zone too hot... - http://www.hvacmechanic.com/ Forums
Original message
| steeliekid
 |  "zone too hot..."
, posted Wed 12 Dec 15:50  
Old house with a new (less than 2 years old) hydronic, base board heat. 4 zones, Lux (511 serise)programable thermostats. One zone is running hot 72 deg (started a couple of days ago) when the thermostat is set @ 62. I switched thermostats (though kept the same baseplate) and still no change, so I don't think its a thermostat. Any ideas? Any and all info much appreciated.
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Replies:
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| djgilbert
| "Re(1):zone too hot..." , posted Wed 12 Dec 17:51
Are you using zone vales or circulator pumps with flo control valves on it. You may have a zone valve stuck. When you had the T-stat off did you check to see if you may have a draft where the wires come thru the wall, you may need to seal that up.
Don
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| | steeliekid
| "Re(2):zone too hot..." , posted Wed 12 Dec 21:01:
djgilbert - Thanks for the quick reply - circulator pumps for each zone. I unhooked the thermostat to see if the room would cool. About an hour later, I went down to the cellar and felt the pipe that services that zone, and it was cold. While I was standing there, a different zone went on, and a few minutes later after that the zone in question's pipe was hot. I put a screwdriver to the ear on the pump of the problem zone and it wasn't turning, though the other clearly was. Does this indicate a stuck valve as you mentioned? Is there an easy fix or should I call in a pro? As always, I'm very much appreciate any information. Thanks in advance.
also - no draft behind thermostat - it's mounted to a wall with the wire run up closet door trim...
[this message was edited by steeliekid on Wed 12 Dec 21:03] |
| | theduke03
| "Re(3):zone too hot..." , posted Wed 12 Dec 21:46
You should see some type of check valve in each zone. If a zone is getting hot and it's ciculator is not running, that suggests to me that a check valve is either stuck open or that zone is missing one.
You can't put a price on comfort! Be Safe.
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| | steeliekid
| "Re(4):zone too hot..." , posted Thu 13 Dec 08:44:
did some research - TACO flo-check valves/circulator pumps for each zone. I hand turned the flo-check thumbscrew and heard a distinct "clink" (I assume valve closing), and then turned back to the initial setting. Zone heating appropriatly now. What causes the valve to stick open??
[this message was edited by steeliekid on Thu 13 Dec 08:48] |
| | theduke03
| "Re(5):zone too hot..." , posted Thu 13 Dec 14:54
Anything with moving part can become stuck. If that thumbscrew was not screwed in all the way, that would leave the valve open.
You can't put a price on comfort! Be Safe.
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