I found the installation manual for several Dayton gas heaters, including the 4LX62, at Grainger:
https://www.grainger.com/product/DAYTON-Gas-Unit-Heater-4LX62 . The direct link to the manual is currently
https://www.grainger.com/ec/pdf/4LX68_1.pdf . Since this is a 250,000 BTU unit, the wiring diagram 5C on page 11 is the one appropriate for your unit.
I hope this helps. I could not find separate documentation for the A suffix heater. The suffix may indicate a minor difference (for example - manufactured at a specific facility) and thus the 4LX62 manual is still appropriate.
Cindy Wells
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