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Author:
elegantny (NY)
I have a hot water system McLain CGA5 gold natural gas boiler with 5 zones controlled with a TACO circulator for each zone. One zone continually has a hot radiator even after I disconnected the thermostat. I was told to look for zone valves but I don't see any. Is the taco being used as a zone valve ? How should I troubleshoot this problem? Any help would be appreciated.
Thank you
Joe
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Author:
packy (MA)
some of the newer taco circulators have an internal flow checks.
see if the model number of the circulator is a 007IFC.
if so the problem is it is sticking. it is easily replaced but you must remove the circulator to do it.
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Author:
hj (AZ)
I assume the pumps are on the return lines. If so, without "flow checks" on the feed lines there is nothing to prevent the water from circulating into the system, at least to the first radiation.
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Author:
greekguy7 (IL)
do u have 5 taco circulators and 5 thermostats? i have seen zone valves in bedroom closets, but that was in multifamily buildings.
do you see any flow-control valves on the supply side? one might be stuck open... tap it with a rubber mallet
Edited 1 times.
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Author:
elegantny (NY)
Do I have to change the whole circulator or just the flow checks?
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Author:
greekguy7 (IL)
first check if u have a taco 007... or a taco 007-ifc. check the label on it
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Author:
elegantny (NY)
To Greekguy
Yes 5 circulatory & 5 thermostats in a single family house.
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Author:
packy (MA)
just the flow check.
look carefully at this picture. see the white plastice object in the top of the circulator. that is the flow check. you grab it with a big needle nose pliers, twist it and it pulls right out. you may simply find debris in the flow check, clean it and put it back and be all set.
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Author:
elegantny (NY)
Packy
Thank you I will try that and keep you updated
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Author:
bernabeu (SC)
suffix "ifc" means internal flow check
==============================================
"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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Author:
elegantny (NY)
Packs
Finally had a chance to check it it is a Taco 007FS.Removed the unit no white plastic flow checks, removed the housing no internal parts serviceable it seems like a sealed unit.
Thanks
Edited 1 times.
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