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(Example 3)
Toward indoor unit
Toward indoor unit
The amount of Refrigerant
The calculation of the additional charge should take into account the
length of pipe and CF(correction Factor) value of indoor unit.
2 m
Toward indoor unit
=
Additional charge(kg)
Total liquid pipe : Ø25.4 mm
+
Total liquid pipe : Ø22.2 mm
+
Total liquid pipe : Ø19.05 mm
2 m
Toward indoor unit
+
Total liquid pipe : Ø15.88 mm
2 m
+
Total liquid pipe : Ø12.7 mm
+
Total liquid pipe : Ø9.52 mm
+
Total liquid pipe : Ø6.35 mm
CF value of indoor unit
Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5 kW -1ea, Ceiling concealed
Duct 7.3 kW-2ea, Wall Mounted 2.3 kW-4ea
CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12 kg
Attach the additional refrigerant table of IDU.
!
CAUTION
Do not use 0 or 1 series of indoor unit.
ex)ARNU****0(X) , ARNU****1(X)
h
Oil Trap
h
Toward indoor unit
x 0.480(kg/m)
x 0.354(kg/m)
Oil Trap
x 0.266(kg/m)
x 0.173(kg/m)
x 0.118(kg/m)
x 0.061(kg/m)
x 0.022(kg/m)
!
WARNING
• Regulation for refrigerant leakage :
The amount of refrigerant leakage should satisfy the following
equation for human safety.
Total amount of refrigerant in the system
Volume of the room at which Indoor Unit of
h
the least capacity is installed
If the above equation can not be satisfied, then follow the follow-
ing steps.
• Selection of air conditioning system: select one of the next
- Installation of effective opening part
- Reconfirmation of Outdoor Unit capacity and piping length
- Reduction of the amount of refrigerant
- Installation of 2 or more security device (alarm for gas leakage)
• Change Indoor Unit type :
Installation position should be over 2 m from the floor
(Wall mounted type → Cassette type)
• Adoption of ventilation system :
Choose ordinary ventilation system or building ventilation system
• Limitation in piping work :
Prepare for earthquake and thermal stress
Refrigerant charging
Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
Liquid pipe
Gas pipe
!
WARNING
• Pipe to be vacuumed : gas pipe, liquid pipe
• If the refrigerant amount is not exact, it may not operate prop-
erly.
• If additionally bottled refrigerant amount is over 10%, condenser
burst or insufficient indoor unit performance may be caused.
17
≤0.44 (kg / m
3
)
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