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Posted by HeatPro on January 19, 2006 at 10:11:19:
In Reply to: Re: Heatmanager vs Honeywell T475A posted by Dave on January 19, 2006 at 08:15:36:
The wiring is putting the Heatmanager 24 volt switch in the wire to the high limit, so the burner is turned off when the Heatmanager senses that the water temperature was enough. The X in their sketch denotes breaking the wire there. The wire doesn't physically have to be broken - the one wire is removed from the hight limit terminal going to the burner, one red wire of the Heaatmanager attached to the removed wire and the other yellow Heatmanager wire attached to the terminal the wire was removed from.
http://www.becketthm.com/pdf/Installation_Instructions.pdf
The diagrams are clear about wiring the differing Honeywell model numbers.
The HeatManager might be the better control in this application because it doesn't insist on turning off the burner in the summer and it makes no difference what the outdoor temperature is, just the burner on and off times to maximize economy. Internal zone demands would have less impact as the HeatManager is just concerned with appropriate burner on times. I estimate that the HeatManager is a better control for your configuration, it does as intended and lets you leave the existing control setup.
Set the Ergomax to the minimum temperature needed for the hot water demand and condensation prevention - 140F?, see by watching - and then let the zone thermostats through the RS504 demand the burner and circulator as they are now wired.