Service Precautions For R600A Refrigerant - EdgeStar CWB8420DZ Service Manual

2.4 Service Precautions for R600A Refrigerant

Features of R600a refrigerant
Achromatic and odorless gas.
Flammable gas with ignition (explosion) at 494°C.
Upper/lower explosion limit: 1.8%~8.4%/Vol.
Features of the R600a refrigeration unit
Charging of around 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 will cause a 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).
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 label of the refrigerant R600a.
Only a qualified technician should access the system.
Installation place
Must be well ventilated.
Must be 20 cubic meters or larger.
Must be no-smoking area.
No ignitable factors may be present.
Tools needed
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
Make sure before servicing
Confirm Refrigerant by checking Name Plate and the label on the compressor.
With R600a you must not weld or apply a heat source until refrigerant has been vented.