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Heavy Repair Method of Refrigerator by Application of Refrigerant
Chapter 9 Heavy Repair Method of Refrigerator by Application of
Refrigerant
1. Outline
1-1. Checkpoints before Heavy Repair
Open the Cover ASM, Back-M/C of refrigerator and check the type of refrigerant indicated on a compressor before starting work.A
yellow label is adhered to the compressor for the refrigerator using R600a as refrigerant.
1-2. Features of R600a Refrigerant
Non-polar natural gas refrigerant (CH(CH3)3)
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Since R600a is same series as butane gas, there is danger of fire when discharged into air at appropriate concentration (extreme
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handling is required for heavy repair of cycle).
Explosion concentration: .8% ~ 8.4%/Vol.
Burning temperature: 494
1-3. Features of R600a Refrigerator
With refrigerant quantity of 60% or so for the refrigerator using R134a as refrigerant
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Large vacuum level at suction pressure (at low pressure side)
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COMP capacity of the refrigerator using R609a as refrigerant is large by 1.7 times than that of the refrigerator using R134a.
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Labels as in Figure are displayed at the compressor of a refrigerant for R600a and the back plate of refrigerator.
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1-4. Location and Environment for Heavy Repair
Check that drafting and air ventilation are well done at a working area and perform work after making drafting and air ventilation
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smooth (use refrigerant return bag indoors).
Check that there are fire appliances or heating source around the working area and then remove them before work.
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Since R600a refrigerant is very inflammable, they should not be discharged indoors.
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Be sure to follow heavy repair SVC procedures during work.
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1-5. Heave Repair Work Tool
R600a refrigerant
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Bombe
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Pinch Pliers
Refrigerant Discharge Hose
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Refrigerant Return Bag
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Vacuum Pump
Handy Welding Machine
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Charging Tube
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Leakage Tester
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Drier
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