Tubing Length - Panasonic U-8ME1E8 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.
H3
C
B
Balance tubing
(ø6.35)
Explanation of symbols
Distribution joint
(APR: 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 (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
∆ L (L2 – L4)
Allowable tubing
length
L1+ 1+ 2... 63+
A+ B+LF+LG+LH
A, B+LO, C+LO
Allowable elevation
difference
Allowable length of
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 90 m (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 50 m, increase the main tube size at the portion before 50 m by 1 rank for the gas
tubes. (Use a field supply reducer.) Determine the length less than the limitation of allowable maximum tubing length.
(For the portion that exceeds 50 m, 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 refrigerant charge exceeds the value listed below, then change the size of
the tubing to reduce the amount of refrigerant.
Total amount of refrigerant for the system with 1 outdoor unit: 50 kg
Total amount of refrigerant for the system with 2 outdoor units: 80 kg
Total amount of refrigerant for the system with 3 outdoor units: 100 kg
5: When the tubing length exceeds 40m, increase a longer liquid or gas tubing by 1 rank.
Refer to the Technical Data for the details.
6: If the tubing length exceeds 500m, the formula is 15 x (2 - all tubing length/500). Determine the length less than the limitation of
allowable maximum tubing length.
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 – 64 are determined by the connection tubing sizes on the indoor units.
LM
A
LO
LB LC
LA
For
LF
extension
Max. 40cm
For
extension
Max. 40cm
LG
L4
Mark
L1 Max. tubing length
Difference between max. length and min.
length from the No.1 distribution joint
LM Max. length of main tubing (at max. diameter)
1, 2... 64 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
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
L3
the first T-joint and solidly welded-shut end point
L1
L2
LD L3
4 5 62
LH
3
2
1
and parts.
Contents
Actual length
Equivalent length
9
R410A distribution joint
CZ-P680PJ2 (for outdoor unit)
CZ-P1350PJ2 (for outdoor unit)
H1 CZ-P160BK2 (for indoor unit)
64
CZ-P680BK2 (for indoor unit)
63
CZ-P1350BK2 (for indoor unit)
H2
Length (m)
≤ 180
≤ 200
≤ 50 * 5
3
*
≤ 30
≤ 1000
≤ 10
≤ 50
≤ 40
≤ 15 *
6
≤ 4
≤ 2