Return pipework

[dave1]

Apologies for the poor drawing but I'm tired, this is a y plan sealed system. As you can see the hot water is not the last tee into the circuit, the issues with this are the central heating will not return effectively resulting in very poor performance on the rads. It's like it's air locked or blocked. 100% no blockage in pipework, bypass check, 3 port checked, pump checked. I'm really just interested in whether the pipe layout would be affecting it?

I've only drawn the return pipework to simplify it

Thanks

 

[beesley121]

I'm guessing the pump is near the boiler? That 't' in the top right of your pic wont help one bit

 

[hammers4spanner]

plenty of 22mm in the circuit??

 

[GasmanxxxR1]

The cylinder looks like the cylinder is on the last tee? I think saying last tee is wrong maybe we should say cylinder and rads teed together once

 

[Ch4 plumbing]

Have you spent some time balancing the heating?
Does it work better heating only?

 

[Reg Man]

System balancing? Auto bypass? basic system set up one thinks.

 

[dave1]

100% not a balancing or bypass issue. Pump is inside the boiler flexicom 18sx.

 

[dave1]

If I reconfigured the pipework like this do you think it would help?

 

[Ermintrude]

Put a gate valve on return from cyl and bring all your rads to a common return . In effect two units

 

[GasmanxxxR1]

If I reconfigured the pipework like this do you think it would help?

View attachment 17784

No, that way you get back fed rads

 

[buckley plumb]

Apologies for the poor drawing but I'm tired, this is a y plan sealed system. As you can see the hot water is not the last tee into the circuit, the issues with this are the central heating will not return effectively resulting in very poor performance on the rads. It's like it's air locked or blocked. 100% no blockage in pipework, bypass check, 3 port checked, pump checked. I'm really just interested in whether the pipe layout would be affecting it?

I've only drawn the return pipework to simplify it

Thanks

View attachment 17757

looks ok to me from that drawing the cylinder is the last tee its where it is teed .

 

[buckley plumb]

If I reconfigured the pipework like this do you think it would help?

View attachment 17784

no difference from 1st drawing just tee is closer nothing wrong with the 1st

 

[buckley plumb]

have you checked the pump valves had one stuck partly closed - boiler thermistors

 

[dave1]

have you checked the pump valves had one stuck partly closed - boiler thermistors

No pump valves.

 

[buckley plumb]

just out of intrest force the boiler into full rate using the engineers code and gas rate it to make sure its not modulating down - check the d settings to make sure its set to the correct kw rating and not been range rated down .

 

[dave1]

just out of intrest force the boiler into full rate using the engineers code and gas rate it to make sure its not modulating down - check the d settings to make sure its set to the correct kw rating and not been range rated down .

Will do thanks

 

[buckley plumb]

check d0 is set to max kw
check d5 flow temp is set to 75 -82
use d3 to see what temp flow is getting to