Yes, the wiring diagram for the Photon 10-120kw unit heaters is available here: https://www.reznor.co.uk/wp-content/uploads/2025/09/PH45-001-D-Photon-010-120-1PH-MOD-OP952.pdf.
Is there a wiring diagram available for the Photon?
Information on wiring diagrams for Reznor products