Is it possible to replace a Concord express system for a Qolsys Hardwire 16. If so do you have any support documentation to help with replacement?
Yes, you can reuse any standard hardwired burglary sensors with the Hardwire 16 and IQ Panel 4.
The steps to swap out the old panel are the same regardless of model for the most part. The installation guide is found here.
Qolsys has a video here showing the process (showing a large enclosure version, but both boards are the same.)