3. Cooling Cycle Heavy Repair
3-1. Features of refrigerant(R600a)
• Achromatic and odor less gas.
• Flammable gas and the ignition (explosion) at 494°C.
• Upper/lower explosion limit: 1.8%~8.4%Vol.
3-2. Features of the R600a refrigerator
• Charging of 60% refrigerant compared with a R134a model.
• The suction pressure is below 1bar (abs) during the operation.
• Because of its low suction pressure, the external air may flow in the cycle system when the refrigerant leaks and it causes
malfunction in the compressor.
• The displacement of compressor using R600a must be at least 1.7 times larger than that of R134a.
• Any type of dryer is applicable (XH-5, 7, 9), but recommend the X7-9.
• The EVAPORATOR or any other cycle part that has welding joint is hidden in the foam. (If not hidden inside, the whole
electric parts must be tested with the LEAKAGE TEST according to the IEC Standard.)
• The compressor has a label of the refrigerant R600a.
• Only the SVC man must have an access to the system.
3-3. Installation place
• Must be well ventilated.
• Must be 20m
3
or larger.
• Must be no-smoking area.
• No ignitable factors must be present.
3-4. Utilities
• Refrigerant cylinder (MAX NET 300g)
• Manometer
• Vacuum pump (600L/min)
• Piercing Clamp
• Quick coupler
• Hoses (5m-1EA, 1m-3EA)
• LOKRING
• Portable Leakage detector (3g/year ↓)
• Nitrogen cylinder (for leakage test)
• Concentration gauge
3-5. Make sure before Servicing
• Refrigerant
Confirm the refrigerant by checking Name Plate and the label on the compressor, after opening the COVER ASSEMBLY
BACK - M/C.
• If the refrigerant is R600a, you must not weld or apply a heat source.
TROUBLE DIAGNOSIS
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