72
U-MATCH Air
Conditioners
Service Manual
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Pipe diameter 7LJKWHQLQJWRUTXH
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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Valve Cap
Inner Hexagon
Spanner
Screwdriver
Valve Stem
Figure 3-1-4
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