Panasonic 2WAY-Multi U-10MES2E8 Bedienungsanleitung Seite 8

Table 1-2 Ranges for refrigerant tubing length and installation height difference
Category Symbol
L1
DL=(L2-L4)
Allowable tubing
LM
length
ℓ1, ℓ2...ℓn
L5
Lb
H1
Allowable height
difference
H2
H3
Allowable length
for branched tubing L3
(header branch)
(*1) If cooling mode is expected to be used when the external temperature is 10°C or below, the maximum
length is 30 m.
(*2) The max/min permissible height between indoor units (α) is found by the difference ( L) between the
maximum length and the minimum length from the first branch.
α=35- L/2 (however, 0
The grouping of tubes that connect the outdoor units to the indoor units is referred to as the "main tubing."

When the maximum tubing length is more than 90 m (equivalent length), upgrade the tube size 1 rank for
both the liquid and gas tubes of the main tubing.
The prescribed performance cannot be guaranteed if the wrong size is selected.
If the total amount of refrigerant (Required additional refrigerant charge + Quantity of refrigerant charge

when shipped) exceeds 80 kg, reduce the amount to 80 kg or less by changing the refrigerant tubing route.
Table 1-3 Outdoor tubing/main tubing size *
Outdoor/main tubing
Outdoor unit (gross) capacity (kW)
Gas tube (mm)
Liquid tube (mm)
*1 If there are plans for future expansion, choose plumbing sizes according to the total capacity after such
expansion. However, if tube size is stepped up 3 levels, expansion is not possible.
*2 If the maximum tube length exceeds 90 m (or equivalent length), use the figure in parentheses ( ) to
size the main tubing, along with those of the liquid and gas tubes.
Table 1-4 Main tube size after branching *
When indoor unit(s) are connected
– 5.6 – 16.0
Gas tube
Ø12.7 Ø15.88 Ø19.05 Ø22.22 Ø15.88
(mm)
Liquid
Ø9.52
tube (mm)
*1 Select a diameter for the main tubing after a branch that is no larger than that of the header.
(In cases where the main tubing after a branch would have to be larger than the header tubing, select
tubing of the same size, and never exceed the header size.)
*2 If the maximum tube length exceeds 90 m (or equivalent length), use the figure in parentheses ( ) to size
the main tube after branching, along with those of the liquid and gas tubes.
*3 "–* *" in the table above means "** kW or less".
Max. allowable tubing length
Difference between longest and shortest tubing lengths after the No. 1
branch (first branching point)
Max. length for main tube (tube with widest diameter)
Max. length for each tube branch
Distance between outdoor units
Max. length for balance tube
Max. height difference between
indoor and outdoor units
Max. height difference between indoor units
Max. height difference between outdoor units
Max. length between first T-tee branch (provided by installer) and the
closed tube end
α 15)
≤ ≤
*
1, 2
28
Ø22.22
Ø9.52
*
1, 2
Post-branching indoor unit capacity (kW)*
– 22.4 – 28.0 – 16.0 – 28.0
Ø22.22
(Ø25.4)
Ø9.52 (Ø12.7)
EN - 8
Description
If outdoor unit is above
If outdoor unit is below
Outdoor tubing
56
Ø28.58
Ø15.88
Main tube after branching
3
– 35.5 – 45.0 – 71.0
Ø25.4
Ø28.58 (Ø31.75)
(Ø28.58)
Ø15.88
Ø12.7 (Ø15.88)
(Ø19.05)
Tubing length (m)
≤170 (equivalent
length 200)
≤70
7≤LM≤120
≤30
≤7
≤10
≤50
≤35
(*1)
≤α
(*2)
1
≤2
Main tubing
85
Ø31.75 (Ø38.1)
Ø19.05 (Ø22.22)
– 101.0 – 110.5 – 221.0
Ø31.75
Ø38.1 (Ø44.45)
(Ø38.1)
Ø19.05 (Ø22.22) Ø22.22