21
SERVICE PRECAUTIONS
Air Recharging in Compressor
Attach the service tube installed with a Schrader valve (one-way valve) by using
the Lokring (Figure 2). Then, connect the Schrander valve (one-way valve) to the
pump that is connected to the discharging hose leading to the outside. When
discharging the residual refrigerant, repeat 3 cycle that includes 3min of pump
running->pump off->30sec of the compressor running.
After the refrigerant (R600a) is completely discharged, repair any defective parts
and replace the dryer. At any case you must use the LOKRING for connecting or
replacing any part in the cycle (No Fire, No Welding). 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-pressure gauge indicates the vacuum (gauge
pressure 0, absolute pressure -1atm or -760mmHg). Recommended vacuum time
is 30 min. Charge the N2 gas in order to check for leakage from welding points
and the LOKRING. If leakages are found, repair the defects and repeat the
vacuum process.
After the system is completely vacuumed, fill it with the refrigerant R600a up to
what has been specified at your refrigerator Name Plate. The amount of refrigerant
(R600a) must be precisely measured within the error of ±2g by an electron scale
(Figure 4).
If you use the manifold connected with both the refrigerant (R600a) cylinder and
the vacuum pump simultaneously, make sure the pump valve is closed (Figure 5).
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