Gree R410A, Manual

Page: 83 / 90

81
for North America
5 Vacuum drying for the system
5.1 Selection requirement for the vaccum pump
Do not use different vacuum pump for vaccum-pumping for different refrigerant system
；
The air discharge volume for the vacuum pump should reach 4L/S above;
The precision of vacuum pup should reach 0.02mmHg above;
The system vacuum pump for R410A must be with check valve.
5.2 Operation procedure and notices for Vacuum drying
1) Operation procedure
a
b .Use charging conduct pipe to connect the governing value and vacuum heat pump
to the detection joint of gas valve and liquid valve;
c .After vacuum-pumping for 4h, check whether the vacuum degree is reached to
-0.1MPa or above; If not, there may be gas leakage. Please perform the leakage
inspection again. If there’s no gas leakage, please vacuum pump for another 2h.
d
vacuum pump for 2h and then keep the vacuum for 1h. If -0.1 MPa vaccum degree
still can’t be reached, repeat this operation unitl the water is drained out completely.
e
.
After evacuation, close the regulating valve, and 1 hour later check if its pressure
goes up or not.
2)
a .Vacuum pump for the gas pipe and liquid valve at the same time;
Connector on gas side
Connector on liquid side
Gas
liquid
Pressure gauge connector valve
Refrigerant cylinder
Spring balance
b
c
The final vacuum for the vacuum pump should reach -0.1MPa.
.Before vacuum-pumping, please confirm that the cut-off valve for gas pipe and liquid
pipe is at off status;
.If the required vacuum degree cannot be satisfied after vacuum-pumping for two
times, there are water inside the pipeline. please drain out the water by the method of
vaccum damage. The detailed method: charge 0.05MPa nitrogen into the pipeline,
After the vacuum pump is finished, turn off the valve of governing valve and stop
vacuum pump and keep it for 1h. Please confirm that the pressure of governing valve
hasn’t been increased.
.When turn off the vacuum pump to stop vacuum-pumping, please turn off the valve at first and then
de-energize the vacuum pump;
.Keep the vacuum pump for 2h and confrm that the pressure of vacuum meter hasnot been increased;
5.3 Fill and charge refrigerant
5.3.1 Filling procedure of regrigerant
Refrigerant quantity of outdoor unit before delivery:
Model GMV-HY36WLT/A-T(U) GMV-HY48WLT/A-T(U)
Refrigerant Qty (kg/oz) 6.0(212) 6.0(212)
Photovoltaic Direct-driven VRF