There is disappointment in store for some of the 106,000 U.S. supervisors and managers who had counted on getting merit pay raises worth several hundred dollars in their pre-Christmas paychecks.

Several agencies have notified Grade 13 to 15 employes, about half of whom live here, that the pay-for-performance increases of 2 to 4 percent will be delayed because they are awaiting more data from the Office of Personnel Management.

Congress changed the merit pay system just before it adjourned, at about the time agencies were calculating the raises, which are usually effective in October.

OPM told agencies to make the changes retroactive and crank them into their payroll systems as soon as possible. Most of the merit pay employes also will get the regular 3 1/2 percent civil service raise that begins in January.

However, some agencies say they can't figure out the new rules or make the payments by early December, the deadline OPM had recommended.

Some departments have still not given employes the 0.5 percent pay raise the government approved earlier this year. That increase -- designed to bring the 1984 pay increase to 4 percent -- is retroactive to the first of the year. Most employes have been given the extra half percent, but workers in a number of agencies still have not received the retroactive portion of that raise.