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  1.  Condenser/Radiator 
  2.  Defrost Air Switch (DAS) 
  3.  Receiver And Sight Glasses 
  4.  Liquid Line Service Valve 
  5.  Compressor Suction Modulation Valve (CSMV) 
  6.  Filter Drier 
  7.  Liquid Injection Valve (LIV) 
  8.  Economizer Heat Exchanger 
  9.  Economizer Solenoid Valve (ESV) 
 10.  Compressor Discharge Pressure Transducer (CDP) 
 11.  Thermal Expansion Valve (Economizer) 
 12.  Unloader Solenoid Valve (USV) 
 13.  High Pressure Switch (HP1) 
 14.  Compressor Suction Temperature Sensor (CST) 
 15.  Discharge Service Valve 
 16.  Compressor Discharge Temperature Sensor (CDT) 
 17.  Compressor Suction Pressure Transducer (CSP) 
 18.  Suction Service Valve 
 19.  Compressor (C) 
 20.  Model/Serial Number Nameplate 
 21.  Economizer Connection 
 22.  Power Supply Receptacle (PSR) 
 23.  Condenser Fans And Motors (CDM1 & CDM2) 
 24.  Ambient Air Temperature Sensor (AAT) 
Figure 2-1. Vector 1550 Front View - Refrigeration System Components