45 MBCA Ductless Unit and the “CP” Error Code
June 12, 2025
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Most ductless products have all of the error codes listed in the installation and service manuals. Error codes listed in
Have you seen an ABB Variable Frequency Drive or VFD for short?
Odds are if you have installed or serviced a light commercial HVAC system in the last few years then you have come across one of these drives. The first thing you will notice is that the VFD does not come with a key pad because under normal operations a keypad is not needed. Test and balance DO NOT need this keypad and they should make airflow adjustments with the sheaves on the motor.
Keypad Assistance?
When you first plug in the keypad it will prompt you for assistance. Choose “No”. The drives already have a program in them and they need a few parameters to be set. If assistance is chosen, it will make changes to the programing of the drive. If “yes” is chosen for assistance then you have to go to parameter 9902, change it to something other than HVAC and save it. Then edit the parameter back to HVAC and save it again. Go to parameter 1611 and select “Long View.” After that you can proceed with the parameter setup.
ABB VFD Models
Carrier/Bryant is utilizing two different models of the ABB brand drives on the light commercial platform: ACS320 and ACH550.
There are also two different Keypads: ACH-CP-B and CAR-CP-H.
The CAR-CP-H ONLY works on the ACH550.
The ACH-CP-B works on BOTH drives and is the newest keypad.
Your keypad model can be found on the back.
After a drive has failed and has been replaced you have two options when it comes to setting up the drive: Upload/Download or Manual Parameter Setup.
To UPLOAD:
Turn off- Press bottom left button
Menu- Press top right button
Par back up / Press enter on top right
Upload to panel—Press SEL top right
When finished: Press OK on top left
Press Exit on top left (press 2 times)
Turn back to auto (Press round button)
To DOWNLOAD:
Turn off– Press bottom left button
Menu– Press top right button
Par Back up / Press enter on top right
Download full set– Press SEL top right
When finish: Press OK on top left
Press Exit on top left Press 2 times
Turn back to auto (Press round button)
To perform a manual setup, use the book that came with the keypad to locate the page with your unit model number on the top and choose the page that has the correct drive number and motor model number. Double check that the HP and voltage are correct. Use the parameter settings and proceed:
To Access Parameters:
Turn off- Press bottom left button
Menu- Press top right button
Parameters / Press enter on top right
Select desired category 01-99/ Press SEL on top right
Select Desired Parameter/ Press EDIT on top right
Make needed changes/ Press SAVE on top right
Go to next Parameter OR Press exit to choose another category
After completion Press Exit on top left Press 3 times
Turn back to AUTO (Press round button)
Helpful Hints:
Example: Parameters 9905 and 9906 will be in category 99
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