Tubing Length - Panasonic R410A: 5/16 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 figure below.
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.
L5
H3
C
B
Balance tubing
LO
(ø 1/4" )
Explanation of symbols
Distribution joint
(CZ : 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
L (L2 – L4)
Allowable tubing
LM
length
1, 2~ 40
L1 + 1 + 2~ 39 + A
+ B + LF + LG + LH
L5
H1
Allowable elevation
difference
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 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 1-8) on the second following page.)
3: If the longest main tube length (LM) exceeds 164 ft., increase the main tube size at the portion before 164 ft. by 1 rank for the
gas tubes. (Use a field supply reducer.)
(For the portion that exceeds 164 ft., set based on the main tube sizes (LA) listed in the table on the following page.)
4: If the size of the existing tubing is already larger than the standard tubing size, it is not necessary to further increase the size.
* If the existing tubing is used, and the amount of on-site additional refrigerant charge exceeds the value listed below, then
change the size of the tubing to reduce the amount of refrigerant.
Max. additional charge for 1 outdoor unit: 62 lbs
Max. additional charge for 2 outdoor units: 111lbs
262 ft
L1
L2
LM
A
LB LC LD
LA
5
4
For
LF extension
Max. 1.3 ft
For
extension
LH
Max. 1.3 ft
LG
1
L4
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 (field-supply); Max. tubing length between the
first T-joint and solidly welded-shut end point
8
L3
40
39
38
H2
3
2
and parts.
Contents
Actual length
Equivalent length
R410A 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
Length(ft.)
492
574
131
262*³
98
984
32
164
131
49
13
6.6