Check Valve Operation; Additional Refrigerant Charging - Haier AV08NMSETA Service Manual

Because the unit is with refrigerant R410A, the below issues should be paid attention:
■
To prevent the different oil into the pipe, please use the special tool for R410A, especially for gauge manifold
and charging hose.
■
To prevent the compressor oil into the refrigerant cycle, please use the anti-counter-flow adapter.
D. Check valve operation
Open/close method:
■
Take down the valve cap, gas pipe turns to "open" state as right figure.
■
Turn the liquid pipe with hexangular spanner until it stops. If opening
the valve strongly, the valve will be damaged.
■
Tighten the valve cap.
Tighten torque as the table below:
For gas pipe
For liquid pipe
E. Additional refrigerant charging
Charge the additional refrigerant as liquid state with the gauge.
If the additional refrigerant can not 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 base 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
L1: Total length of 22.22 liquid pipe;
L2: Total length of 19.05 liquid pipe;
L3: Total length of 15.88 liquid pipe;
L4: Total length of 12.7 liquid pipe;
L5: Total length of 9.52 liquid pipe;
L6: Total length of 6.35 liquid pipe;
Total refrigerant volume charging on site during installation=W2+W3
W: Total refrigerant volume charging on site for maintenance.
Tighten torque N·m
Shaft (valve body)
8~9
5~6
36 36
Open
S
0
Close
S
Cap (cover) T-shape nut (check joint)
22~27
13~16
0
8~10
8~10