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Because the unit is charged with refrigerant R-410A, the below issues should be paid attention:
• To prevent the different oil going into the pipe, please use the special tool for R-410A, especially for gauge
manifold and charging hose.
• To prevent the compressor oil going into the refrigerant cycle, please use the anti-backow adapter.
• When maintaining the outdoor, release refrigerant from check valve. Set the relative DIP switch when vacuuming
and the details refer to Page 74.
D. Check valve operation
Open/close method:(The gas pipe check valve for YV2WYH035KAS-D-X)
• Remove the valve cap, gas pipe valve turns to "open" state as right gure.
• Turn the liquid pipe valve and the oil equalization pipe valve with
hexangular spanner until the shaft stops. If opening the valve strongly, the
valve will be damaged.
• Tighten the valve cap.
Tighten torque as the table below:
Note: The gas pipe check valve for YV2WYH024KAS-D-X, YV2WYH029KAS-D-X is screw type. Rotate the rod
clockwise totally, the valve is close; rotate the rod counterclockwise totally, the valve is open; if the rod is not totally
rotated clockwise or counterclockwise, the check valves of indoor, outdoor and the check valve will be connected.
E. Additional refrigerant charging
Charge the additional refrigerant as liquid state with the gauge.
If the additional refrigerant cannot be charged totally when the outdoor stops, charge it at the trial mode.
If the unit runs for a long period in the state of lack of refrigerant, compressor will occur failure.
( the charging must be nished within 30 minutes especially when the unit is running, meanwhile charging the
refrigerant).
The unit is charged only part of the refrigerant at the factory, also need additional refrigerant at the installation site.
W1: Refrigerant charging volume to outdoor unit at factory.
W2: Refrigerant charging volume to outdoor unit on site.
W3: Refrigerant charging volume to liquid pipe based on different piping length calculation.
W3 = actual length of liquid pipe × additional amount per meter liquid pipe
= L1 × 0.35 + L2 × 0.25 + L3 × 0.17 + L4 × 0.11 + L5 × 0.054 + L6 × 0.022
Tighten torque N·m
Shaft (valve body) Cap (cover) T-shape nut (check joint)
For gas pipe Less than 7 Less than 30 13
For liquid pipe 7.85 (MAX15.7) 29.4 (MAX39.2) 8.8 (MAX14.7)
For oil equalization pipe 4.9 (MAX11.8) 16.2 (MAX24.5) 8.8 (MAX14.7)
"open" state
"close" state
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