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Home›Repair guides›Air Conditioning System Refrigerant Charging and Testing

CASE — Air Conditioning System Refrigerant Charging and Testing

A CASE service procedure — check it applies to your exact model before use.

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Before you start

  • DO NOT USE ANY OTHER TYPE OF REFRIGERANT OR IT WILL VOID THE WARRANTY

Procedure

  1. Pressure test the system using nitrogen to a pressure of 250 psi. Check for leaks.
  2. Add 2oz of SP20 Sanden PAG oil to the system.
  3. Vacuum the system for at least 1/2 hour.
  4. Check that the vacuum holds.
  5. Fill the system with 2.75 to 3 lbs of R134a refrigerant. DO NOT USE ANY OTHER TYPE OF REFRIGERANT OR IT WILL VOID THE WARRANTY.
  6. Test the system. Check the cycling temperature of the thermostat. Adjust the thermostat settings if required to avoid coil freeze up problems.

Tools required

  • Pressure test equipment (nitrogen)
  • Vacuum pump (at least 1/2 hour capacity)

Specs & torque values

  • 2oz SP20 Sanden PAG oil
  • 2.75-3 lbs R134a refrigerant
  • 250 psi nitrogen test pressure

Source: manual:INST-K 570 MXT CASE.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.