heating issue

pat35

Im doing a job in a house 2,700sq/ft.The boiler is a potterton statesman 90/110.Boiler serviced.one rads upstairs were not working.I removed 3 rads upstairs and rinsed them out outside.They was a little bit of sludge in them,about a litre per rad or so.All rads now working,system balanced.I have two litres of hydrocare H+2 in the system which i will leave it in for a week.I dont have a powerflushing machine.All rads are now "warm top and bottom".The issue im having is that the rads are warm and i cant get them up to full heat.The flow on the boiler is 70 degrees + approx and the return is just warm.My question is "is the possible that the wilo pump circulator could be the issue as in weak or is it a powerflushing issue?.Thanks

Dtp1979

pat35 wrote: »

Im doing a job in a house 2,700sq/ft.The boiler is a potterton statesman 90/110.Boiler serviced.one rads upstairs were not working.I removed 3 rads upstairs and rinsed them out outside.They was a little bit of sludge in them,about a litre per rad or so.All rads now working,system balanced.I have two litres of hydrocare H+2 in the system which i will leave it in for a week.I dont have a powerflushing machine.All rads are now "warm top and bottom".The issue im having is that the rads are warm and i cant get them up to full heat.The flow on the boiler is 70 degrees + approx and the return is just warm.My question is "is the possible that the wilo pump circulator could be the issue as in weak or is it a powerflushing issue?.Thanks

Is there a balance valve fitted at the cylinder?

pat35

Yes,i have it open 3/4 of a turn.I would normally have it open one turn from the off position.I even tried it closed and it does not get the rads hotter.The rads do eventually get hotter if heating was on for a very long time and after alot of recycling of the boiler.Its like the boiler is waiting for the water to circulate

anthonyos

Is there a back boiler fitted

Dtp1979

pat35 wrote: »

Yes,i have it open 3/4 of a turn.I would normally have it open one turn from the off position.I even tried it closed and it does not get the rads hotter.The rads do eventually get hotter if heating was on for a very long time and after alot of recycling of the boiler.Its like the boiler is waiting for the water to circulate

If all piped correct then it's probably sludged up pipes

pat35

anthonyos wrote: »

Is there a back boiler fitted

No back boiler

Dtp1979

Or maybe a new pump is needed

pat35

Dtp1979 wrote: »

If all piped correct then it's probably sludged up pipes

Yes,seems to be piped correctly,no zones,I dont think this H+2 cleanser is going to do much for it.The only thing i see it the pump is on the flow from the boiler,i wonder could the impeller on it be damaged

anthonyos

Is it sealed system

shane0007

Is the boiler short cycling?
Did you check the flow & return temps at the boiler pipework?
Did you turn off all rads except one & see if it then heats from top to bottom?

pat35

anthonyos wrote: »

Is it sealed system

open vented

pat35

shane0007 wrote: »

Is the boiler short cycling?
Did you check the flow & return temps at the boiler pipework?
Did you turn off all rads except one & see if it then heats from top to bottom?

Yes the boiler is short cycling.All the rads are heating top to bottom except one in upstairs bathroom which is cold in bottom few inches.I didnt put the analyser on to check the flow and return temps at the boiler pipework as im not even close to where i should be at.

Dtp1979

I'd say sludge or maybe a weak pump. I'm not familiar with hydrocare but if it's a system cleaner then your gonna need to flush it out of the system some way in a weeks time