INVENTOR u-match on/off, Service Manual

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U-MATCH AIR CONDITIONERS INSTALLATION
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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.
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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.
Figure 3-1-3
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Uninsulated connecting pipes and connectors should be packed with sponge and tied with
plastic adhesive tapes.
2
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Vacuum-pumping and leak detection
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Dismantle the bonnet of refrigerant valve and air valve.
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Align with the center of piping and adequately tighten nuts of connecting pipes by hand
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Tighten the nuts with a spanner.
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Remove the one way valve cap of air valve.
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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.
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Air exhaust continues for 15 seconds until coolant gas appears, immediately shut off one way
valve and tighten the valve cap.
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Totally open the spool of refrigerant valve and air value (as shown in Figure 3-1-4)
Figure 3-1-4