I am having promblems with getting the heat from an older Coleman Direct vent forced air furnace Model #7680a that's installed in a mobile home. The thermostat was replaced The fan comes on. The pilot feed that goes into the side but isn't attached. Do u have any specs on this model?

No but I know a site that specializes in Mobile home furnaces especially Coleman. Go to the link below sign in and post your question under Coleman.

Index page (http://www.mobilehomerepair.com/phpbb/index.php)

First reattach the feedline to the pilot light. You need to hold down the control until it lights and continue to hold it for a while to allow the thermocouple to heat up and allow gas to flow. You may need a long wire with a match twisted to the end to light it. They didn't place it in the best location.

Next Check your upper and lower limit switches these are the proper settings:
Upper = 7680-3791= Open @ 140*/Close @ 120*

Lower = 7660-3591 = Open @ 150*/Close @ 130*

Fan- Limit = 7700-3281 = Open @ 120*/Close @ 90*

Next check the burner & automatic relight burner assembly, make sure they are clean and functioning as designed.

If it still does not work feel free to contact me. George