Bypass on y plan

[SJB060685]

If its open for CH it will probably short circuit and go straight back to return. This will in turn cause the boiler to modulate down. The bypass needs to be installed between the common flow and common return.

 

[Matt0029]

Thanks so a strange place to fit a bypass. Plus isn't really needed as discussed earlier.

 

[ShaunCorbs]

Best to leave alone and just change the valve then you can’t be blamed for something not working or a rad not heating up

 

[Matt0029]

Does anyone known to get the actuator of this valve does the motor need removing?

 

[Matt0029]

Best to leave alone and just change the valve then you can’t be blamed for something not working or a rad not heating up

Thanks yes I did think of swapping as looked abit old. But don't want to change something if it's worked like that for 20 years though appears a strange set up.

 

[ShaunCorbs]

Eph valve I think

 

[Matt0029]

And just to confirm no bypass needed even if a pump over run was wired in on a system with a 3 port valve. As a 3 port valve is always open to one port? It doesn't shut off like a 2 port valve. Only really worked on S plans before.

 

[Matt0029]

Eph valve I think

Correct

 

[ShaunCorbs]

One port is always open on a 3 port you can shut them

 

[SJB060685]

I'd just shut that gate valve completely mate, or remove it. As it is its causing a short circuit, which in any demand is causing an underflow in each circuit and not good.