HVAC / Refrigeration Controllers
Installation Guide for Danfoss MCX 15b Controller
A comprehensive installation and replacement guide for the Danfoss MCX 15b pre-programmed controller for IPS 8 systems. Includes essential safety procedures for depressurizing ammonia systems, wiring diagrams for upper and lower levels...
Table of contents
Manual images
Click an image to enlargeImportant Information for Installation
This guide covers the replacement and installation of the pre-programmed MCX 15b controller for IPS 8 systems. The unit is plug-and-play ready, but specific safety procedures must be followed before disconnecting the old unit to ensure the ammonia system is depressurized.
Safety and Preparation
Before disconnecting and removing the old MCX controller, you must depressurize the ammonia side of the purger unit. Follow these steps carefully:
- Close all supply lines from the purge points of the ammonia system (marked as 'a').
- Restart the controller to force pump-down.
- Wait for 20 minutes.
- Stop the compressor by turning the compressor switch QM1 to the off position.
- Close the SVA shut-off valve in the drain line located under the IPS8 (marked as 'b').
- Release the remaining system pressure to ambient pressure by opening the SNV drain valve (marked as 'c'). Alternatively, attach a permanent magnet on the AKVA 10 valve for forced opening.
Replacing the Controller
Once the system is depressurized and safe:
- Locate the rail lock on the controller.
- Pull the rail lock to release the controller from the suspension rail.
- Unplug all connections from the old controller.
- Plug all connections into the same sockets on the new controller.
Wiring and Connections
Refer to the wiring diagrams provided in the manual for precise connection points:
- Controller Upper Level: Refer to the upper wiring diagram for connections regarding Analog Inputs, Digital Inputs, and Digital Outputs.
- Controller Lower Level: Refer to the lower wiring diagram for connections regarding Digital Outputs, Analog Outputs, RS485, and Power.
Configuration
After installation, perform the following configuration steps:
- Switch QM2 to the on position.
- Configure the number of purge points. Refer to the IPS 8 user guide to activate the multipurger (label y02) and enter the number of purge points.
- Configure any other customer-specific settings if applicable. The pre-programmed MCX15B (code 084H5052) is plug & play ready, so only specific custom values need to be entered.
Manufacturer information
Danfoss A/S
Practical help
Common problems
System pressure remains high during removal
Ensure the ammonia system is fully depressurized by following the 6-step safety procedure, including opening the SNV drain valve.
Controller cannot be removed from the rail
Ensure you are pulling the rail lock mechanism to release the controller from the suspension rail.
Before use
- Ensure the ammonia system is depressurized.
- Close all supply lines from purge points.
- Stop the compressor using switch QM1.
- Close the SVA shut-off valve.
- Verify all wiring connections match the original controller layout before powering on.
Specs in practice
- Code 084H5052
- The specific pre-programmed version of the MCX 15b controller.
Images and diagrams
- Fig 1: Safety procedure for depressurizing the ammonia system.
- Fig 2: Rail lock mechanism for removing the controller.
- Fig 4: Wiring layout for the controller upper level.
- Fig 5: Wiring layout for the controller lower level.
Model compatibility
- Designed specifically for IPS 8 systems.
- Requires configuration of purge points via the IPS 8 user guide.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.