MCAC-VTSM-2016-04 R410A DC Inverter VRF V4 Plus W Series 50Hz
Installation 189
your selection, final confirm the main pipe diameter is: gas/liquid pipeΦ38.1/Φ22.2.
D Parallel connect the main units
1) The main unit linked by Pipe g1 is 8HP, parallel connects with main unit. the connective pipe diameter to be
selected according to its connector size isΦ25.4/Φ12.7;The main unit linked by Pipe g2 is 8HP, parallel
connects with main unit. the connective pipe diameter to be selected according to its connector size
isΦ25.4/Φ12.7;The main unit linked by Pipe g3 is 10HP, parallel connects with main unit. the connective pipe
diameter to be selected according to its connector size isΦ25.4/Φ12.7.
2) The upstream of G1 is the two parallel connected main units, refer to Table 5-9 select the three parallel
connected main unit, the pipe diameter isΦ38.1/Φ19.1.
3) Parallel connect the three main units, refer to Table 5-7 should select FQZHW-03N1C for main unit
connective pipes (L+M).
4.8 Remove dirt or water in the piping
1. Make sure there is no any dirt or water before connecting the piping to the main units.
2. Wash the piping with high pressure nitrogen, never use refrigerant of the main unit.
4.9 Gas tight test
1) Upon set up the indoor unit pipeline, please connect the Hi-pressure pipe with shut-off valve firstly.
2) Weld the pipe at the low pressure side to the meter connector.
3) Use the vacuum pump discharging air inside the liquid side shut-off valve and meter connecter, until to the
-0.1MPa.
4) Close the vacuum pump, charge 3.9MPa nitrogen gas from the piston of shut-off valve and from the meter
connector. Pressure inside should be maintained at there no less than 24 hrs.
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