GREE U-Match 6 SERIES UNIT SERVICE MANUAL
81
Step 2: After vacuum drying, close the high and low pressure gauge valves. Then remove the middle
gauge line from the connector of vacuum pump. Then connect to the refrigerant tank.
Step 3: Loosen the middle gauge line from the connector of pressure gauge to a proper extent and
slightly open the valve of refrigerant tank. Evacuate the middle gauge line. Then tighten up the connector
again and completely open the valve of refrigerant tank at the same time.
Step 4: Keep the refrigerant tank erect and put it on an electronic scale. Record the current weight as
m1.
Step 5: Open the high pressure gauge valve (Keep the low pressure gauge valve closed). Then
charge refrigerant into the system. Meanwhile, record the weight of refrigerant tank as m2.
Step 6: m1-m2=m. If m equals to the required charging quantity M, close the valve of refrigerant tank
at once. Then move to step 8.
Step 7: If you can’t continue to charge refrigerant into the system and the quantity of charged
refrigerant is less than the required charging quantity, then record the current quantity of charged
refrigerant:
m=m1-m2
m`=M-m
The remaining charging quantity is: m`=M-m
Step 8: After charging, remove the pressure gauge.
Refrigerant charging when unit is turned on:
Step 1: Close the valve of refrigerant tank. First remove the pressure gauge lines and connect the
outdoor unit to the indoor unit. Then reconnect the pressure gauge lines. Connect the low pressure gauge
line to the other joint of gas valve and connect the high pressure gauge line to the liquid valve. Connect
To Next Page
Loading...