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8.8 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 nished within 30 minutes especially when the unit is running, meanwhile charging the refrigerant).
A. Charging amount when out 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
Additional refrigerant charging per meter (kg/m)
Charge when out of factory
Model φ22.22 φ19.05 φ15.88 φ12.7 φ9.52 φ6.35
AU282FHERA
0.35 0.25 0.17 0.11 0.054 0.022
2.6kg
AU482FIERA (G) 3.6kg
AU48/60NFIERA (G) 4.0kg
Refrigerant charging amount when out of factory excludes that in the distributing pipe.
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 color 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.
Fix the refrigerant pipe
■ In operation, the pipe will vibrate and expand or shrink. If not being xed, the refrigerant will focus on one part to
cause the broken pipe.
■ To prevent the central stress, x the pipe for every 2-3m.
Heat insulation
■ Gas pipe and liquid pipe should be heat insulated separately. The material
for gas pipe should endure the high temperature over 120 °C.That for liquid
pipe should be over 70 °C.
■ The material thickness should be over 15mm, when ambient temp. is 30 °C,
and the relative humidity is over 80%, the material thickness should be over
20mm.
■ The material should cling the pipe closely without gap, then be wrapped
with adhesive tape. The connection wire can not be put together with the
heat insulation material and should be far at least 20cm.
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