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20
- Apply Oil Trap as shown below when the length of the pipe between
the outside unit s is more than 2m(6.6ft). Otherwise, the unit may not
operate properly.
(Example 1)
2m(6.6ft)
Toward indoor unit
(Example 2)
2m(6.6ft)
Toward indoor unit
2m(6.6ft)
- When connecting the pipes between the outside unit s, the accumu-
lation of oil in the slave outside unit should be avoided. Otherwise,
the unit may not operate properly.
(Example 1)
Toward indoor unit
(Example 2)
Toward indoor unit
(Example 3)
Toward indoor unit
Oil Trap
Toward
indoor unit
h
Oil Trap
h
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.
=
Additional charge(kg)
Total liquid pipe : Ø25.4 mm (1.0 inch)
+
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)
+
Number of installed HR units
CF value of indoor unit
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.
!
CAUTION
Use only 2-series of indoor unit. Ex) ARNU***2/A
h
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))
x 5kg(1.1lbs)
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