The following installation manuals are available for the HM/EM range:
EM Heat Exchanger Module - Installation Manual - https://www.reznor.co.uk/wp-content/uploads/2023/12/Benson-EM-Gas-OandM-Jun2001-issue4.pdf
What installation manuals are available for the HM/EM?
Looking for the installation guide for your Reznor product? Have a look in here.