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Posted by HeatPro on October 15, 2004 at 17:08:30:
In Reply to: thermostats not working after new aquastat installed posted by Bob Ryan on October 09, 2004 at 05:32:18:
That is a 'depends' question. The zone valves can be powered by the internal transformer of some aquastats or might require a separate transformer. Follow the wires that come from the TR terminals or yellow wires of the zone valves to the transformer. One wire of the thermostat (usually an R terminal wire) will connect to the transformer.
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