second zone upstairs boiler not heating radiator


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Old 08-30-06, 03:15 PM
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second zone upstairs boiler not heating radiator

Hello,
I have a 2 thermostat system. THe boiler is working fine heating the downstairs(which is one thermostat), but not the upstairs. When I kick on the therm upstairs the boiler produces hot water for the upstairs sytem, but no heat on the 3 rad upstairs. Any ideas?
 
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Old 08-30-06, 03:34 PM
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I even just heard a bit of water going through the inside of one of the rad. Still no heat..............
 
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Old 08-30-06, 03:36 PM
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No heat upstairs

What is the pressure on the boiler? Have you tried bleeding air from the upstairs rads? If so, what was the result? Do you have zone valves or a circulator for each zone? If zone valves does that valve open & the circulator come on? If circulators does the upstairs circulator come on?
 
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Old 08-30-06, 03:47 PM
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Hi,
The pressure on the boiler is about 16-18. Im not sure how the system is circulated. I am able to follow the pipes all around the basment, and they are VERY hot, but for whatever reason not piping the hot water up to the 2nd floor. I havent tried bleeding the upstairs rads yet. Im guessing it has something to do with the circulator? What do I check to see if thats the case?
 
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Old 08-30-06, 08:27 PM
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can anyone help?
 
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Old 08-30-06, 08:54 PM
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Pipes hot

If the pipes are hot, there is a pretty good chance there is air blocking the flow of water. Try bleeding the rads & post back with results.
 
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Old 08-31-06, 05:57 AM
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Thanks Grady. Ill try that today and get back to you.
 
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Old 08-31-06, 06:20 AM
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Hey again.
I tried bleeding all 3 rads. each gave about 30sec of air letting out. I turned up the therm again, and no luck. The only place I am feeling hot pipes is downstairs. It is like the hot water on this system does not want to leave the basement. Plenty of hot water in the pipes, but I can't get it to get up to the second floor and warm my 3 rads. Ideas?
 
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Old 08-31-06, 04:32 PM
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Bleeding rads

After the air came out did you get a good steady stream of water? If you did, we have to move on to other possible problems. If not, is the boiler pressure still up?
 
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Old 08-31-06, 04:48 PM
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Hello,
After the air was done no water came out, the pressure is steady at around 16-18psi.

I bled the working zone today and water did come out.
 
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Old 08-31-06, 09:17 PM
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No water

The fact you got no water out of the rads tells me either the pressure is too low (maybe a bad gauge) or something else is blocking the flow. Try turning off the incoming water to the boiler then opening the boiler drain. If the gauge does not come down, the gauge is bad & you may have a bad reducing valve not feeding water as it should. Some pics of the boiler & nearby piping would help. You can post them on photobucket or other photo hosting web site & provide a link here.
 
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Old 09-01-06, 08:10 AM
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Hey again. The therms are each connected to a taco circulator.
Would pressure be a problem? The unit pumps just fine to the first floor, but zero to the second floor?
 
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Old 09-01-06, 04:10 PM
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Pressure

Pressure could be a problem but so could a malfunctioning circulator or relay. Do you have a volt meter, know how to use it, & not afraid to work on live electrical circuits?
 
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Old 09-01-06, 08:10 PM
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Nope don't have one, and not willing to use it in a live circuit. Any other ideas?
 
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Old 09-01-06, 08:46 PM
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Mattbau43, No Problem

Some folks just don't like 'letric. It can & will hurt you if you get sloppy or are just nervous about it. Been there, done that.
To check if the circulator is running, turn the thermostat for the problem zone up while having all others all the way down. Using a screwdriver as a stethascope (sp?) put the blade against the motor of the circulator (round part away from the pipes) & the other end firmly against your ear or the bone just in front of the ear. If you hear a "whirring" sound we know the circ motor is running. To eliminate other boiler sounds it helps to allow the boiler to come up to max temp & the burner shut off. Let me know.
 
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Old 09-03-06, 06:59 AM
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Ill try it today and get back to you.
 
 

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