm?_pos=2&_sid=02d795d3f&_ss=r You can use a mid position valve as a diverter, connect the white and grey wires to the switched output and don't connect the orange wire. That's what I did on my CH system. Link to comment Share on other sites More sharing options...
PeterW Posted January 15, 2023 Share Posted January 15, 2023 You need to search for a Diverter Valve https://www.draytoncontrols.co.uk/products/motorised-valves/3-port-diverter/motorised-valve-3-port-diverter Link to comment Share on other sites More sharing options...
PeterW Posted January 15, 2023 Share Posted January 15, 2023 2 hours ago, JohnMo said: What's the difference is just wiring or are they completely different things? And yes - wiring is usually 5 wire with LNE to the valve motor and a SPST micro switch that is NC when the valve is energised Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now