32
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.
• When maintaining the outdoor, release refrigerant from check valve. Set the relative DIP
switch when vacuuming and the details refer to Page 44.
D. Check valve operation
Open/close method:
• Remove the valve cap, gas pipe valve turns to "open" state as
right figure.
• 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.
• 10HP, 12HP models, please refer the specification to choose
gas pipe, in stop valve of gas pipe need connect the pipe
adaptor.
Tighten torque as the table below:
Note:
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 finished 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
Installation procedure
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)
"close" state
O
S
"open" state
S
O
