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    Jon Corelis's Avatar
    Jon Corelis Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 18, 2005, 07:51 AM
    One or two transformer system?
    I am replacing my White-Rodgers 1F76-357 thermostat, but I need to know whether I have a one or two transformer system.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Oct 18, 2005, 08:58 AM
    2 transformer systems are usually more complicated systems, often one where additional devices were added later. As for identifying one, I guess looking around the system for a second one, or additional wiring, and comparing your existing wiring to the examples in the directions for the new thermostat.

    I do not understand the need for a second transformer in most cases. Since you don't run the heating and A/C at the same time, most transformers will have the capacity to run one or the other at a time.
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