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15
ENGLISH
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.
Total liquid pipe : Ø25.4 mm (1.0 inch)
Additional charge(kg)
Total liquid pipe : Ø22.2 mm (7/8 inch)
Total liquid pipe : Ø19.05 mm (3/4 inch)
Total liquid pipe : Ø15.88 mm (5/8 inch)
Total liquid pipe : Ø12.7 mm (1/2 inch)
Total liquid pipe : Ø9.52 mm (3/8 inch)
Total liquid pipe : Ø6.35 mm (1/4 inch)
CF value of Outside unit
CF value of indoor unit
=
+
+
+
+
+
+
+
x 0.480kg/m(0.323(lbs/ft))
x 0.354kg/m(0.238(lbs/ft))
x 0.266kg/m(0.179(lbs/ft))
x 0.173kg/m(0.116(lbs/ft))
x 0.118kg/m(0.079(lbs/ft))
x 0.061kg/m(0.041(lbs/ft))
x 0.022kg/m(0.015(lbs/ft))
Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5kW -1ea, Ceiling concealed
Duct 7.3kW-2ea,
Wall Mounted 2.3kW-4ea
CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12kg (4.67lbs)
Attach the additional refrigerant table of IDU.
WARNING
• Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following
equation for human safety.
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 2m(6.56ft) from the floor (Wall
mounted type ’ Cassette type)
• Adoption of ventilation system
: choose ordinary ventilation system or building ventilation sys-
tem
• Limitation in piping work
: Prepare for earthquake and thermal stress
!
Volume of the room at which Indoor Unit of
the least capacity is installed
Total amount of refrigerant in the system
0.44(kg/m
3
(0.028(lbs/ft
3
))
Gas pipe
Liquid pipe
Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
WARNING
• Pipe to be vacuumed : gas pipe, liquid pipe
• If the refrigerant amount is not exact, it may not operate
properly.
• If additionally bottled refrigerant amount is over 10%, condenser
burst or insufficient indoor unit performance may be caused.
!
Refrigerant charging
CF value of Outside unit (ARWN*DAS4)
CF Capacity (HP)
-1.1 kg 8, 10, 12, 14
2.3 kg 16, 18, 20
CF value of Outside unit (ARWN*BAS4)
CF Capacity (HP)
-1.1 kg 8, 10, 12, 14,16
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