A recommendation to include hundreds of librarians and other school employes who are not classroom instructors in an evaluation program that is part of Fairfax County's multimillion-dollar teacher merit pay plan will come before the School Board this week.

Superintendent Robert R. Spillane wants to try an on-the-job evaluation system next year for reading teachers, librarians, counselors, resource teachers and special-education employes in 16 schools. Eventually, the evaluation system would be the basis for merit pay, but would involve no money next year.

Those employes already are scheduled to receive the 30 percent raises over three years that teachers will receive in return for submitting to more rigorous performance evaluations. Under the Washington area's first merit pay plan for teachers, all raises beginning in the 1989-90 school year will be based on those evaluations.

Details about the proposal, which the board will vote on July 9, have not yet filtered down to the school employes who would be affected by it. But two school librarians voiced mixed feelings yesterday that are similar to the sentiments of teachers already in the program.

One elementary school librarian, who did not wish to be identified, said she had some reservations about the human factors involved in implementing a supposedly objective evaluation program, but said "basically it's a good idea. We should pay those who do a better job a little bit more than those who sit and collect their pay."

But an intermediate school librarian, who also did not wish her name used, said she was not interested in participating. After 16 years with the school system, "I'm not as concerned about salary as some of the younger people might be" and applying for the bonus is too much trouble, she said.

The inclusion of the guidance counselors, librarians and other school employes in that plan is controversial, with some saying merit pay is designed primarily to reward classroom teaching.

School Board Vice Chairwoman Joy K. Korologos said yesterday she believes the other employes should be on a separate pay scale from "teachers who spend most of their time in the classroom." Korologos, appointed to the board by County Board Chairman John F. Herrity, who shares her view, said she doubts she has the votes to win.

Korologos said approval of the pilot program would start the county down the road toward including those other employes in the merit pay plan, but board member Carla Yock disagreed. "I don't think it's committing us to anything but the pilot," she said.

The merit pay plan for teachers won the endorsement of the major teachers union, the Fairfax Education Association. Executive Director Rick Willis said the union, which insisted on including the guidance counselors, librarians and others, had a voice in drafting the proposal and generally approves of it.

The proposed program for the librarians and others would evaluate not only their classroom or one-on-one work with children, but also the management, administrative or other nonclassroom skills involved in their job, said Doris Torrice, a deputy school superintendent.

The schools involved would be Cameron, Cardinal Forest, Little Run, Spring Hill, Brookfield, Groveton, Forest Edge and Timber Lane elementary; Lanier, Poe, Franklin and Key intermediate; Edison, Langley, and Stuart high; and Lake Braddock Secondary.