1-5. Tubing Length - Panasonic U-72MF1U9 Installation Instructions Manual

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 fi gure below.
L5
H3
C
B
Balance tubing
LO
(ø 3/8" )
Explanation of symbols
Distribution joint
(purchased separately)
Ball valve (field supply)
T-joint (field supply)
Solidly welded shut
(pinch weld)
Note: Do not use commercially available T-joints for the liquid tubing
* Be sure to use special R410A distribution joints (CZ: purchased separately) for outdoor
unit connections and tubing branches.
Table 1-2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item Mark
L1
ΔL (L2 – L4)
Allowable
LM
tubinglength
1, 2... 40
L1+ 1+ 2... 40+
A+ B+LF+LG+LH
L5
H1
Allowable
elevationdifference
H2
H3
Allowable length of
L3
joint tubing
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. (equivalent length), increase the sizes of the main tubes (LM) by 1
rank for the discharge tubes, suction tubes, and narrow tubes. (fi eld supplied)
3: If the longest main tube length (LM) exceeds 164 feet, increase the main tube size at the portion before 164 ft. by 1
rank for the suction tubes and discharge tubes. (fi eld supplied)
(For the portion that exceeds 164 feet, set based on the main tube sizes (LA) listed in the table on the following page.)
1. Main tubing length 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 – 40 are determined by the connection
tubing sizes on the indoor units.
LM
A
LB LC LD
LA
4
For
LF extension
Max. 1.3 ft
For
extension
LH
Max. 1.3 ft
LG
1
L4
and
Contents
Max. tubing length
Difference between max. length and min. length from
the No. 1 distribution joint
Max. length of main tubing (at max. diameter)
Max. length of each distribution tube
Total max. tubing length including length of each
distribution tube (only liquid tubing)
Distance between outdoor units
When outdoor unit is installed higher than indoor unit
When outdoor unit is installed lower than indoor unit
Max. difference between indoor units
Max. difference between outdoor units
T-joint tubing (fi eld-supply); Max. tubing length between
the fi rst T-joint and solidly welded-shut end point
8
262 ft
L1
L2
T-joint tubing
(header joint system)
LE L3
40
5 6
7
Solenoid valve kit
3
2
R410A distribution joint
CZ-P900PH1U (for outdoor unit)
parts.
CZ-P224BH1U (for indoor unit)
CZ-P680BH1U (for indoor unit)
CZ-P1350BH1U (for indoor unit)
Length (ft.)
≤ 492
Actual length
≤ 574
Equivalent length
≤ 131
≤ 262*²
≤ 98
≤ 984
≤ 32
≤ 164
≤ 131
≤ 49
≤ 13
≤ 6.6
H1
H2