Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 75 / 240

Ultra Heat GMV VRF Technical Service Manual INSTALLATION
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Step 5: Turn on the valve of the high pressure gauge (while keep the valve of the high pressure
gauge turned off) and then perfuse refrigerant to the system. Record the change of weight of the
refrigerant tank.
Step 6: When all refrigerant in the refrigerant tank is perfused, record the current weight m2.
Step 7: Turn off the valve of the high pressure gauge and replace the refrigerant tank.
Step 8: Perform step 3 again.
Step 9: Perform step 5 and step 6 again. Record the weight before perfusion m3 and weight after
perfusion m4.
Step 10:If there is no sufficient refrigerant and the calculated quantity of refrigerant is not fulfilled for
the system, record the current total perfusion quantity.
m=(m1-m2)+(m3-
m4)+…+(mn-1-mn)
Quantity of refrigerant to be perfused during running m=M-m
M is the required total quantity
If the pre-perfusion quantity (m) reaches the required total quantity for the system, turn off the valve
of the refrigerant tank immediately to finish perfusing and proceed with step 11.
Step 11: Remove the pressure gauge.
2.2 Refrigerant Perfusion During Running
Step 1: Turn off the valve of the refrigerant tank and reconnect the pressure gauge pipe. Disconnect
the low pressure gauge pipe from the detection valve opening of the gas pipe and connect it to the low
pressure check valve, as shown in the following figure.