Let me know if you need anything else, this is a link you can download.
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Is there a service/troubleshooting manual available for this old unit?
I looked all over and that was all the information i could find.
However if your having a problem with keeping the pilot on here are a few things to try.
First, make sure your cap in on ( look on the roof) secondly this unit probably have a single burner gun. Turn power and gas off and take the gun assembly out. You will see the pilot assembly,they get plugged up and don't put a good flame on the thermocouple. When you take the assembly out there is a small orifice in the assembly you might have to tap on it to get it to come out. Use a very small piece if wire or needle to clean it. ( don't make it bigger. Replace thermocouple if you have not done that.
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Thanks for looking for the manual. I've maintained Modine natural/LP unit heaters in the greenhouse industry for past 25+ years so I'm familiar with pilots, thermocouples, etc. and I'm getting a great pilot flame which is impending on the thermocouple as it should. I'm hoping that there isn't a crack somewhere in the firebox that I haven't yet been able to find.