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Handling R600a Refrigerant During Major Repairs
Chapter 9: Handling R600a Refrigerant During Major Repairs
9-1. Outline
9-1-1. Checkpoints before Major 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.
9-1-2. Features of R600a Refrigerant
• Non-polar natural gas refrigerant (CH(CH3)3)
• Since R600a is same series as butane gas, there is danger of fire when discharged into air at appropriate concentration
(extreme handling is required for heavy repair of cycle).
Explosion concentration : .8% ~ 8.4%/Vol.
Burning temperature : 494℃
9-1-3. Features of R600a Refrigerator
• With refrigerant quantity of 60% or so for the refrigerator using R134a as refrigerant
• Large vacuum level at suction pressure (at low pressure side)
• COMP capacity of the refrigerator using R609a as refrigerant is large by 1.7 times than that of the refrigerator using
R134a.
• Labels as in Figure are displayed at the compressor of a refrigerant for R600a and the back plate of refrigerator.
[Warning sign according to ISO 3864]
9-1-4. Location and Environment for Major Repair
• Check that drafting and air ventilation are well done at a working area and perform work after making drafting and air
ventilation 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.
• Since R600a refrigerant is very inflammable, they should not be discharged indoors.
• Be sure to follow heavy repair SVC procedures during work.
9-1-5. Required Tools
• R600a refrigerant
• Bombe
• Pinch Pliers
• Refrigerant Discharge Hose
• Refrigerant Return Bag
• Vacuum Pump
• Handy Welding Machine
• Charging Tube
• Leakage Tester
• Drier
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