9
1-5. Tubing Size
(A) Single type
●
Refrigerant tubing between the indoor and outdoor units
should be kept as short as possible.
●
The lengths of the refrigerant tubes between the indoor and
outdoor units are limited by the elevation difference between
the 2 units. During tubing work, try to make both the tubing
length (L) and the difference in elevation (H1) as short as
possible. Refer to Table 1-5.
H1
Single
Main tubing L
Table 1-5
Outdoor unit type
18 type
Maximum allowable tubing length
40 m
Charge-less tubing length
(actual length)
3 – 30 m
Additional charge per 1 m
20 g
Outdoor unit type
25, 36 types
Maximum allowable tubing length
50 m
Charge-less tubing length
(actual length)
3 – 30 m
Additional charge per 1 m
40g
Outdoor unit type
48, 60 types
Maximum allowable tubing length
50 m
Charge-less tubing length
(actual length)
5 – 30 m
Additional charge per 1 m
40g
(B) Simultaneous operation multi (Twin, Triple, Double-Twin)
NOTE
Because the indoor units run simultaneously, install them within the same room.
Table 1-6
Item
Contents
Symbol
Actual
length
(m)
Single
Twin
Triple
Double-Twin
Allowable
tubing
lengths
Maximum allowable
tubing length
One-way length of tubing
from outdoor unit to the most
distant indoor unit
L
L + 1
L + 2
L + 1, L + 2
L + 3
L + L1 + 1, L + L1 + 2
L + L2 + 3, L + L2 + 4
50
Maximum distribution
tubing length
Maximum length following
the first branch point (No. 1
distribution)
–
1, 2
1, 2, 3
L1 + 1, L1 + 2
L2 + 3, L2 + 4
15
Maximum branch tubing length
Difference between the
maximum length and
minimum length in tubing
following the first branch point
–
1 > 2
1 – 2
1 > 2 > 3
1 – 2
1 – 3
2 – 3
Max: L2 + 4
Min: L1 + 1
(L2 + 4) – (L1 + 1)
10
Maximum difference between lengths of No. 1 distribution tubing
(double twin)
–
–
–
L2 > L1
L2 – L1
10
Maximum difference between lengths of No. 2 distribution tubing
(double twin)
–
–
–
2 > 1, 4 > 3
2 – 1, 4 – 3
10
Maximum
allowable
height
difference
Maximum indoor-
outdoor height
difference
If outdoor unit is higher
H1
30
If outdoor unit is lower
H1
15
Maximum height difference between indoor units
–
H2
H2, H3, H4
H2, H3, H4, H5, H6, H7
0.5
* For connection tubing sizes, refer to Table 1-6 above.
A
A
A
1
2
3
4
H1
H2
H3
H4
H6
H7
H5
L1
L2
A
1
2
2
1
3
B
H1
H1
H2
H2
H4
H3
Main
tubing L
Distribution joint No. 1
Distribution joint
No. 2
Distribution joint
(purchase separately)
A = NRF-DL16R
B = NRF-DL28R
Double-Twin
Main
tubing L
Main
tubing L
Distribution tubing
Distribution joint
Twin
Triple
NOTE
●
For refrigerant tube branches, use the optional distribution joints.
●
For cautions on the use of the optional distribution joints, be sure to refer to the provided instruction sheet. Also, be careful to install
them in the correct direction (orientation).
Airwell̲PAC-i̲eng.indb 9
Airwell̲PAC-i̲eng.indb 9
2009/07/09 16:13:15
2009/07/09 16:13:15
Содержание OU-PSINV-25HR
Страница 75: ...75 ...