GMV DC Inverter VRF
40
Fig. 3.7.2
Step 5: Open the high pressure gauge valve (the low pressure gauge valve remains closed),
charge the system with refrigerant, and record the weight change of the refrigerant tank.
Step 6: When refrigerant tank is over and the refrigerant can't be charged to the system any more,
record the current weight of m2.
Step 7: Close the high pressure gauge valve and replace the refrigerant tank.
Step 8: Re-execute "step 3".
Step 9: Repeat "step 5" and "step 6" to record the weight of m3 before charging refrigerant and
the weight of m4 after charging refrigerant.
Step 10: If the refrigerant cannot be continuously charged into the system and the calculated
added amount of refrigerant has not been fully charged into the system, record current total
pre-charging amount:
m=(m1-m2) +(m3-m4) +…+(mn-1-mn)
Remained refrigerant for start-up charging m`=M-m
“M” is the calculated total required refrigerant-charging volume.
If the amount of pre-charging refrigerant “m” has reached the total added amount of refrigerant
for the system, close the refrigerant tank valve immediately to complete the refrigerant-charging work.
Skip to the "step 11".
Step 11: Complete the refrigerant-charging work and remove the pressure gauge, etc.
(2) Start-up charging of refrigerant.
Step 1: Close the refrigerant tank valve and reconnect the pipe of pressure gauge. Remove the
pipe of low pressure gauge from the check port of gas pipe valve and connect it to the low pressure
check valve (as shown in the Fig.).
