Limit Wiring


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Old 09-14-06, 04:18 PM
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Limit Wiring

I had a new beckett AFG burner installed with a R7184B controller. The system is hydronic. The old stack relay has been removed (RA117A). The guy wired the burner to the old connections from the service shut off. The aquastat is connected to the 2 TT terminals. Nothing is connected to the limit terminal on the burner controller.
My question is should there be another connection to the limit at the controller or does the CAD cell serve the as the safety limit? He is coming back tomorrow to fire the burner.
Thanks,

Lou
 
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Old 09-14-06, 04:24 PM
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Limit wiring

Which aquastat are you using? Usually the aquastat has a built in limit but to be sure, the number of the aquastat would be a big help.
 
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Old 09-14-06, 04:49 PM
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It is an immersion type, limit set at 180. model 650 E1
the number is hard to read
 
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Old 09-14-06, 05:01 PM
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Limit

Sorry that number isn't familiar but the burner must be wired thru some kind of limit.
 
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Old 09-14-06, 05:09 PM
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Previously the aqustat was wired to the tt terminals on the RA117A if that is any help. My real question is, if the burner shuts of when the aqustat hits 180, is that, in combination with the cad cell, enough, or should something else be wired to the limit terminal on the new controller?

Lou
 
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Old 09-14-06, 06:11 PM
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Limit

The cad cell is a flame failure safety to shut off the burner if it does not fire. I suspect, not sure, that the aquastat you have is an operating limit. There should also be a secondary "high" limit.
 
 

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