Table of Contents
Advertisement
1-5. Tubing Size
Simultaneous operation multi (Twin, Triple, Double-Twin)
NOTE
Because the indoor units run simultaneously, install them within the same room.
Table 1-6 Table for Managing Tubing Length and Height Differential
Item
Maximum
allowable tubing
length
Allowable
Maximum
tubing
distribution tubing
lengths
length
Sum Total Length
Maximum branch tubing length
Maximum difference between lengths of No. 1 distribution tubing
(double twin)
Maximum indoor-
Maximum
outdoor height
allowable
difference
height
difference
Maximum height difference between indoor units
* For connection tubing sizes, refer to Table 1-7.
Twin
Main
tubing L
1
Double-Twin
Main
tubing L
1
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).
Big_PAC_eng.indb 9
Big_PAC_eng.indb 9
Contents
One-way length of tubing from
outdoor unit to the most distant
indoor unit
Maximum length following the first
branch point (No. 1 distribution)
Maximum length following the
second branch point (double twin)
Maximum allowable tubing length
and the sum total of other tubing
Difference between the maximum
length and minimum length in
tubing following the first branch
point
If outdoor unit is higher
If outdoor unit is lower
Triple
A
Distribution joint
2
A
Distribution joint No. 1
L1
L2
C
Distribution joint No. 2
2
Distribution joint
3
No. 2
4
Symbol
Twin
Triple
Double-Twin
L + 1
L + 1, L + 2,
L + L1 + 1, L + L1 + 2
L + 2
L + 3
L + L2 + 3, L + L2 + 4
L1 + 1, L1 + 2
1, 2
1, 2, 3
L2 + 3, L2 + 4
–
–
1, 2, 3, 4
L + L1 + L2 + 1 + 2
–
L + 1 + 2 + 3
+ 3+ 4
Max: L2 + 2
1 > 2
1 > 2 > 3
Min: L1 + 1
1 – 2
1 – 3
(L2 + 4) – (L1 + 1)
L2 > L1
–
–
L2 – L1
H1
H2
H2, H3, H4
H2, H3, H4, H5, H6, H7
Main
tubing L
B
Distribution tubing
1
3
2
A = NRF-D1668R
B = NRF-DL28R
C = NRF-DL16R
C
9
Actual length
(m)
≤100
≤20
≤15
≤120
≤10
≤10
≤30
≤0.5
Distribution joint
(purchase separately)
(more than 16kW, less than 68kW)
2009/08/26 16:33:06
2009/08/26 16:33:06
Advertisement
Table of Contents
