Tubing Length - Panasonic U-72MF2U9 Technical Data Manual

1. Model Selecting and Capacity Calculator
1. Model Selection and Capacity Calculator

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.
1.
2.
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.
H3
C
B
LO
Balance tubing
(ø1/4" (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 1 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item
L (L2 – L4)
Allowable tubing
length
L1 + 1 + 2~ 51 + A
+ B + LF + LG + LH
A, B + LO, C + LO
1-2, 2-2~ 52-2
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 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.
Main tubing length (maximum tubing size) LM = LA + LB ...
Main distribution tubes LC – LH are selected according to the capacity after the distribution joint.
Sizes of indoor unit connection tubing 1 – 52 are determined by the connection tubing sizes on the indoor units.
LM
A
LA
LC
LD
LB
5
For
LF
extension
Max.1.3 ft (40cm)
Solenoid valve kit
For
extension
Max.1.3 ft (40cm)
LH
LG
1
L4
Mark
L1 Max. tubing length
Difference between max. length and min.
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~ 52 Max. length of each distribution tube
Total max. tubing length including length of each distribution
tube (only liquid tubing)
Maximum tubing length from outdoor's 1st distribution
joint to each outdoor unit
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
L3
first T-joint and solidly welded-shut end point
L1
L2
L 3
6 50 51 52
H2
4
3
2
Contents
Actual length
Equivalent length
2 - 5
Design of 3WAY VRF SYSTEM
Design of 3WAY VRF SYSTEM
R410A optional distribution joint
CZ-P900PH1U (for outdoor unit)
CZ-P224BH1U (for indoor unit)
CZ-P680BH1U (for indoor unit)
CZ-P1350BH1U (for indoor unit)
H1
4
4-1 4-2
2-1 3-1
3-2
2-2
unit: ft. (m)
Length
2
656 (200)*
2
689 (210)*
5
164 (50)*
3
*
6
164 (50)*
1640 (500)
33 (10)
98 (30)
164 (50)
131 (40)
49 (15)
13 (4)
L = Length
6.6 (2)
H = Height
1
2
3
4
5
6
7
8
9