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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 OTHER REFRIGERANT TYPES

Procedure

  1. Pressure test the system using nitrogen to 250 psi. Check for leaks.
  2. Add 2oz SP20 Sanden PAG oil.
  3. Vacuum the system for at least 1/2 hour.
  4. Check that vacuum holds.
  5. Fill with 2.75-3 lbs R134a refrigerant.
  6. Test system and check thermostat cycling.

Tools required

  • Pressure test equipment (nitrogen)
  • Vacuum pump

Specs & torque values

  • 2oz SP20 Sanden PAG oil
  • 2.75-3 lbs R134a refrigerant

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.