Gree GMV MTAC VRF Series, Руководство по обслуживанию

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Gree GMV MTAC VRF for North America
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5 Common Maintenance
5.1 Vacuum Drying for the System
5.1.1 Selection Requirement for the Vaccum Pump
Do not use different vacuum pump for vaccum-pumping for different refrigerant system.
The final 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.
5.1.2 Operation Procedure and Notices for Vacuum Drying
(1) Operation procedure.
1) Before vacuum-pumping, please confirm that the cut-off valve for gas pipe and liquid
pipe is at off status.
2) Use charging conduct pipe to connect the governing value and vacuum heat pump to
the detection joint of gas valve and liquid valve.
3) 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.
4) If the required vaccum degree can’t 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,
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.
(2) 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.
1) Vacuum pump for the gas pipe and liquid valve at the same time.
2) When turn off the vacuum pump to stop vacuum-pumping, please turn off the valve at
first and then de-energize the vacuum pump.
3) Keep the vacuum pump for 2h and confirm that the pressure of vacuum meter hasn’t
been increased.