[DeTomaso] [NPC] Thermocouple

[Mark McWhinney]

I have a couple of thermocouples and a limit switch (a one-shot thermal
fuse).

I was hoping that there would be a simple continuity type test that I could
run to check out the thermocouples, but that does not look like that is the
case.

As it turns out, the limit switch failed the continuity test, so I'll
trundle off to the local appliance shop with $10 for a new switch and hope
that does it.  Kudos to local dryer repairman and real estate mogul, Peter
Kovacs, for the diagnosis tips.  Ditto for Greg Landwehr.



-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Larry - Ohio Time Corp.
Sent: Wednesday, February 07, 2007 7:18 PM
To: Mark McWhinney; detomaso at realbig.com
Subject: Re: [DeTomaso] [NPC] Thermocouple

Hi Mark,

I do not think they act as a heat switch at all. From what I recall they are

made of two different metals. When heated they produce a small amount of 
power. This is what then opens the gas valve.

I just found this  http://www.hvacwebtech.com/thermocouple.htm


Larry (clothes lines cost less then thermocouples) - Cleveland


----- Original Message ----- 
From: "Mark McWhinney" <msm at portata.com>
To: <detomaso at realbig.com>
Sent: Wednesday, February 07, 2007 10:07 PM
Subject: [DeTomaso] [NPC] Thermocouple


> This way off topic, but maybe someone has a quick answer.
>
> I am chasing an electrical problem in a clothes dryer.  It appears that 
> one
> of the two thermocouples is bad, but I want to confirm before running off 
> to
> replace them.
>
> I assume that at room temperature that the thermocouple is open (no 
> current
> flows) and at the trigger temperature, the thermocouple closes (current
> flows).  Is that correct or backwards?  I poked around on line, but I 
> could
> not find a definitive answer.
>
>
>
>
>
>
>
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