Manual bypass valve

[TheVictorian]

Hi,

We have a Greenstar Ri system boiler on an open system. Most of the radiators have TRVs on as we have gradually replaced old rads with new ones, three radiators currently do not have TRVs.

I think we have a manual bypass controlled by the gate valve bottom left of the attached picture. Can this be closed off as we have three radiators without TRVs?

The system has recently been drained and refilled after replacing a rad and isn't getting as hot as I would like and is also cycling without the radiators getting too hot.

I understand the principle of balancing and bleeding the system but just want to know what I need to do with the bypass (assuming that is what it is!).

Thanks in advance for any tips!

Untitled

• TheVictorian
• 14 Apr 2014
• 1

 

[Whitespirit66]

Yes, turn it off. If you have three rads without TRVs, shouldn't be a problem. With a 3 port valve, there will always be an open route.

Good luck with it. If it's not been used in a while, gate valves can be tricky.

 

[TheVictorian]

Thanks Whitespirit, it should turn off easily enough as I tried it yesterday and was able to turn it 180 degrees and then back to the starting position with no problem.

Why would it originally have been fitted if it doesn't serve a purpose?

 

[Whitespirit66]

Why would it originally have been fitted if it doesn't serve a purpose?

Maybe the system was configured differently in the past, or just belt and braces. Looks like it's been there a while.

 

[TheVictorian]

Ok thanks, I'll turn it off tonight and see what happens!

 

[D_Hailsham]

Untitled

• TheVictorian
• 14 Apr 2014
• 1

The Grundfos pump won't last long the way it has been installed. The shaft must be horizontal, not vertical.

 

[Whitespirit66]

Good spot. Missed that one.