honeywell 9000

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    Help With Adding on a New Thermostat

    I have a gas fireplace that is currently wired to a Millivolt thermostat, and it’s working fine. After reading multiple pages, guides, and suggestions, I decided to buy a 24VAC Model MGT2420 Transformer and a Honeywell R8845U Universal Switch. I have the transformer wired to L1 and L2. The gas...
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