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  1. #1
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075

    McQuay MicroTech II

    Does anyone know what DC voltage is for temperature sensors on MicroTech controller-Typical is 0-5 for most. I had one this week only develop 3.78vdc with the sensor disconnected. The chiller thought it was making 44 degree water when in reality it was really making 60 degree water. I love the sensor on the brazed plate evaporator on the AGZ product.
    It might get loud!

  2. #2

    McQuay MicroTech II

    Analog Inputs
    # Description Signal Source Range
    1 Reset of Leaving Water Temperature 4-20 mA Current 0 to10 degrees
    60°F max inlet
    2 Evaporator Refrigerant Pressure 0.5 to 4.5 VDC (NOTE 1) 0 to 132 psi
    3 Condenser Refrigerant Pressure 0.5 to 4.5 VDC (NOTE 1) 3.6 to 410 psi
    4 Leaving Evaporator Water Temperature Thermister (10k at 77°F, 25°C) -58 to 212°F
    5 Outside Ambient Temperature Thermister (10k at 77°F, 25°C) -58 to 212°F
    NOTE 1: Value at the converter board input. Value at the converter board output is 0.1 VDC – 0.9 VDC.

  3. #3
    Join Date
    Jul 2009
    Location
    In a mechanical room....
    Posts
    1,888
    Quote Originally Posted by duke of earl View Post
    Does anyone know what DC voltage is for temperature sensors on MicroTech controller-Typical is 0-5 for most. I had one this week only develop 3.78vdc with the sensor disconnected. The chiller thought it was making 44 degree water when in reality it was really making 60 degree water. I love the sensor on the brazed plate evaporator on the AGZ product.
    Is it the sensor that is like bulb with some duct tape holding it to the plate?

    “It takes courage to grow up and turn out to be who you really are.”

    - E.E. Cummings

  4. #4
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075
    Anyone?
    It might get loud!

  5. #5

    McQuay MicroTech II

    The MT II uses 10K NTC thermistors. I saw the voltage reference and quoted you the pressure transducers in the last post. I attached the resistance scale for your use.
    Attached Files Attached Files

  6. #6
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075
    Need2Chill,

    I need to know what dc voltage is used for the LWT sensor. The data you provided did not include that information. Thanks for the chart.
    It might get loud!

  7. #7
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075
    I wish McQuay would include the dc values next to the temp/resistance on that chart like most everyone else does.
    It might get loud!

  8. #8
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,092

    Talking

    Quote Originally Posted by duke of earl View Post
    I wish McQuay would include the dc values next to the temp/resistance on that chart like most everyone else does.
    yeah., from what i understand , mcquay is not too helpful with their technical info on their machines

  9. #9
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,610
    Quote Originally Posted by mlkwal1 View Post
    yeah., from what i understand , mcquay is not too helpful with their technical info on their machines
    They're no different than most others. You almost need to have worked for one of the factory service groups to understand how much info is out there, but not available to private service organizations. It really is a cryin' shame that they all want to sell parts for 5 times what they're worth, but then refuse to support the folks that put food on their table by buying them.

  10. #10
    Join Date
    Oct 2006
    Location
    Central Texas
    Posts
    633
    Did you call your local McQuay office? I'd agree they may not be too helpful, have you tried calling Staunton, VA? I've gotten some good support from some of their guys there.
    Sic Semper Tyrannis.

  11. #11
    Hi, Would you know the 10 digit super user password ? Paul

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