What was found
SMOKE AND UNCOMMANDED HEAT IN COCKPIT SHORTLY AFTER TAKEOFF. THE FREON AIR CONDITIONING SYS HAD BEEN DEFERRED DUE TO A DAMAGED DRIVE BELT REQUIRING REPLACEMENT. THE (M) PROCEDURE 21-50.1 CALLED FOR THE "AIR COND" CIRCUIT BREAKER TO BE PULLED/COLLARED. WITH THIS CIRCUIT BREAKER PULLED AIR CONDITIONING SYS GOES TO MANUAL MODE, NOT AUTOMATIC MODE THEREFORE THE CABIN VALVE GOES FULL HOT RESULTING IN EXTREME HEAT IN DUCTING WHICH ALSO CAUSED LIGHT SMOKE (PROBABLY FROM DEBRIS). RESET AIR/COND CIRCUIT BREAKER, SYS OPS CHECKED GOOD. PULLED CIRCUIT BREAKER 410 FOR FREON AIR SYS VERIFIED FREON AIR SYS INOP. FOUND (M) PROCEDURE FOR DMI 21-50. 1 IDENTIFIES THE WRONG C/B FOR DEACTIVATION. THE FREON AIR CONDITIONING SYS WAS REPAIRED, THE DEFERRAL CLEARED. THE AIR CONDITIONING SYS WAS VERIFIED TO BE OPS. MEL PROCEDURE 21-50-1 IS TO BE REWRITTEN.