The following installation manuals are available for the RHC range:
RHC 4000 - Installation Manual - https://www.reznor.co.uk/wp-content/uploads/2023/12/Reznor-RHC-Installation-Manual-4000-DJL-EN-2019-04-D301155-Iss-C.pdf
RHC8000 - Installation Manual - https://www.reznor.co.uk/wp-content/uploads/2023/12/Reznor-RHC-Installation-Manual-8000-DJL-EN-2019-04-D301207-Iss-C.pdf