0 113 MAINTENACE
GMV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
1) Operation procedure
a. Before vacuum-pumping, please confirm 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.
pump for another 2h.
d. er 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
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）Notices:
a. Vacuum pump for the gas pipe and liquid valve at the same time
b. When turn off the vacuum pump to stop vacuum-pumping, please turn off the valve at first and then
de-energize the vacuum pump
c. .Keep the vacuum pumping ased.
5.3 Airtightness test
5.3.1 Importance of airtightness test
The airtightness of VRF system is the leak tightness of the pipeline for refrigerant, which the guarantee for
safe and reliable operation.The leakage of refrigerant may affect the operation of air conditioner seriously, or even
damage compressor and then lead to breakdown of system. Therefore, it needs to perform the airtightness test. If
indoor ceiling decoration are all
be
finished before finishing indoor decoration.
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