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    wilc's Avatar
    wilc Posts: 2, Reputation: 1
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    #1

    May 25, 2012, 04:14 PM
    Installing new thermostat
    In a multistage heat pump system the thermostat (Braeburn 1200 or 1200NC) has wiring terminals as follows:
    R O B C Y1 E/W1 G W2
    Currently there's a jumper between E/W1 and W2 (Exhaust and 2nd stage heat control)

    The thermostat I'm installing (Lux TX 9100E) has these terminals:
    A RH W2 RC G Y W1 O B C

    Any thoughts on how to handle the jumper in the new unit?

    One diagram I have shows the Heat Pump unit 24V going into Y with a jumper to W1 but this configuration has an auxiliary heat 24V going to W2, which I don't have.

    Another shows the Heater going to W1 and the AC to Y but this one has a separate transformer for Cool and Heat (going to RH and RC respectively).
    If I assume the Y line from my initial configuration is the AC transformer, this last setup makes sense. I just need to run a jumper from W1 to W2 to account for the 2 stages of heat.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    May 25, 2012, 07:46 PM
    How did the old one wire up? To me it looks like you should be able to match wire to post on each. You can add a jumper wire from W1 to W2. You will need a jumper from RH to RC.
    wilc's Avatar
    wilc Posts: 2, Reputation: 1
    New Member
    		  
    #3

    May 26, 2012, 08:59 AM
    Yessir, that's what we did.
    Now it seems like something's interrupting power to the outdoor unit. Prob'ly should've tested the transformer in the heat pump unit FIRST.
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