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May be tough for me to find a manual on one this old.Can you send a picture of wiring diagram and unit?
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.
Possibly like this
Do you see a limit with with a set point of between 200 and 250 with 2 wires going to it in the circuit to gas valve?