Evaporator Freezing Up - Uneven Ice Buildup

Check refrigerant level. Is refrigerant level low?

    YES:

  1. If sight glass is low on TXV system, always perform visual check and add refrigerant to full site glass plus 10% of system charge.
  2. Perform in depth leak test. On cap tube systems a frost pattern will show up at the end of the cap tube if low on refrigerant or possible restriction. Always leak check first.
  3. Add in correct refrigerant to factory recommended amount. If pressures show extreme low suction with low to normal head pressure, restriction condition is 95% likely. Restrictions in cap tube systems are normally caused by overheating the compressor oil, due to high condensing temperatures from lack of maintenance.
  4. Head master proper operation will bypass condenser sending hot gas mixed with liquid to evaporator. If system is low on refrigerant, sight glass will show low and head master will send only hot gas through the liquid line.
  5. *Quick test: Block off condenser and watch head pressure rise. Head master will stop bypassing hot gas to liquid line.