i have recently fitted some new rads to my system, replacing old singles with doubles, the system has been flushed a couple of times and clear water running through all of the system.
One problem i have is after the system ruuning for a few days when i bleed the double rads i have water coming out but there is also a hissing of air! do i need to keep bleeding until hissing has stopped? could it be one side of the rad is full of water but other still has air??
Also i added an extra rad on to the system teeing into 22mm pipe with 15 mm but this rad does not get hot the pipes don't even get hot is there a minimum distance the flow and return on a one pipe system has to be apart?
coul the return tee be too close to the flow tee? and how much 15mm pipe run can be made off the 22mm does that make any difference?
One problem i have is after the system ruuning for a few days when i bleed the double rads i have water coming out but there is also a hissing of air! do i need to keep bleeding until hissing has stopped? could it be one side of the rad is full of water but other still has air??
Also i added an extra rad on to the system teeing into 22mm pipe with 15 mm but this rad does not get hot the pipes don't even get hot is there a minimum distance the flow and return on a one pipe system has to be apart?
coul the return tee be too close to the flow tee? and how much 15mm pipe run can be made off the 22mm does that make any difference?