FO OF AN ACR LTT COMPLAINS THAT THE CAPT FLEW INTO KNOWN ICING CONDITIONS WITH A MELED GENERATOR RESTRICTING ANY OP INTO KNOWN ICING. THE FO ALSO WENT THROUGH THE EMER LAVATORY SMOKE DETECTOR CHKLIST AGAINST THE CAPT'S WISHES AFTER REPEATED SMOKE DETECTION WARNINGS.

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ON OCT/SAT/97; FLT XX ACFT ABC; A L AC GENERATOR WAS MELED INOP. A CONDITION OF THE MEL WAS NO FLT INTO ICING CONDITIONS. IT WAS THE CAPT'S LEG. WHEN IT WAS EVIDENT THAT WE WOULD BE FLYING INTO ICING; I (FO) SUGGESTED A LOWER ALT TWICE. I WAS OVERRULED BY THE CAPT; THEREBY FLYING AGAINST MEL PROC. DURING FLT WW TO AMA; ACFT DEF; WE GOT A LAVATORY SMOKE WARNING ON STEADY AND INTERMITTENTLY. I EXPRESSED MY CONCERN TO THE CAPT AND INITIATED THE EMER PROCS; WHICH HE OBJECTED TO; STATING IT WAS THE HUMIDITY CAUSING A FALSE WARNING. I HAD THE FLT ATTENDANT CHK THE LAVATORY; CHKED IT MYSELF; AND LATER IN THE FLT; THE CAPT CHKED IT. THE CAPT THEN TOLD ME TO RESET THE LAVATORY CIRCUIT BREAKERS (AGAINST OPS MANUAL PROCS). WHEN I OBJECTED HE DISPLAYED ANGER AND IRRITATION QUESTIONING HOW LONG I HAD BEEN AN AIRLINE PLT. I RESET THE CIRCUIT BREAKERS AND AGAIN THE WARNING SOUNDED. AGAIN I WENT THROUGH THE EMER PROCS AGAINST HIS WISHES. I AGAIN EXPRESSED MY CONCERN ABOUT THE LAVATORY WARNING; TELLING HIM I WAS EXTREMELY UNCOMFORTABLE FLYING WITH A LAVATORY SMOKE WARNING. I CITED THE OPS MANUAL WHICH STATES THAT YOU MUST TREAT ALL WARNINGS AS IF THEY ARE AN ACTUAL SIT. HE OVERRULED ME AND CONTINUED THE FLT. IT WAS THE SAME CAPT IN BOTH SITS (ACFT GENERATOR AND LAVATORY SMOKE WARNING).