Carrier 50NC Series - User Manual

Other manuals for Carrier 50NC Series

Installation, Operation And Maintenance Instructions44 pages

Questions and Answers

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Stephen CastilloAug 11, 2025
What to do if my Carrier Air Conditioner LCD has strange characters or a blank display?
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  Kristy KingAug 11, 2025
  If your Carrier Air Conditioner's LCD shows strange characters or a blank display when switching on, check the following: 1. That the software in the flash is correct. 2. The addresses of the ?PC3 control board and the Graphic terminal (check that they comply with the requirements of the current application). 3. The connection between the Graphic terminal and the ?PC3 board.
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rachelrichmondAug 20, 2025
What to do if there is an unusual alarm signal from the digital input of my Carrier 50NC Air Conditioner?
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  mitchell46Aug 21, 2025
  To troubleshoot unusual alarm signals from the digital input of your Carrier Air Conditioner, check if the alarm signal is present at the input. Measure the voltage between the 'IDC' common terminal and the digital input terminal which indicates the alarm 'IDn'. If voltage is present (24 Vac or Vdc, depending on the power supply used for the digital inputs), the contact of the connected alarm device is closed. If the voltage is near 10 Vac or 10 Vdc, the contact is open.
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Jose HahnAug 30, 2025
How to troubleshoot erroneous readings of the input signals on a Carrier 50NC Air Conditioner?
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  janet29Aug 30, 2025
  To troubleshoot erroneous readings of the input signals in your Carrier Air Conditioner, check the following: 1. The correct power supply to the control board and probes. 2. The separation between the power supply of the digital inputs and that of the control board. 3. That the cables from the probes are connected according to the instructions. 4. That the probe cables are located far enough away from possible sources of magnetic interference (power cables, contactors, high voltage cables or cables connected to units with high current peaks). 5. That there is not a high level of heat resistance between the probe and the sensor cap (if present). If necessary, apply conductive paste or oil into the caps to ensure good temperature transfer.