It was a gift and I have no instrutions

Wondering if you have the correct model number; could it be 85SUFF?

SUFF = Single Under Fryer Filter

The Specification Sheet may be here:

http://www.frymaster.com/docs/uploaded/fry/products/SpecSheets/Cascade%2

This however does not seem to correspond to available manuals listed here

Suggest you check the the manufactuer's information to verify the model number; should be a plate with the model and serial nunber etc..

Alternatively you could view some of the available manuals to see if one pertains to yours.