that is connected to the discharging hose leading to the outside. When discharging the residual
refrigerant, repeat 3 cycles that includes 3min of the pump running->pump off->30sec of the
compressor running.
After the refrigerant (R600a) is completely discharged, repair any defective parts and replace the
filter dryer. Connect the Schrader valve to pump with the coupler. And then turn the pump on for
vacuum state. 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. 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 unit Rating Label. The amount of refrigerant (R600a) must be precisely
measured within the error of ±2g by an electron scale.
If you use the manifold connected with both the refrigerant (R600a) cylinder and the vacuum
pump simultaneously, make sure the pump valve is closed.
Connect the charging hose (that is
connected to the refrigerant (R600a)
cylinder) to the Schrader valve installed on
the service tube. Then, charge 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 compressor.
Gradually charge the refrigerant (R600a)
by changing open 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.
After you completely recharge the
refrigerant (R600a), perform the leakage
test by using a portable leakage detector
or soapy water. Test the low pressure (suction) parts in compressor off time and high pressure
parts in compressor on time. If the leakages are found, restart from the refrigerant (R600a)
discharging process and repairs defects of leaks.
After the leakage test, check the temperature of each parts of the cycle. Check with hands if the
CONDENSER and the case (Hot Pipe) that is contacted to the door gasket are warm. Confirm
that frost is uniform distributed on the surface of the EVAPORATOR.
