[DeTomaso] [NPC] Thermocouple

[Larry - Ohio Time Corp.]

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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