- Flow at boiler 58, return at boiler 44.
Make and model of boiler?
Have you set the boiler temperature to 58 or is it automatically determined by the boiler?
If you set it to 58, why?
If you can adjust the boiler temperature, try setting it to 70 or 75 and check the rad temperatures again.
Do you have a room thermostat?
Balancing of microbore systems will always be tricky as the radiators are not in parallel, like the rungs on a ladder. This pic shows the difference -
Assuming you have a two storey house, you will probably have one pair of manifolds for the ground floor rads and a second pair for the first floor rads. The pipes from boiler to manifold will probably be in 22mm; only the pipes from manifold to rads will be 8mm or 10mm.
All the rads fed from one pair of manifolds will heat up almost instantaneously, though the smaller rads will tend to heat up quicker. Adjusting the LS valve alters the flow rate through the radiator. The flow rate is directly proportional to the radiator output (flow for a 2kW is twice that for a 1kW). But this does no mean the LS valve has to be open twice as much, due to the design of the typical LS valve.
Try adjusting the rads in size order - largest first - and have the LS open as little as possible to give the required differential. You will have to adjust the LS by an eighth of a turn or less at a time and leave sufficient time for the temperatures to stabilize.
- Closed all lockshields except kitchen.
- Started boiler and worked around rads in the above order. Readings as follows:-
Kitchen Flow (F) 42 Return (R) 36
Dining Room F 47 R 35
Living Rm F 54 R 42
Bathroom F 51 R 40
Hall F 52 R41
Daughters Room F 55 R 42
Our Room F 54 R 44
Are these temps after you have adjusted the LS valve?
Most of them have a differential of between 10 and 12 degrees; the exception is the kitchen where it is only 6 degrees.
A difference in the flow temperature at each rad is to be expected as there will be some heat lost in the pipe from manifold to rad; but that does not explain the large drop for the kitchen and dining room radiators.