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Tool Talk Discussion Forum

OT hot water heat question

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amertrac

01-20-2008 09:03:53

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i have a zoned hanging space heater in my basement the aquastat is set 125 only one setting in stat the heat comes on when called for the fan comes on when hot the fan continues after the heat reaches set blowing cool air. is there any way to prevent this, thank you

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dave guest

01-23-2008 17:10:15

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Re: OT hot water heat question in reply to amertrac, 01-20-2008 09:03:53

T bone you said something about not posting under Joe's comments. How do you control where your post is going? I don't know nothing about this. Please and thanks.

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T_Bone

01-20-2008 09:44:02

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Re: OT hot water heat question in reply to amertrac, 01-20-2008 09:03:53

Hi amertrac,

The typical fan circuit operates off a stat on the heat exchanger at line voltage, not on the room T-Stat (low voltage). The room T-stat only controls the main gas valve on/off. On fan stats, some are adjustable, some are not.

If the unit was working just fine before, then the fan stat needs replaced. Careful here as the high limit SAFETY stat looks the same as the fan stat but works on a different temperature setting.

T_Bone

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amertrac

01-20-2008 10:35:54

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Re: OT hot water heat question in reply to T_Bone, 01-20-2008 09:44:02

thanks it is an old aqastat that clamps to the return pipe, i think i will get a new one that has two settings on and off. bob w

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T_Bone

01-20-2008 10:44:17

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Re: OT hot water heat question in reply to amertrac, 01-20-2008 10:35:54

Hi Bob,

I was just trying to point out that heating units can be wired many different ways and not trying to disprove what Joe said and is why I didn't post under Joe's comments.

Another question that the internet just can't answer correctly as there's too many considerations depending on how the unit is wired.

T_Bone

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amertrac

01-20-2008 11:12:33

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Re: OT hot water heat question in reply to T_Bone, 01-20-2008 10:44:17

T Bone, the 110 circut to the fan is wired to the aquastat only . it works off the heat of the return of the zone .it is seperate from thermostat .i have had this aquastat for a number of years as well as several uses i beleive it is time for retirement.thanks again bob w.

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Joe in MN.

01-20-2008 09:15:34

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Re: OT hot water heat question in reply to amertrac, 01-20-2008 09:03:53

Disconnect the Thermo switch to the fan ( which means ) remove the thermo switch and let the fan run off the Thermostate only ...

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amertrac

01-20-2008 09:36:49

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Re: OT hot water heat question in reply to Joe in MN., 01-20-2008 09:15:34

that would mean installing a new transformer on that zone right?

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Joe in MN.

01-20-2008 11:07:48

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Re: OT hot water heat question in reply to amertrac, 01-20-2008 09:36:49

T_Bone is Right --- it all depends on how it's wired -- simply use an Ohm-meter and check the voltage --- it can be Low or High Voltage --- so you want to get that right ....

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