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  1. #1

    Help on 4TEE DIP settings

    Hello, I'm hoping someone can help me with my setup. I had a 4TEE3F65B1000AA (5ton) handler with an XR15 (3.5 ton) condenser installed in my 1800 sf home about three years ago. We opted for the larger handler for the variable speed fan. i haven't had the velocities checked, but it seems to run at minimal fan speed with AC request and high speed for heat, regardless of the temperature difference. It was my understanding that it should run fairly low speed under either setting for a few minutes, then ramp up if there was need. I checked the DIP switches yesterday on the handler and they were still at the factory settings (x-x-x-x-o-x-o-x), x off, o on for positions 1-8.
    I changed 2 to 'on' to account for the 3.5 Ton condenser, and 5 and 6 on for Enhanced fan speed, which I assume should allow 50% initial, then ramp up. I was wondering if anyone can verify these settings or suggest others, my only other thought would be to run the heat fan at med-low speed (high is blowing far too much, runs for short times and is annoying to have blowing on you constantly when sleeping and otherwise).
    We live in Texas and the AC has worked OK to this point, but not great and not giving the cost saving we'd hoped for when replacing the 25 y/o 2.5-Ton unit. I'm hoping configuring to the 3.5 condenser will help. I also have the fan delay on the thermostat set to '0' (is this a problem since the handler is at 1.5m?).
    I can give more information if needed, but am a bit short on time right this moment.
    Thank you for any help!

    Justin

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    Wow, moved up a ton. It won't ramp up in heating mode.
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  3. #3
    The installer had told me it was 3.5-Ton inside and out, it wasn't until recently that I ran the model and found out just how large it was. Calcs were showing it needed a bit over 3-Ton, and the original equipment was undersized. It was a step-up on install from 3 to 3.5 for the variable speed as I was told.

    Are you saying it won't ramp up because it'll never need to? If so, I should be fine to change the DIP heater fan speed to low or med-low and not worry about the Enhanced speed so long as it's above the min CFM for the heating element correct?

    Thanks for the help!

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    They don't ramp up in heat mode.

    The 2.5 may not have been under sized. it may just have been your duct work that was the problem.
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    How many times must one fix something before it is fixed?

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