radiator temperatures

[glasuni03]

Hi folks, and so The problems with the GCH continue!!

It's now cold and have the heating on more frequently. We noticed that when the trvs are turned down in all rooms upstairs the rads downstairs get warm but not piping hot? When the trvs in the rads upstairs are turned up to heat the rads then strangely the rads downstairs get piping hot?

The GCH pump (only 8 months old Grunfos Alpha 2) is upstairs as is with the hot water tank and boiler downstairs in the kitchen (8 months old too).

I would have thought the rads downstairs would have been piping hot if no demand for heat in bedrooms thus pushing the water downstairs??

Absolutely no idea what is going on with this system. Any thoughts and things to try?

Cheers

 

[Armo74]

The TRV's control the room temperature not the temperature of the rad. Has the system been balanced correctly?

 

[gas_man_gaz]

what have you got the pump set at?

 

[glasuni03]

Hi the system was balanced by British Gas but we've only just noticed this problem due to the cold snap

The pump is on setting 2. We did try 1 bu this is not enough to heat the entire rads


Is there anything else that it could be?

 

[Nige F]

Hi the system was balanced by British Gas
Is there anything else that it could be?

No - it`s all their fault

 

[newbuildinstaller]

forget the rad temps!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

are the rooms the correct temp is the question. The TRVs switch the rad off when the room is the correct temp so they will not be red hot.

Also the upstairs could be heated by the rooms below (heat rises) meaning the upstairs TRVs will close sooner as the rooms will heat up faster meaning the rads feel warm as opposed to hot.

TRVs are for ROOM temp NOT RAD temp

 

[glasuni03]

Hi - The room stat is set at 25 degrees and the TRV downstairs are all opened fully.

The hall rad doesnt have a TRV as this is the bypass rad and it has began to cool down when upstairs TRV's are set lower but gets piping hot when the upstairs TRVs are turned up.

No need to be cheeky. Im not a gas engineer but was just looking for some advice as the rad with no TRV should not be cooling down at all. Oh and all the rads have been bled too so its not air build up.

Thanks

 

[D_Hailsham]

the TRV downstairs are all opened fully.

Why? Do you really want the rooms downstairs to be at 30C?

The hall rad doesn't have a TRV as this is the bypass rad

Where is the wall stat located?

Your system is giving all the symptoms of incorrect balancing.

Check how many turns are required to shut each lockshield valve (that's the one at the other end from the TRV/wheel valve). The cover will just pull off, though it may be held by a screw. The spindle turns clockwise to shut.

If you have to turn a LS valve more than one turn, the system has not been balanced correctly. Most rads will only require the valve a quarter or half a turn open from closed.

 

[glasuni03]

Hi thanks for further info....

The room stat is in the living room. I could try to check to see if the LS has been opened too much.

Come to think of it - the rad in our bedroom sounds as if the water is rushing in when it is on. If the pump is upstairs how open should the LS valves be?

Thanks a lot it's much appreciated

 

[glasuni03]

Hi thanks for further info....

The room stat is in the living room. I could try to check to see if the LS has been opened too much.

Come to think of it - the rad in our bedroom sounds as if the water is rushing in when it is on. If the pump is upstairs how open should the LS valves be?

Thanks a lot it's much appreciated

 

[JohnD]

the rad in our bedroom sounds as if the water is rushing in when it is on.

then it has air in it.

when you bleed the highest radiator in the house, does water squirt out forcefully, and without the pressure dying away?