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Tool Talk Discussion Forum

O/T Hot water heat

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old timer in oh

11-26-2007 13:32:10




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I know where's the tractor? There I said the magic word. Seriously I've got this problem.My boiler gets up to the proper temperature,but the pumps,only run about 1-1/2 to 3 mins,then shut off.I think they should run a lot longer than that,to get the hot water up to the third floor (its a BIG old house)it did last year.I've bled all the radiators of air,don't know what else to do!!! Any help will be deeply appreciated. Bob
God Bless

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dave guest

12-01-2007 18:31:13




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 Re: O/T Hot water heat in reply to old timer in ohio, 11-26-2007 13:32:10  
Circulator pump should run according to setting(adjustable)on stat which senses boiler temp. There are variations. How old is system? Is high temp stat shutting unit down? Mine is 40 years old and circulator is independent of anything except water temp. Even runs with zone valves closed. This is normal I was told by engineer.



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El Toro

11-28-2007 16:35:59




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 Re: O/T Hot water heat in reply to old timer in ohio, 11-26-2007 13:32:10  
I think those circulators will quit circulating if the water isn't hot enough. You may need to set the water temp higher. Hal



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kwright

11-27-2007 16:56:21




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 Re: O/T Hot water heat in reply to old timer in ohio, 11-26-2007 13:32:10  
There is probably a relay between your thermostat and the pump(s). When the thermostat calls for heat, it sends a signal to the relay which actually pulls the pump on. When the thermostat is satisfied, it tells the relay to turn off the pumps.

If things appear to not be working as you've come to expect, I'd suspect the relay first, then the thermostat. As your pumps appear to be working, I'd look further upstream to the control system.

These statements are made assuming you've not had any work done to the system recently, such as reconfiguring or similar work that may have had other unintended consequences, such as introducing air in the system.

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johnlobb

11-26-2007 17:11:05




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 Re: O/T Hot water heat in reply to old timer in ohio, 11-26-2007 13:32:10  
For help with this, go to heating help.com and go to the "wall" and post your question. This site is filled with wet heat heating pros. Good luck...John L....



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mjbrown

11-26-2007 15:24:36




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 Re: O/T Hot water heat in reply to old timer in ohio, 11-26-2007 13:32:10  
What switches you pumps on and off. Mine is done with the thermostat. The pumps run until the thermostat is happy. Thermostats have a temperature offset (historasis?) that requires the temp to raise afew degrees before it turns off so that it won't sit at a temp and turn the pump on and off, on and off. Maybe your thermostat is the problem, or where it's located. If it's where it gets a quick blast of heat when the pump comes on it could turn it off too soon. Turn it up 5 degrees and see if the pump still does the same thing.

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budn

11-26-2007 14:40:36




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 Re: O/T Hot water heat in reply to old timer in ohio, 11-26-2007 13:32:10  
My shop in floor heat needs 10 to 12 psi in the system or the pump won't kick in.
Bud



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