Balancing heating system

[slacky]

The there is a couple of lockshields in the flow. How much to close and open them by? Off the top of my head upstairs are around 1/4 open and downstairs are a full turn open

 

[doitmyself]

How much to close and open them by? Off the top of my head upstairs are around 1/4 open and downstairs are a full turn open

I did advise adjusting the LS valve by 1/12 turn or less. Large changes, which you seem to doing, just makes it more difficult to get the system balanced. Most LS valves are fully open by 1½ to 2 turns from closed.

If you have recorded the current differentials for each rad, please post the info.

 

[slacky]

I did advise adjusting the LS valve by 1/12 turn or less. Large changes, which you seem to doing, just makes it more difficult to get the system balanced. Most LS valves are fully open by 1½ to 2 turns from closed.

If you have recorded the current differentials for each rad, please post the info.

If one rad is hot and another is cold I try to just turn it by 1/4 down and the other 1/4 up see if that changes anything but doesn't seem to be doing much.

I'll take the readings when I get in later and post.

Thanks for the help

 

[slacky]

Here are the readings in order they warm up

Bathroom 71 degrees flow, 53 degrees return, 1/4 open and the lockshields on the flow

Side door 70 degrees flow 58 degrees return, open 1/4 turn and Ls on the flow

Bedroom 2 71 degrees flow 48 degrees return, 1/4 turn open

Bedroom 3 75 degrees flow 58 degrees Return 1/2 open

Bedroom 1 70 degrees flow 48 degrees return 1/4 open

Front door 71 degrees flow 61 degrees return, Ls on the flow and 1/2 open

Left the heating on for an hour or so before taking the temps, the living room and kitchen rads was cold

At the boiler The flow is 72 degrees and return is 59 degrees

The pumps on speed 3

 

[slacky]

Any one got any ideas ?

 

[doitmyself]

the living room and kitchen rads was cold

Thanks for the data.

Do you mean that the living and kitchen rads were literally cold, i.e. flow and return about 20C? If not what were the flow and return temps?

If the temperatures were so low, there is no flow through those rads. This could be caused by either an airlock in the pipes to the rads, or TRVs stuck shut, or by other rads robbing the problem rads of any flow.

Looking at the data:

Bedroom 3 is an anomaly with a flow temp of 75, which is higher than the flow at the boiler (72). All other rads are OK with a flow temp slightly below boiler temp. Are you sure about Bed 3 temps?

There is a large difference in the differentials ranging from 10C (Front Door) to 23C (Bed 2).

 

[slacky]

Thanks for the reply

Yesterday to get heat to the down stairs rads I turned the bathroom and bedroom 3 trvs off. Turned them back on then started the heating strangely enough all rads are hot even the down stairs ones.

Just checked and the kitchen flow is 64 and return is 55. Living room is 64 flow and 44 Return.

Just checked bedroom 3 flow again it's now 70 and return is 56.