– I-73 –
Tubing Length
•
Refrigerant tubing between the indoor and outdoor
units should be kept as short as possible.
•
The length of the refrigerant tubing between thein-
door and outdoor units is restricted by the eleva-
tion difference between the 2 units. This means
that the more “uphill” 1 unit is from the other, the
shorter the tubing must be. As you install the
tubing, try to make both the tubing length (L) and
the elevation (H) as short as possible. Refer to Fig.
1-2 and Table 1-1 for more information.
Fig. 1-2
Tubing length (L)
INDOOR
UNIT
OUTDOOR
UNIT
Elevation difference (H)
0711_M_I
No additional charge of compressor oil is necessary.
*
1
If total tubing length becomes a) 15 to 40 m, b) 15 to 50 m (max.), charge additional refrigerant (R22) by a)
25 or b) 80 g/m.
25 type
6.35 (1/4)
15.88 (5/8)
40
40
25
15
a) 25
2.4 (3.0 *
2
)
Tubing size
Narrow tube
mm(in.)
outer dia.
Wide tube
mm (in.)
Limit of tubing length
(m)
(m)
Limit of elevation
difference between
the 2 units
(m)
Max. allowable tubing length at shipment
(m)
Required additional refrigerant *
1
(g/m)
Refrigerant charged at shipment
(kg)
36 type
9.52 (3/8)
19.05 (3/4)
50
50
30
15
b) 80
4.0
48 type
9.52 (3/8)
19.05 (3/4)
50
50
30
15
b) 80
4.3
Models
Tubing Data
Outdoor unit is higher
than indoor unit
Outdoor unit is lower
than indoor unit
Tabel 1-1
For 50Hz models
*
2
CR254EL8 (low ambient temperature model) only.
1-11. Installation Instruction
