AddisonSedergren

Hey, I have a Duncan Energy Saver, The Teacher kiln, Model No. ES 820-2. Its pretty old and my brother recommended that it should be rewired to a 4 prong 240 v cord instead of the 3 prong one that is currently attached for safety reasons and code. I would have a 240 50 amp receptacle installed on the wall. I'm just having a little bit of trouble figuring out how to properly rewire the 4 prong cord to the machine properly so that it will function and have a proper ground. Any help would be appreciated. I found a manual of the machine as well if that helps. https://aakilns.com.au/pdf/Duncan_Kiln_Service_Manual.pdf