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Posted by HeatPro on January 19, 2006 at 12:41:44:
In Reply to: Re: Heatmanager vs Honeywell T475A posted by Dave on January 19, 2006 at 12:19:39:
You'll leave the SR504 terminals where they are on the R W terminals and put the Ergomax thermostat across the same R W terminals just like the SR504. That way the Ergomax can maintain a minimum 140F temperature to prevent condensation summer and winter, independent of any call for heat or not.
Any zone can call for heat through the SR504; but the HeatManager, breaking the high limit circuit to the burner, prevents the boiler from overshooting and excessive cycling due to overlapping demand from the SR504. It's a good combination with the SR504.
The alternative, without the HeatManager would be:
Removing the R W wires from the SR504 when using the T475A to regulate water temperature on R W in the winter. The Ergomax wires to the R W take care of minimum condensation prevention and summer hot water needs. That would be roughly equivalent to what the HeatManager would do for you as wired in the paragraphs above this paragraph.
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