Daewoo Q600 series, Service Manual

Page: 72 / 112

7-10-6. Notes on CYCLE(R-600a) Repair
Others
Nitrogen-BLOWING Welding
1) When repairing pipes or injecting refrigerant, be sure to
replace dryer with one for R-600a.
Dryer replace
Residual Refrigerant Removal
1) The Refrigerator use R-600a for its Refrigerant, so use
exclusive parts and tools for it
Tool Use
Notes Item
1) When removing Residual Refrigerant, be sure to wait 5min.
or longer after the refrigerator power is off before the removal.
2) In the removal, cut the high-pressure side first and the
low-pressure side next
3) In case of a dry blockage, cut the capillary pipe to remove
the Refrigerant.
1) While welding, blow nitrogen with a constant pressure in
the pipe to prevent oxidation scale occurring
(Nitrogen pressure: 0.1~0.2 kgf/cm
2
)
1) Use nitrogen gas in cleaning the inside of the cycle piping.
2) Conduct a leakage test using an electronic leakage detector.
3) When cutting the pipe, be sure to use a pipe cutter.
4) Be careful not to allow any moisture inside the cycle.
5) When the Refrigerant is leaked, never use welding machine
nor a flame source.
6) Personnel other than those who took indoctrination shall
never be allowed to perform R-600a mid-repair.
8) Conduct leakage test thoroughly after a repair.
9) Never do a welding nor allow a fire source in
after Refrigerant is sealed in.
1) Check if the air circulation and ventilation of the place are
good.
2) Be sure to use a Refrigerant recollection bag indoors.
3) If there is a flame or a heat source around the place, remove
them.
4) Be sure to avoid discharging Refrigerant as it is very flammable.
5) Be sure to follow the mid-repair SVC procedure in the work.
Place and Environment of
CYCLE Repair
1) R-600a Refrigerant is a nonpolar natural gas Refrigerant
(C4H10).
2) R-600a Refrigerant is the same series as Butane with a risk of
explosion when it is discharged to a certain concentration.
3) It requires great care in CYCLE mid-repair.
Refrigerant R-600a
Characteristics
71