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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.
H3
C
B
Balance tube
(6.35mm)
1st distribution joint for outdoor unit
1st distribution joint (for indoor unit)
Explanation of symbols
Distribution joint
(CZ: optional parts)
Ball valve (field supply)
T-joint (field supply)
Solidly welded shut
(pinch weld)
NOTE
* Be sure to use special R410A distribution joints (CZ: optional parts) for outdoor unit connections and tubing branches.
Table 2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item
Allowable tubing
length
L1 + 1 + 2~ 51 + A
+ B + LF + LG + LH
A, B + LO, C + LO
Allowable elevation
difference
Allowable length of
joint tubing
NOTE
1: The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that are connected to the tube
ends.
2: If the longest tubing length (L1) exceeds 90 m (equivalent length), increase the sizes of the main tubes (LM) by 1 rank for the suction
tubes, discharge 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 8).
3: 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 suction
tubes and discharge 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.
4: If the tubing length marked "L" (L2 - L4) exceeds 40 m, increase the tubing size at the portion after the 1st distribution joint by 1 rank for
the liquid tube, suction tube and discharge tube.
Refer to the Technical Data for the details.
1.
Main tubing length (maximum tubing size of discharge tube, suction tube and liquid tube) LM = LA + LB ...
2.
Main distribution tubes LC – LH are selected according to the capacity after the distribution joint.
3. The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that are
connected to the tube ends.
4.
Sizes of indoor unit connection tubing 1 – 52 are determined by the connection tubing sizes on the indoor units.
LM
A
LA
LO
LC
LD
LB
For
LF
extension
Max. 40cm
For
extension
Max. 40cm
LH
LG
L4
Mark
L1
Max. tubing length
Difference between max. length and min. length from the 1st
∆
L (L2 – L4)
distribution joint
Max. length of main tubing (maximum tubing size of discharge tube,
suction tube and liquid tube)
LM
Even after 1st distribution joint, LM is allowed if at maximum
*
tubing length.
1, 2~ 52
Max. length of each distribution tube
Total max. tubing length including length of each distribution tube (only
liquid tube)
Maximum tubing length from outdoor's 1st distribution joint to each
outdoor unit
1-2, 2-2~ 52-2
Max. length between solenoid valve kit and indoor unit
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
H3
Max. difference between outdoor units
T-joint tubing (field-supply); Max. tubing length between the first T-joint
L3
and solidly welded-shut end point
L1
L2
L3
51
5
6
50
Solenoid valve kit
4
3
1
2
Contents
10
R410A optional distribution joint
CZ-P680PH2 (for outdoor unit)
CZ-P1350PH2 (for outdoor unit)
CZ-P224BH2 (for indoor unit)
CZ-P680BH2 (for indoor unit)
CZ-P1350BH2 (for indoor unit)
H1
52
4-1
H2
2-1
3-1
2-2
Actual length
Equivalent length
L*, * = Length H* = Height
4
4-2
3-2
Unit: m
Length
2
200*
2
210*
4
50*
- *
3
5
50*
500
10
30
50
40
15
4
2
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