GREE ELECTRIC GUHD09NK3CO Service Manual page 94

U-Match Series DC
Inverter Service Manual
Use sponge to wrap the connection pipes and connectors that are not thermally insulated, and tighten with plastic
tapes.
b. Vacuum and Leakage Detection
Remove the cap from liquid valve and gas valve.
Align with the pipe center and tighten the jointing nuts adequately with your hand.
Tighten the nuts with wrench.
Remove the 1-way cap from the gas valve.
Use the hexagonal socket spanner to rotate the element of liquid valve for 1/4 turns and use the screwdriver to
prop up the element of gas valve to discharge the gas.
Discharge the gas for 15 seconds, until refrigerant gas appears. The, immediately close the 1-way valve and tighten
the valve cap.
Open the element of liquid valve and gas valve to full (See Fig. 3-1-4).
Tighten the valve cap and then use soap water or leakage detector to check the connection between outdoor unit
and pipe for any leakage.
Caution:
If possible, it is best to discharge the air out of the machine from the valve by using vacuum pump. To establish
vacuum by using vacuum pump, please operate as follows:
Take out the nut cover of the inlet for refrigerant.
Connect the tube of the vacuum watch with the vacuum pump, having the low-pressure end linking to the inlet for
refrigerant. (As shown in Figure 3-1-5)
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Figure 3-1-3
Figure 3-1-4
Figure 3-1-5