Technibel GRV250R5TAA Technical Data & Service Manual page 85

1-11 Installation Instructions
Tubing Length
(A) Single type
Refrigerant tubing between the indoor and
outdoor units should be kept as short as
possible.
The length of the refrigerant tubes between
the indoor and outdoor units are limited by the
elevation difference between the two units.
During tubing work, try to make both the
tubing length (L) and the difference in eleva-
tion (H) as short as possible. Refer to Table
1-1 for the details.
Table 1-1 (R407C Models)
Tubing Data
Tubing size Narrow tube
outer diameter Wide tube
Limit of tubing length
Outdoor unit is placed
Limit of elevation
upper
difference between
Outdoor unit is placed
the two units
lower
Max. allowable tubing length at shipment (m)
Required additional refrigerant *
Refrigerant charged at shipment
No additional charge of compressor oil is necessary.
1
* If total tubing length becomes 30 to 50 m, charge additional refrigerant (R407C) by a) 45 or b) 50 g/m.
Models GRV250(R/L)5TAA
GRV250(R/L)7TAA
mm (in.) 6.35 (1/4)
mm (in.) 15.88 (5/8)
(m) 50
50
(m)
30
(m)
30
1
(g/m) a) 45
(kg) 3.2
I - 99
1. Specifications
Installation Example 1
Tubing length (L)
INDOOR
UNIT
Elevation difference (H) OUTDOOR
UNIT
GRV360(R/L)7TAA GRV480(R/L)7TAA
9.52 (3/8)
19.05 (3/4)
50
50
30
30
b) 50
4.0
0419_M_I
9.52 (3/8)
19.05 (3/4)
50
50
1
30
30
b) 50
4.5
2
3
4
5