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1-5. Tubing Length
Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown in the figure below.
1.
Main tubing length (maximum tubing size) LM = LA + LB ...
2.
Main distribution tubes LC – LH are selected according to the capacity after the distribution joint.
3.
Sizes of indoor unit connection tubing 1 – 13 are determined by the connection tubing sizes on the indoor units.
LM
LA
1st distribution joint
LF
LG
N O T E
* Be sure to use special R410A distribution joints (CZ: optional parts) for tubing branches.
Table 2 : Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item
Allowable tubing
length
Allowable elevation
difference
Allowable length of
joint tubing
N O T E
0: In case that the total value of connected indoor units exceeds 1.200, increase the size of the main tube (LM) by 1 rank for liquid
tube. (Table 2-3)
How to calculate total value of indoor units:
Select the value in Table 2-2 from the type and capacity of connected indoor units.
Then, calculate the total value for the connected indoor units.
*1: If the longest tubing length (L1) exceeds 90 m (equivalent length), increase the sizes of the main tubes (LM) by 1 rank for gas tubes
and liquid tubes. Use a field supply reducer. Select the tube size from the table of main tubing sizes (Table 3) and from the table of
refrigerant tubing sizes (Table 7).
*2: If the longest main tubing length (LM) exceeds 50 m, increase the main tubing size at the portion before 50 m by 1 rank for the gas
tubes. Use a field supply reducer. Determine the length less than the limitation of allowable maximum tubing length.
For the portion that exceeds 50 m, set based on the main tubing size (LA) listed in Table 3.
*3: When the tubing length exceeds 40 m, increase a longer liquid or gas tubing by 1 rank.
Refer to the Technical Data for the details.
*4: If any of the tubing length exceeds 30m, increase the size of the liquid and gas tubes by 1 rank.
5: If the size of the existing tubing is already larger than the standard tubing size, it is not necessary to further increase the size.
* If the total amount of refrigerant for the system exceeds 24 kg, change the size of the tubing to reduce the amount of refrigerant.
LC
LD
LB
4
Max. 40cm
For
extension
For
extension
Max. 40cm
LH
1
L4
Mark
L1
Max. tubing length
Difference between max. length and min.
∆
L (L2 – L4)
length from the 1st distribution joint
Max. length of main tubing (at maximum size)
LM
Even after 1st distribution joint, LM is allowed if at
*
maximum tubing length.
1, 2~ 13
Max. length of each distribution tube
L1 + 1 + 2~ 12
Total max. tubing length including length of each distribution
+ LF + LG + LH
tube (only liquid tubing)
When outdoor unit is installed higher than indoor unit
H1
When outdoor unit is installed lower than indoor unit
H2
Max. difference between indoor units
T-joint tubing (fi eld-supply); Max. tubing length between the
L3
fi rst T-joint and solidly welded-shut end point
L1
L2
3 L
5
11
12
13
2
3
Contents
10
Explanation of symbols
Distribution joint
(CZ: optional parts)
Ball valve (field supply)
T-joint (field supply)
H1
Solidly welded shut
(pinch weld)
R410A distribution joint
CZ-P160BK2
H2
CZ-P680BK2
Length
150*
Actual length
Equivalent length
175*
L = Length H = Height
Unit: m
1
1
3
50*
2
- *
4
50*
300
50
40
15
2
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