Drop across radiators

[Mikeyward]

I've got a worcester bosch 21 ri greenstar and looking to balance my radiators what should the temp drop be across the flow and return on the radiators I've checked the flow from the boiler and that's at 60 degrees

 

[Jurassicspark]

You should be trying to achieve a 12 degree difference.

First try to decrease the flow to the nearest rads from the boiler and then work your ways from there.

 

[Mikeyward]

Ok thanks I will give it ago when I've checked the rads to see which one heats up first it's not the one closest to the boiler I've got a small rad on the landing and that one seems to heat up first

 

[Mikeyward]

The boiler is a condensing boiler so would that still be 12 degrees

 

[Jurassicspark]

The boiler is a condensing boiler so would that still be 12 degrees

Yes and for the overall drop from the flow and return you should be achieving a delta T of 20C.

 

[Jurassicspark]

I've got a small rad on the landing and that one seems to heat up first

Open that up by 1/4 from the LS valve.Then work your way to the next radiator.

 

[Mikeyward]

Is the de

Yes and for the overall drop from the flow and return you should be achieving a delta T of 20C.

Is the overall drop the difference in the flow and return should be 20c on the boiler

 

[Mister Banks]

Is the de

Is the overall drop the difference in the flow and return should be 20c on the boiler

I wouldnt get to hung up on getting the delta t to 20c, not many modulating boilers manage that at 60c flow. Just get the return temp as low as possible.

 

[Mikeyward]

I wouldnt get to hung up on getting the delta t to 20c, not many modulating boilers manage that at 60c flow. Just get the return temp as low as possible.

Ok cheers so if I just try and get the flow and return on the rads to 12 degrees the just check the return temp on the boiler and see what it is

 

[Jurassicspark]

Is the de

Is the overall drop the difference in the flow and return should be 20c on the boiler

Try at least getting a return temperature of lower than 54C.

With your set temp at 60, a drop of 20 degrees will make the return temperature 40c which will achieve condensing.

 

[Mikeyward]

Try at least getting a return temperature of lower than 54C.

With your set temp at 60, a drop of 20 degrees will make the return temperature 40c which will achieve condensing.

Would it be better if I set the flow temp higher

 

[Jurassicspark]

Would it be better if I set the flow temp higher

The higher the flow temperature the more harder it is to achieve a lower temperature to allow the boiler to condense.

Up to 65 degrees (with a 20 degrees drop) will result in a 45 degree return temperature which still will condense.

It all depends on your system but having the temp set no more than 70C is best.

 

[Jurassicspark]

Don't worry about the boiler temperatures for now, just balance the system so that the radiators heat equally and after that you can check on the return temperatures.

 

[Mikeyward]

The higher the flow temperature the more harder it is to achieve a lower temperature to allow the boiler to condense.

Up to 65 degrees (with a 20 degrees drop) will result in a 45 degree return temperature which still will condense.

It all depends on your system but having the temp set no more than 70C is best.

Don't worry about the boiler temperatures for now, just balance the system so that the radiators heat equally and after that you can check on the return temperatures.

Ok thanks will try and balance the radiators first does it make it harder to balance as its 8mm microbore pipe going to the radiators