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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 show in the figure below.
H3
C
Balance tubing
(ø1/4" (6.35mm))
No.1 distribution joint for outdoor unit
No.1 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 1-2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item
Allowable tubing
length
L1 + 1 + 2~ 63 + A
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 295 ft. (90m) (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 tube sizes (Table 1-3) on the
following page (LA table), and from the table of refrigerant tubing sizes (Table 1-9) on the second following page.)
3: If the longest main tubing length (LM) exceeds 164 ft. (50m), increase the main tube size at the portion before 164 ft. (50m) by 1
rank for the gas tubes. (Use a field supply reducer.)
(For the portion that exceeds 164 ft. (50m), set based on the main tube sizes (LA) listed in the table on the following page.)
4: If the tubing length marked "L" (L2 - L4) exceeds 131 ft. (40m), increase the liquid tube and gas tube by 1 rank.
5: If the total distribution tubing length exceeds 1,640ft. (500m), maximum allowable elevation difference (H2) between the indoor
units is calculated by the following formula. Make sure the indoor unit's actual elevation difference should fall within the figure
calculated as follows.
Unit of account (feet): 49 x (2 - total tubing length(ft.) ÷ 1,640) or Unit of account (meter): 15 x (2 - total tubing length(m) ÷ 500)
6: If any of the tubing length exceeds 98ft. (30m), increase the size of the liquid and gas tubes by 1 rank.
00_302411_EN.indd 8
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. 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 – 64 are determined by the connection tubing sizes on the indoor units.
LM
B
A
LA
LO
LC
LD
LB
For
extension
LF
Max.1.3 ft (40cm)
For
extension
Max.1.3 ft (40cm)
LH
LG
L4
Mark
L1
Max. tubing length
Difference between max. length and min.
L (L2 – L4)
length from the No.1 distribution joint
LM
Max. length of main tubing (at maximum size)
1, 2~ 64
Max. length of each distribution tube
Total max. tubing length including length of each distribution
+ B + LF + LG + LH
tube (only liquid tubing)
Maximum tubing length from outdoor's 1st distribution
A, B + LO, C + LO
joint to each outdoor 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
L3
first T-joint and solidly welded-shut end point
L1
L2
L
3
64
5
63
4
62
3
2
1
Contents
Actual length
Equivalent length
8
R410A optional distribution joint
CZ-P680PJ1U (for outdoor unit)
CZ-P1350PJ1U (for outdoor unit)
CZ-P160BK1U (for indoor unit)
CZ-P680BK1U (for indoor unit)
CZ-P1350BK1U (for indoor unit)
H1
H2
unit: ft. (m)
Length
2
656 (200)*
2
689 (210)*
4
164 (50)*
-
3
*
6
164 (50)*
3280 (1000)
33 (10)
164 (50)
131 (40)
5
49 (15)*
13 (4)
L = Length
6.6 (2)
H = Height
2018/7/4 13:27:16
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