are the inlet/outlet valves in the wrong place

reggaeman

Radiator problem.

I Drained the system out again. I then bled the rads from upstairs. When I got to the last (the new one) It started to get hot. But this is the strange thing. It was getting nice and hot and then started to go cold. I noticed the hot water was coming in from the right side. the left side inlet pipe was still cold. So now Im thinking have the inlet and outlet valves been put on the wrong way. All the other rads have the inlet on the right.
The old rad I took off had the same problem' It would start to get hot and then go cold. When I put my hand to the outlet pipe it is very hot at first' then goes to warm. Im stumped with this one.

Sparkpea

most valves today are 2 way so it doesn't matter whether flow is on the right or left, unless perhaps its a one pipe system.

anyway - did the old rad not heat up at all or why did you change it? are you sure when bleeding the new one that one side was not hot (as the flow) and the other side cold (return) as cold water was still being filled into the system from bleeding it?

also you shouldn't really bleed the system with the heat on its not good practice

reggaeman

The old one would not heat up fully and never got hot. so i just decided to replace it. Before I turned the heating on I made sure the tank was full. It had stopped filling. It is a two pipe system.
I didnt know I had to bleed the system from cold. Would it be best for me to start all over again. I havent tested the heating again since yersterday.
Thanks

Sparkpea

nah starting from scratch wont make much of a difference, as said in the other thread its a possible blockage in the pipe, or the water pump isn't pumping fast enough to heat all the rads.

turn off all rads upstairs, leave downstairs on and put the heating on for a good 60mins, see if your new rad heats up then.

its a trial and error thing here..

report back

reggaeman

Hi.
Thanks for your reply. I did what you said and the rad has heated up’ but not fully. The other two rads are very good and get quite hot.
The new rad is warm rather than hot. The bottom is only lukewarm. The fitting on the right gets quite hot and the fitting to the left is lukewarm. But a least we’re getting some ware. Hopefully not far to go.
Thanks.

Stove Fan

reggaeman wrote: »

Hi.
Thanks for your reply. I did what you said and the rad has heated up’ but not fully. The other two rads are very good and get quite hot.
The new rad is warm rather than hot. The bottom is only lukewarm. The fitting on the right gets quite hot and the fitting to the left is lukewarm. But a least we’re getting some ware. Hopefully not far to go.
Thanks.

Are both rad valves fully open? When the new rad was fitted the person while fitting PTFE tape over the rad valve threads didn't accidently block the entry to the rad.

Stove Fan:)

reggaeman

Stove Fan wrote: »

Are both rad valves fully open? When the new rad was fitted the person while fitting PTFE tape over the rad valve threads didn't accidently block the entry to the rad.

Stove Fan:)

Both are fully open' I did the PTFE myself on both sides and I made sure I started to wrap it from the second ridge in' just to make sure no strands hung over the hole.

heinbloed

As usual when works had been done on the heating system the system needs to be hydraulically adjusted.
Was that done?

reggaeman

heinbloed wrote: »

As usual when works had been done on the heating system the system needs to be hydraulically adjusted.
Was that done?

Sorry! I dont understand. What would hydraulically adjusted do and how
is it done.

heinbloed

The hydraulic adjustment or balancing means as a result your radiators will show a matching temperature at the outlet.

See here for example:

http://www.homebuilding.co.uk/feature/how-balance-radiators

http://diydata.com/projects/centralheating/balancing/radiator_balancing.php

http://www.shadlock.co.uk/energy/heat/chbal.htm


If not done the radiators next to the thermal source (boiler) will 'rob the heat' from the circuit, the radiators furthest away from the boiler will get less heat.

reggaeman

heinbloed wrote: »

The hydraulic adjustment or balancing means as a result your radiators will show a matching temperature at the outlet.

See here for example:

http://www.homebuilding.co.uk/feature/how-balance-radiators

http://diydata.com/projects/centralheating/balancing/radiator_balancing.php

http://www.shadlock.co.uk/energy/heat/chbal.htm


If not done the radiators next to the thermal source (boiler) will 'rob the heat' from the circuit, the radiators furthest away from the boiler will get less heat.

Thanks for that. Will get Digital thermometer and have a go. Otherwise as the termonator says' Ill Be Back.