boiler not circulating hot water


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Old 12-12-08, 08:10 PM
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boiler not circulating hot water

hi everyone, I'm new to this, but thought someone can help. I have a boiler and it seems the water is not circulating to all the rooms. Only 2 radiators is working (the ones closest to the boiler).. All the valves are open, and I bleed them. It seems the water is passing through the radiators, but it is not warm. I think the PSI is set to 8, Is this right? or should it be 12?

Also, what is the right way of bleeding the valves? Starting from all the way on the top valve (furthest away from the boiler?)

thanks for your help.
 
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Old 12-12-08, 09:57 PM
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Yes start at the top and work down to low. The best way to bleed the system is call for heat so the system is pushing water. Now you have pressure to push the air out. The valves on the raditors are adjusted when the system is put in new to "balance" the heat in each room. These valves can corrode inside and restrict the flow. How high or far away are the other radtiors? And does your circulator actually work. The raditors closes to the boiler may just be gravity heat thats heating them and the cicurlator is not good. 8lbs pounds is good but try 10lbs. I just installed a 310 BTU boiler for a 7 unit and needed 40 lb to rise to top. Its very basic no water, water pressure, or restriction, no heat. Little water little heat. I asume its an old building. do you have old cast pipes and look to see if you have a decitated feed and return line. Or you have copper lines and the raditors feed and return on the same line if so. One possible problem is at those copper Ts the arent working right. On a copper system the Tee looks like a regular tee but its not. It a ventura Tee. This partiallt restructics the loop flow and sends water off the main loop to that radiator. When you bleed with the bioler on it should be strong on the bleed with the curculator on. Also check your automatic fill valve that feed the system. Just because you have 8 lbs at the boiler doesn't mean the system is filled all with water. Hope this helps.
 
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Old 12-13-08, 01:51 AM
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Originally Posted by 21boat
How high or far away are the other radtiors? And does your circulator actually work. The raditors closes to the boiler may just be gravity heat thats heating them and the cicurlator is not good.
It is about 15 feet away, but with two rads.
Originally Posted by 21boat
And does your circulator actually work.
Is there a way to check? The pump was changed a few years ago, and it seems to be good.

Originally Posted by 21boat
8lbs pounds is good but try 10lbs.
adjust the regulator with a screwdriver while the system is on?

Originally Posted by 21boat
do you have old cast pipes and look to see if you have a decitated feed and return line.
It is old cast pipes, and I can hear the water going in. Maybe it is not filled?

Originally Posted by 21boat
When you bleed with the bioler on it should be strong on the bleed with the curculator on. Also check your automatic fill valve that feed the system.
The water valve is open and it seems water is going in. is the fill valve near the gauge?

Thanks for your help, will try in the afternoon.

Cheers
 
 

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