---
title: "Exchange of relayCUE-8 in existing installation"
canonical: "https://docs.cuesystem.com/space/RUM/488669223/Exchange%20of%20relayCUE-8%20in%20existing%20installation"
format: markdown
---
There are two ways of **replacing **the relayCUE-8 unit in the existing installation:

1. The best way of making such an exchange is to replace the relayCUE-8 with the new one physically, and then make a change in project programming. As soon as the unit with the new UnitID is put in place of the existing one in the project, the only thing that needs to be done is go to the properties of the exchanged unit and enter the new UnitID there. The project then needs to be compiled and downloaded to the controller in the system.
2. The exchange described in the previous point is not always possible, for example, if project programming is missing, or if it is not possible to do a new compile and download. In these situations, you must know at least the Address and Bank of the replaced unit. If you know these parameters, you can just replace the unit in the system physically and set the Address and Bank parameters manually using the buttons on the front panel – as described in chapter [“](https://cue.atlassian.net/wiki/spaces/RUM/pages/489095201)**[Front panel description](https://cue.atlassian.net/wiki/spaces/RUM/pages/489095201)**[”](https://cue.atlassian.net/wiki/spaces/RUM/pages/489095201). After parameters have been set correctly, you must reset the controller in the system and all parameters will be renewed in this unit according to the settings in the original programming.

> ℹ️ To explain how the system works in such a situation:  
> ℹ️ The UnitID of this new relayCUE-8 in the installation is unknown to the currently running project and so the parameters Address and Bank remain unchanged (as explained above). All the remaining functions are based only on these Address and Bank parameters, so all the commands and system settings will be accepted by this new unit in the system, and the unit will act exactly as the replaced one, without the need for reprogramming.