SERVICING PRECAUTIONS
Features of refrigerant (R600a)After the refrigerant (R600a) is completely discharged, repair any defective
" Achromatic and odor less gas.parts and replace the dryer. At any case you must use the LOKRING for
" Flammable gas and the ignition (explosion) at 494°C.connecting or replacing any part in the cycle (No Fire, No Welding).
" Upper/lower explosion limit: 1.8%~8.4%/Vol.Connect the Schrader valve to pump with the coupler. And then turn the
pump on for vacuum state (Figure 3). Let the pump run until the low-
Features of the R600a refrigerator
pressure gauge indicates the vacuum (gauge pressure 0, absolute
" Charging of 60% refrigerant compared with a R134a model
pressure -1atm or -760mmHg). Recommended vacuum time is 30 min.
" The suction pressure is below 1bar (abs) during the operation.
Charge the N2 gas in order to check for leakage from welding points and the
" Because of its low suction pressure, the external air may flow in the
LOKRING. If leakages are found, repair the defects and repeat the vacuum
cycle system when the refrigerant leak, and it causes malfunction in
process.
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).
TO THE
" The EVAPORATOR or any other cycle part that has welding joint is
VACUUM
hidden in the foam. (If not hidden inside, the whole electric parts must bePUMP
tested with the LEAKAGE TEST according to the IEC Standard.)PRESSURE
" The compressor has label of the refrigerant R600a.GAUGE
" Only the SVC man must have an access to the system.Figure 3
Installation place
After the system is completely vacuumed, fill it with the refrigerant R600a up
" Must be well ventilated.
to what has been specified at your refrigerator Name Plate. The amount of
3
" Must be 20 m or larger.
refrigerant (R600a) must be precisely measured within the error of ?2g by
" Must be no-smoking area.
an electron scale (Figure 4).
" No ignitable factors must be present.
If you use the manifold connected with both the refrigerant (R600a)
Utilities
cylinder and the vacuum pump simultaneously, make sure the
" Refrigerant cylinder (MAX NET 300g)
pump valve is closed (Figure 5).
" Manometer
" Vacuum pump (600l/min)REFRIGERANT
(R600a)
" Piercing Clamp
CHARGING HOSE
" Quick couplerCOUPLE
" Hoses (5m-1EA, 1m-3EA)
" LOKRING
" Portable Leakage detector (3g/year?)
" Nitrogen cylinder (for leakage test)
THROTTLE
" Concentration gaugeVALVE
Make sure before ServicingWEIGH SCALE
Figure 4
" Refrigerant
Confirm the refrigerant by checking Name Plate and the label on theFILLING OR VALVE TO BE OPENED
compressor, after opening the COVER ASSY, BACK-M/C.CHARGE TUBEWHEN REFILLING
" If the refrigerant is R600a, you must not weld or apply a heat source.
Air Recharging in CompressorTO THE TO THE CHARGE
REFRIGERATIONCYLINDER
Before refilling the refrigerant, you must perform the test according toSYSTEM
Chapter 5 (TROUBLESHOOTING CHART). When the defects are
found, you must discharge the residual refrigerant (R600a) in theVALVE TO BE CLOSED
AFTER VACUUM
outdoor. For discharging the refrigerant R600a, break the narrow
portion of tube extension by hand or with a pipe cutter as shown inFigure 5
TO THE VACUUM PUMP
Figure 1. Leave it for 30min in outside to stabilize the pressure with
ambient. Then, check the pressure by piercing the dryer part withConnect the charging hose (that is connected to the refrigerant (R600a)
piercing pliers. If the refrigerant is not completely discharged, let thecylinder) to the Schrader valve installed on the service tube. Then, charge
refrigerator alone for more 30min in outside.the refrigerant (R600a) by controlling the Throttle valve. When you do so,
do not fully open the Throttle valve because it may make damage to the
POINT TO BE
CHARGE TUBE compressor. Gradually charge the refrigerant (R600a) by changing openBROKEN
EXTENSION
and close the Throttle Valve (5g at each time). The charging hose must use
a one-way valve to prevent the refrigerant refluence. Close the Schrader
valve cap after the refrigerant (R600a) is completely recharged.
SCHRADER VALVEAfter you completely recharge the refrigerant (R600a), perform the leakage
(ONE-WAY VALVE)
SERVICE TUBE test by using a portable leakage detector or soapy water.
EXTENSIONLOKRING
Test the low pressure (suction) parts in compressor off time and high
pressure parts in compressor on time. If the leakages are found, restart fromFigure 1Figure 2
the refrigerant (R600a) discharging process and repairs defects of leaks.
Attach the service tube installed with a Schrader valve (one-way valve)
After the leakage test, check the temperature of each parts of the cycle.
by using the LOKRING (Figure 2). Then, connect the Schrader valve
Check with hands if the CONDENSER and the case (HOT-LINE pipe) that
(one-way valve) to the pump that is connected to the discharging hose
is contacted to the door gasket are warm. Confirm that frost is uniform
leading to the outside. When discharging the residual refrigerant, repeat
distributed on the surface of the EVAPORATOR.
3 cycle that includes 3min of the pump running->pump off->30sec of
the compressor running.
--2- |
ACEC
LG-GOLDSTAR
