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    jimbaines's Avatar
    jimbaines Posts: 1, Reputation: 1
    New Member

    Dec 3, 2006, 09:49 AM
    Totaline P474-1100REC
    How do I install the Totaline P474-1100REC with only a 2 wire system?
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member

    Dec 3, 2006, 10:59 AM
    Some thermostats may need a third wire to provide a common to power the thermostat. Otherwise, identify the wire that runs directly to the transformer and connect it to the R or RH terminal. Connect the other that runs to the gas valve to the W terminal.

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