The following installation manuals are available for the ER range:
Ambirad ER - Installation Manual - 1994 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-ER-Installation-Manual-EN-1994-131-10-94-02.pdf
Ambirad ER ER13 - Installation Manual - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-ER-Installation-Manual-ER13-EN-AR485.pdf
Ambirad ER ER22 - Installation Manual - August 1989 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-ER-Installation-Manual-ER22-EN-1989-08-AR883.pdf
Ambirad ER ER38 - Installation Manual - 1991 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-ER-Installation-Manual-ER38-EN-1991-AR285-103-06-91.pdf