Carrier 42HWG009 Technical Data & Service Manual page 31

2) 42HQG007/009/012 & HWG195/225/305H-SERIES INDOOR UNIT
LEGEND
K: RELAY
TB: TERMINAL BLOCK
TP: THERMAL PROTECTOR
CN: CONNECTOR
EC1: FAN MOTOR CAPACITOR
IDC Th: INDOOR COIL THERMISTOR
STM: STEP MOTOR
IDFM: INDOOR FAN MOTOR
FCU: FAN COIL UNIT
CDU: CONDENSING UNIT
RA Th: ROOM AIR THERMISTOR
MOV: METAL OXIDE VARISTOR
ODC Th: OUTDOOR COIL THERMISTOR
CB: TIME DELAY FUSE or CIRCUIT BREAKER
30
MSW: MAIN SWITCH
HS: HALL (RPM) SENSOR
ODFM: OUTDOOR FAN MOTOR
COMP: COMPRESSOR
TRANS: TRANSFORMER
RVS: REVERSING VALVE COIL