Norsup 7026965 Manuel D'installation Et D'instructions page 37

6.APPENDIX
AT: Ambient temperature
COMP: Compressor
CT: Coil temperature
EEV: Electronic expansion valve
EP: Exhaust protection
ET: Exhaust temperature
FM: Fan motor
FS: Flow switch
HP: High pressure protection
IT: Inlet water temperature
LP: Low pressure protection
OT: Outlet water temperature
SPS: Switching power supply
4V: 4way valve