Haier MRV SII AU042FNEUA Service Manual page 37

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.
(8) Check vale operation
Open/close method:
■ Take down the valve cap.
■ Turn the liquid stop valve and the gas stop valve 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
(9) 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, menawhile charging the
refrigerant).
A. Charging amount when out of factory excludes the refrigerant in the pipe.
B. The unit only is charged the standard volume of refrigerant (distributing pipe length is 0m). Additional charging
amount=actual length of liquid pipe x additional amount per meter liquid pipe
Additional charging amount=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;
C. Refrigerant charging and additional charging
Additonal refrigerant charging per meter(kg/m)
Ø22.22 Ø19.05
0.35 0.25
Note:
■ To prevent the different oil into the pipe, please use the special tool for R410A, especially for gauge manifold and
charging hose.
■ Mark the refrigerant type in different colour on the tank. R410A is pink.
■ Must not use the charging cylinder, because the R410A will change when transferring to the cylinder.
■ When charging refrigerant, the refrigerant should be taken out from the tank as liquid state.
■ Mark the counted refrigerant volume due to the distributing pipe length on the label.
GWP: 2088
The product contains fluorinated greenhouse gases and its functioning relies upon such gases.
Tighten torque N.m
Shaft (valve body) Cap (cover)
Less than 7 Less than 30
7.85 (MAX15.7) 29.4 (MAX39.2)
Ø15.88 Ø12.7
0.17 0.11
T-shape nut (check joint)
13
8.8 (MAX14.7)
Ø9.52 Ø6.35
0.054 0.022
35
Charge when out of
factory
Refer to label