Panasonic U-120MF2U9, Technical Data Manual, Page: 21 / 181

Design of 3WAY VRF SYSTEM
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1. Model Selection and Capacity Calculator
Design of 3WAY VRF SYSTEM
1. Model Selecting and Capacity Calculator
LO
LA
LF
LM
LB
LC
L2
L4
LG
3 L
LD
LH
H2
H3
H1
L1
2
1
6 5
A
B
C
50 51 52
1-3. 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.
NOTE
* Be sure to use special R410A distribution joints (CZ: optional parts) for outdoor unit connections and tubing branches.
Table 1 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
unit: ft. (m)
Item Mark Contents Length
Allowable tubing
length
L1 Max. tubing length
Actual length
656 (200)* 2
Equivalent length
689 (210)* 2
L (L2 – L4)
Difference between max. length and min.
length from the 1st distribution joint
164 (50)* 5
LM
Max. length of main tubing (at maximum size)
* Even after 1st distribution joint, LM is allowed if at
maximum tubing length.
*
3
1, 2~ 52 Max. length of each distribution tube
164 (50)* 6
L1 + 1 + 2~ 51 + A
+ B + LF + LG + LH
Total max. tubing length including length of each distribution
tube (only liquid tubing)
1640 (500)
A, B + LO, C + LO
Maximum tubing length from outdoor’s 1st distribution
joint to each outdoor unit
33 (10)
1-2, 2-2~ 52-2 Max. length between solenoid valve kit and indoor unit
98 (30)
Allowable elevation
difference
H1
When outdoor unit is installed higher than indoor unit
164 (50)
When outdoor unit is installed lower than indoor unit
131 (40)
H2 Max. difference between indoor units
49 (15)
H3 Max. difference between outdoor units
13 (4)
Allowable length of
joint tubing
L3
T-joint tubing (field-supply); Max. tubing length between the
first T-joint and solidly welded-shut end point
6.6 (2)
L = Length
H = Height
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 the suction
tubes, discharge tubes and liquid tubes. Use a field supply reducer. Select the tube size from the table of main tubing size (Table 2) and from
the table of refrigerant tubing size (Table 8).
*
3: If the longest main tubing length (LM) exceeds 164 ft. (50m), increase the main tubing size at the portion before 164 ft. (50m) by 1 rank for the
suction tubes and discharge tubes. Use a field supply reducer.
For the portion that exceeds 164 ft. (50m), set based on the main tubing size (LA) listed in Table 2.
4: When increasing the sizes of the main tubes (LM), it is not necessary to increase the rank for the discharge tubes of the outdoor unit 18, 20
and 22 ton.
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 – 52 are determined by the connection tubing sizes on the indoor units.
R410A optional distribution joint
CZ-P900PH1U (for outdoor unit)
CZ-P224BH1U (for indoor unit)
CZ-P680BH1U (for indoor unit)
CZ-P1350BH1U (for indoor unit)
Balance tubing
(ø1/4" (6.35mm))
Explanation of symbols
1st distribution joint for outdoor unit
1st distribution joint (for indoor unit)
Distribution joint
(CZ: optional parts)
For
extension
For
extension
Solenoid valve kit
Max.1.3 ft (40cm)
Max.1.3 ft (40cm)
Solidly welded shut
(pinch weld)
Ball valve (field supply)
T-joint (field supply)
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3-1
3-2
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TD831183-00_北米向け3WAY.indb 5 15/12/17 16:05:07