Download instructions and guides to many Dayton products, including various models of heaters, at ManualsLib.com. You can view the .PDF file on the website before downloading it to ensure you have the correct one.
Navigate to ManualsLib.com and search for products from the Dayton brand. Scroll down until you find the type of product for which you are looking. Find the model number of the product, then click the Operating Instructions and Parts Manual link. After you open the PDF, click the Download button near the top of the page to save a copy of the manual to your computer.