M
M7R
I found this site via google and it appears to be the best place to ask this question, so hopefully some one can help.
a year ago me and the wife got our first house, a nice 50s semi and as a bonus the old lady who lived there before us had had a new boiler fitted back in 2008, a Viessman VITODENS 100 ( the boiler before was a baxi back boiler as we still have the gas fire) at the time the new new boiler was put upstairs in the airing cupboard, new controls and wireless stat fitted, and all the old rads fitted with thermostats, plus a new hot water tank was fitted.
When we moved in back in dec 2010 i noticed the pump wasn't the quietest thing, but I had just moved out of my folks place which was a new build with a all singing all dancing beast installed...
I changed most of the rads last spring as the old rads were from the 60s and gave off no heat! so now I have the following fitted:
2 existing curved rads from the 60s, no fins. 1740mm x 620mm and 1270mm x 620mm (Both of these plan to be changed in the spring for 800 x 600 doubles, which is a bit over kill according to the online calculaors, however the way the bay is built does't keep in masses of heat as its single brick thick, and in the bed room the roof of the bay is flat with lead flashing and I suspect no insulation)
then the rest are all from Wickes, fitted with fins:
1100 x 600 single x2
800 x 400 single
800 x 600 double
1400 x 600 single
1600 x 600 single
The system has a WILO Gold R550 pump fitted, pumping downwards.
The problem is the pump is silent when cold, but as soon as the water starts to heats and gets above 45 deg it sounds like it is cavitating, and on initial start up you sometimes get a sloshy-slooush sound too.
I have tried the system on speed 1, but this just causes the boiler to cut out due to over heating..
it was running on speed 2 when we moved in, and has been for the last year, however when I mentioned to a friend that I seem to keep getting air in the bathroom and back bed room rads and described my noise to him he said I was getting cavitation and to turn the pump up to see if that helps.
I also filled the system with Feronox that he reccomended, (the system appears to be clear as when changing the rads last year we drained it and refilled it, but at the time I did not put any addative in as I was planning on doing the other 2 rads shortly after, however that plan got put on hold)
I tried speed 3 but it still made the noise...just higher pitched.
I have noticed though that the hall rad which is the long one gets hot on the inlet, and along the top, but the outlet never gets above luke warm, I tried to balance the system but with limited success.
any thoughts on what to do? the boiler temp is set to about 53 deg, it normally goes up to about 57deg cuts out, cools down to mid 40s then clicks back in again. (the heating is not controlled by a room thermostat, but I will start another post for that shambles!)
cheers
Karl
a year ago me and the wife got our first house, a nice 50s semi and as a bonus the old lady who lived there before us had had a new boiler fitted back in 2008, a Viessman VITODENS 100 ( the boiler before was a baxi back boiler as we still have the gas fire) at the time the new new boiler was put upstairs in the airing cupboard, new controls and wireless stat fitted, and all the old rads fitted with thermostats, plus a new hot water tank was fitted.
When we moved in back in dec 2010 i noticed the pump wasn't the quietest thing, but I had just moved out of my folks place which was a new build with a all singing all dancing beast installed...
I changed most of the rads last spring as the old rads were from the 60s and gave off no heat! so now I have the following fitted:
2 existing curved rads from the 60s, no fins. 1740mm x 620mm and 1270mm x 620mm (Both of these plan to be changed in the spring for 800 x 600 doubles, which is a bit over kill according to the online calculaors, however the way the bay is built does't keep in masses of heat as its single brick thick, and in the bed room the roof of the bay is flat with lead flashing and I suspect no insulation)
then the rest are all from Wickes, fitted with fins:
1100 x 600 single x2
800 x 400 single
800 x 600 double
1400 x 600 single
1600 x 600 single
The system has a WILO Gold R550 pump fitted, pumping downwards.
The problem is the pump is silent when cold, but as soon as the water starts to heats and gets above 45 deg it sounds like it is cavitating, and on initial start up you sometimes get a sloshy-slooush sound too.
I have tried the system on speed 1, but this just causes the boiler to cut out due to over heating..
it was running on speed 2 when we moved in, and has been for the last year, however when I mentioned to a friend that I seem to keep getting air in the bathroom and back bed room rads and described my noise to him he said I was getting cavitation and to turn the pump up to see if that helps.
I also filled the system with Feronox that he reccomended, (the system appears to be clear as when changing the rads last year we drained it and refilled it, but at the time I did not put any addative in as I was planning on doing the other 2 rads shortly after, however that plan got put on hold)
I tried speed 3 but it still made the noise...just higher pitched.
I have noticed though that the hall rad which is the long one gets hot on the inlet, and along the top, but the outlet never gets above luke warm, I tried to balance the system but with limited success.
any thoughts on what to do? the boiler temp is set to about 53 deg, it normally goes up to about 57deg cuts out, cools down to mid 40s then clicks back in again. (the heating is not controlled by a room thermostat, but I will start another post for that shambles!)
cheers
Karl
