No heat upstairs, new pump installed, Boiler moved closer...

[rebelbuttmunch]

I use my hands, a bit rubbish, but inlet pipe is hot and outlet pipe is warm and the rad is hot, then its good enough for me.

 

[Jfin]

Beginning to think that may be the method of choice for a lot of people, i got this far with that method - maybe need to close the rads closer to boiler even more (choke the hell out of them) as they are still V-hot) even though flow is 1/4 turn

 

[rebelbuttmunch]

Yeah, close them until the outlet pipe is only mildly warm.

 

[Jfin]

one last question - would a slower pump speed mean water gets hot quickly or slowly how does it differ to a high pump speed?

 

[DP]

Pump is there to move water- it has nothing to do with hewating of water. Water is heated by the boiler. Slower pump speed means water stays in the radiators longer (that is if the system is operating correctly) so return water to boiler is cooler.

 

[rebelbuttmunch]

Id also say that a higher pump speed would pump water further. So far radiators that wont heat on a low pump speed might heat on a high pump speed.

 

[D_Hailsham]

LS=lockshield Valve - When the instruction says open all lockshield valves is it both floow and return they refer to or just the flow?

Are you referring to item 3 in the instructions?

If so, it means you open both valves on the rad. If you have a TRV you remove the head so the valve stays fully open.

Balancing is done using the LS valve, which is usually on the return. If you have a TRV, it's the valve at the opposite end. Manual valves can be either end, so you can move the manual valve to the flow end if you want to.

As for thermometers, get an IR digital version from Maplin - cost about £25. You only need one as they read temperatures instantaneously.

Pump is there to move water- it has nothing to do with hewating of water. Water is heated by the boiler. Slower pump speed means water stays in the radiators longer (that is if the system is operating correctly) so return water to boiler is cooler.

If the pump speed is wrong the boiler will not work correctly. If it is too low, the boiler will overheat; if it is too high the water will not get up to temperature.

Id also say that a higher pump speed would pump water further. So far radiators that wont heat on a low pump speed might heat on a high pump speed.

The system is a closed circuit, the water just goes round and round. The pressure is highest at the exit from the pump and reduces around the circuit. Water flows through the radiator because there is a pressure difference between the ends of the radiator. If the pressure difference is not enough, the water will not flow through the rad. If the pump does not provide enough head, the flow through the last rad will not be high enough.

 

[rebelbuttmunch]

Id also say that a higher pump speed would pump water further. So far radiators that wont heat on a low pump speed might heat on a high pump speed.

The system is a closed circuit, the water just goes round and round. The pressure is highest at the exit from the pump and reduces around the circuit. Water flows through the radiator because there is a pressure difference between the ends of the radiator. If the pressure difference is not enough, the water will not flow through the rad. If the pump does not provide enough head, the flow through the last rad will not be high enough.

Couldnt some of the rooms be t-eed off the main closed system, and arn't the rad's t-eed off the system?

 

[D_Hailsham]

Id also say that a higher pump speed would pump water further. So far radiators that wont heat on a low pump speed might heat on a high pump speed.

The system is a closed circuit, the water just goes round and round. The pressure is highest at the exit from the pump and reduces around the circuit. Water flows through the radiator because there is a pressure difference between the ends of the radiator. If the pressure difference is not enough, the water will not flow through the rad. If the pump does not provide enough head, the flow through the last rad will not be high enough.

Couldnt some of the rooms be t-eed off the main closed system, and aren't the rad's t-eed off the system?

Yes, but it makes no difference, all the rads are part of the same closed system.

Think of the system as a ladder with the two sides as the flow and return connected to the boiler at the bottom. The radiators are the rungs of the ladder. The water is pumped up one side and some of it goes through each rung and the rest travels on upwards. When it reaches the last rung it becomes the return and on the way down collects all the water which has travelled through the lower rungs.

There may be branches off the main flow and return with rads on the branch, but they are still part of the same closed system.