The following installation manuals are available for the PK-N range:
Nordair PK-N - Installation Manual - June 2005 - https://www.reznor.co.uk/wp-content/uploads/2023/12/Nordair-PK-N-Installation-Manual-EN-2005-06-GB-NOR-030-0605.pdf
Nordair PK-N - Installation Manual - September 2006 - https://www.reznor.co.uk/wp-content/uploads/2023/12/Nordair-PK-N-Installation-Manual-EN-2006-09.pdf