Replace smoke detector for supply side on unit 1, located in exam room 3. Upon arrival we removed old smoke detector, found sensing tube was different so we went to supply house and picked up correct one. Once we mounted new smoke detector we found that this one is a 4 wire and original one was a 2 wire. Building management technician named Joe from Della Donne associates was on site and is speaking to Fireline controls about this issue as well. He then informed me that he will be having them on site to follow up on wiring and calibrating new sensor with control panel in mchanical room.