Thermopile question


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Old 10-14-15, 11:48 AM
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Thermopile question

My Thermoplie ( GNDC30 ) is outputting .250 V, does anyone know if this is enough to allow the ROBERTSHAW MODEL 7000 GAS VALVE to operate?




Separated from..... http://www.doityourself.com/forum/fi...or-gndc30.html
 

Last edited by PJmax; 10-14-15 at 08:10 PM. Reason: started new thread
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Old 10-14-15, 05:10 PM
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Welcome, Rick to the best DIY forum on the Internet.

It is always best to start a new thread for a new problem rather than "piggy backing" onto an existing thread, even if the problem is similar. Hopefully a moderator will do this concerning your problem.

Your Thermopile should output 750 millivolts so you are outputting only a third of the proper output. It is unlikely that low of a voltage will properly operate your gas valve. Like the thermocouple problem it is often a matter of a dirty pilot burner not having a sufficient flame AND fully engulfing the Thermopile that is the real problem.
 
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Old 10-14-15, 07:49 PM
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I see Furd welcomed you aboard. I started a new thread for you.

Name:  7000mv.JPG
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Although the specs. show it needs at least 100mv to open the valve.... the pilot generator circuit usually generates voltages well above that. A weak pilot is the biggest cause of low output voltage.

I'm trying to locate the Heatilator specs.
 

Last edited by PJmax; 10-14-15 at 08:11 PM.
  #4  
Old 10-15-15, 05:48 AM
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Thanks guys, took the glass out, what a dirty mess, here's the pilot, what do you think. Name:  Holiday-1.jpg
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Cleaned the pilot assy, got the voltage up to 280 mV, unit will now light...

2 hours later the voltage droped to 245 mV, unit will not fire up, I'm thinking replace the Thermopile...
 

Last edited by RickSpencer4; 10-15-15 at 08:31 AM.
 

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