Gree MULTI VRF SYSTEM II GMV-120WL/A-T User Manual

78
DC Inverter Multi VRF System II
Service Manual
2. Disconnect
inlet pipe and
outlet pipe
of plate heat
exchanger
● Weld those 4 connection spots on
the plate heat exchanger, and then
pull out the connection pipe.
Note: During welding process, do not
let ame burn out other parts
3. Replace plate
heat exchanger
● Replace plate heat exchanger
4. Replace gas
liquid separator
● Weld the pipe connected with plate
heat exchanger
Note: During welding process, do not
let ame burn out other parts
6 Common Maintenance
6.1 Vacuum drying for the system
6.1.1 Selection requirement for the vaccum pump
Do not use different vacuum pump for vaccum-pumping for different refrigerant system
；
The nal vacuum for the vacuum pump should reach -0.1Mpa;
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.
6.1. 2 Operation procedure and notices for Vacuum drying
1) Operation procedure
a .Before vacuum-pumping, please conrm that the cut-off valve for gas pipe and liquid pipe is at off status;
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 .If the required vaccum degree can’t be satised 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, vacuum
pump for 2h and then keep the cacuum 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) After the vacuum pump is nished, turn off the valve of governing valve and stop vacuum pump and keep it for 1h. Please conrm

Gree MULTI VRF SYSTEM II GMV-120WL/A-T Specifications

General

Brand	Gree
Model	MULTI VRF SYSTEM II GMV-120WL/A-T
Category	Inverter
Language	English