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Frequently asked questions

What should I do when my system manager’s offline alarm is triggered?

Perform a rescan at the system manager, which will force the controller to scan for the offline devices. If that doesn’t solve the problem, perform secondary checks, including proper EOL termination of the loop and power at the offline devices.

Can I use a volt meter on the comm loop to help identify communication issues?

No, only an oscilloscope will supply proper information showing the quality of the signal on the comm loop.

I’m replacing an AK-SC 255 with an AK-SM 800. Which part number should I use when ordering?

Part number 080Z4009 is the retrofit version of the AK-SM 880, with native LONTP78 communication. Additional part numbers can be found here.

How do I configure a new AK-CC 210?

Watch our video for an introduction to AK-CC 210 functionality. 

My case controller has three icons flashing on the left side of the display. What does this mean?

Flashing icons indicate an alarm condition. For details on what the alarm indicates, press the top button of the case controller for the alarm code. Additional details can be found on the KoolCode app or in paperwork included with the case controller.

I just installed a new case controller and it will not call for refrigeration. What’s causing this?

Think of parameter r12 as the main switch for case control, so it needs to be set to the “On” position before operation will begin (when set to “Off,” alarm code A45 will be active).

My case controller shows “-d-“ on the display but is not defrosting. What does this mean?

The case controller will continue to display this during the pulldown phase until the case has reached its cut-in temperature.

How do I set the address in a case controller (including AK-CC 210, 525A, 550A, and EKC 202D2)?

Press and hold the top button for 5 seconds or until r01 is displayed. Next, use the top button to navigate to “o03.” Then, press the “Set” button and change address from 000 to desired address using top button. When complete, press “Set” button again.

Can the AK-SC 255 communicate with all AK2-style of IO?

Yes, however for the AK-XM 103A (4AI/4AO) module, firmware version v2.101 or higher must exist in the controller.

I’m getting an “unable to locate compatible Win55 file” error whenever I try to connect to my site. What’s causing this?

Each 255 version requires a matching file on your PC. Previous versions can be found here.

More documents

Need more assistance?


  • Product photo of the AK-PC 551 pack controller by Danfoss
    AK-PC 551 pack controller

    AK-PC 551 is used for capacity control of compressors and condensers in medium sized refrigeration systems and covers applications with one or two suction groups and a condenser.

  • Product photo of the AK-CC 550 case control by Danfoss
    AK-CC 550

    AK-CC 550 is a flexible case/room controller. AK-CC 550 features energy optimization of the complete case and predefined application types for quick adaptation to different cases or cold room setups.

  • Product photo of the AK-SM 800 Series of system managers by Danfoss
    AK-SM 800 series

    System managers are system components for use together with controllers in ADAP-KOOL® Refrigeration control systems. System managers enable the construction of complex control systems with alarm monitoring and data logging in connection with decentralized refrigeration plants.

  • Product photo of the AKVH electric expansion valves by Danfoss
    AKV electric expansion valves

    AKV are electrically operated expansion valves designed for refrigerating plants. The AKV valves are normally controlled by a controller from Danfoss’ range of ADAP-KOOL® controllers.


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