Gree GKH12K3BI, Service Manual

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72
U-MATCH Air
Conditioners
Service Manual
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Pipe diameter
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1/4"
1ÂP
3/8"
1ÂP
5/8"
1ÂP
1/2"
1ÂP
3/4" 1-75
1ÂP
‹ Curvature of piping shall not be too small, or otherwise piping may be broken. So installation personnel
should use a pipe bender to bend pipes.
‹ Upward or longitudinal welding joint method is usually applied to the welding of pipelines. The welding
method that mouth of pipe is downward (face-down welding) should be avoided as far as possible,
because such method is prone to welding defects and even would cause leakage, as shown in Figure 3-1-
3.
Bumer
Solder
Downward facing
Side facing
Recommended methed
Upward facing
Figure 3-1-3
‹
Uninsulated connecting pipes and connectors should be packed with sponge and tied with plastic adhesive
tapes.
2. Vacuum-pumping and leak detection
‹
Dismantle the bonnet of refrigerant valve and air valve.
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‹
Tighten the nuts with a spanner.
‹ Remove the one way valve cap of air valve.
‹ Unscrew the spool of refrigerant valve for 1/4 turn with a socket head wrench, and at the same time push
up the spool of air valve with a screwdriver to let air give off.
‹ Air exhaust continues for 15 seconds until coolant gas appears, immediately shut off one way valve and
tighten the valve cap.
‹ Totally open the spool of refrigerant valve and air value (as shown in Figure 3-1-4)
One-Way Valve
Gas Valve
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alve
Valve Cap
Inner Hexagon
Spanner
Screwdriver
Valve Stem
Figure 3-1-4