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  1. #1
    Join Date
    Mar 2018
    Posts
    74
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    Trane 550 Effective Setpoint headache

    Occupied cooling: 72
    Occupied Heating: 65
    Setpoint override : 68.5

    Effective setpoint: 73?????

    I'm looking at the cut sheet and it offers the following explanation for how the ESP is calculated:

    Steps to calculate default values to effective setpoints:
    1. Mean setpoint = (Occupied cooling setpoint + Occupied heating setpoint) / 2.
    2. Absolute setpoint offset = Setpoint input (73F) Mean setpoint.
    3. Effective occupied setpoint = Absolute setpoint offset + Default setpoint.
    4. Effective unoccupied setpoints are the same as the defaults.

    I've changed both setpoints (60 and 70, making the override setpoint 65) and the effective setpoint doesn't change from 73. The high and low limits are not really a factor, as they only restrict the wheel setpoint. Disabling the local setpoint changes the Override Setpoint, but it only has a limited effect on the Effective Setpoint. I can hardly get it to budge off of the 73 degree mark.


    Why, oh why has Trane made this so much more difficult that it needs to be? Does anyone know what the heck is going on with these setpoints?

  2. #2
    Join Date
    May 2009
    Location
    SC
    Posts
    2,177
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    Is there a MSV describing controlling setpoint source?

  3. #3
    Join Date
    Jan 2019
    Posts
    21
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    so based on what you said, this is what I get

    1. (72+65)/2 = 68.5
    2. 73 - 68.5 = 4.5
    3. 4.5 + I'm guessing the default is set at 68.5 (does this equal to override?) = 73 effective set point

  4. #4
    Join Date
    Jan 2019
    Posts
    21
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    for the second part

    1. (70+60)/2 = 65
    2. 73 - 65 = 8
    3. 8 + again you said override is 65 (equal to default?) = 73

    what values can you change?

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