EMPLOYEE WAS CLEANING & INSTALLING A/C UNIT FOR THE CONTROL ROOM. THE UNIT HAD TO BE LIFTED APPROX. 8'. HE STRAINED HIS LEFT ARM IN THE PROCESS & THE NEXT DAY A BURSITIS POCKET DEVELOPED ON HIS LEFT ELBOW. HE WENT TO THE DR. ON 4/24/06, AT WHICH TIME THEY DRAINED THE POCKET OF FLUID. MEDICAL ONLY.