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Posted by HeatPro on January 22, 2006 at 10:53:22:
In Reply to: Re: The plot thickens... posted by Dave on January 22, 2006 at 08:38:11:
I prefer to follow the wiring diagram exactly, as shown in the picture; that way, the Heatmanager is powered from 115V which would prevent the possibility of overloading the 24 volt secondary with the additional control. It is best to follow the Beckett Heatmanager wiring diagram, the one on the last page on the lower right here:
http://www.becketthm.com/pdf/61580%20-%20Data%20Sheet.pdf
It shows the gray connected to the other secondary side of the transformer (Beckett calls it the 24 volt return, by the gray wire connection) not:
the yellow and red at the high limit going to the burner control circuit of the other transformer secondary.
It seems there might be a connector in the wire that goes from the low fire gas valve directly to the molex that is the secondary that the gray wire of the Heatmanager could use. It is marked R in the pictorial diagram.
The wiring diagrams are annoying because the ladder diagram doesn't show the wire colors, and the pictorial shows the colors; but makes it difficult to try to follow through the molex connectors. The Beckett wiring diagram saves money by not showing 115V and 24V wiring diagrams separately. It always seems 'footshooting' by making extra difficulty is important to factory technical writing staffs, so the installers have to increase the tech help-desk staff traffic. A wiring mistake here could cost big dollars.