Limitations On Refrigerant Tubing Length - Panasonic 2WAY MULTI U-16GE3E5 Test Run Manual

2. Limitations on refrigerant tubing length

< 2WAY Multi/W Multi Models>
(1) System tubing
 Limitations on refrigerant tubing length
No. 1 branch
Table 1-1 System Limitations
Outdoor unit types of the
system
Equivalent Horsepower
Ratio of capacity for indoor
unit to outdoor units
Minimum capacity of
indoor units that can be
connected
Maximum number of
indoor units that can be
connected (per system)
 Ranges for Refrigerant Tubing Length and Installation Height Difference
Category
Allowable tubing
length
Allowable height
difference
Allowable length
for branched tubing
(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≤α≤15)
When T-tee branch tubing is
used (header branch method)
40 cm or less
Used for
expansion
40 cm or less
45.0 56.0 71.0 85.0
16 20 25 30
50 –
50 – 200%
170%
26 33 41 50
Symbol
L1 Max. allowable tubing length
∆L= Difference between longest and shortest tubing lengths after
(L2 – L4) the No. 1 branch (first branching point)
LM Max. length for main tube (tube with widest diameter)
ℓ1, ℓ2...ℓ48 Max. length for each tube branch
L5 Distance between outdoor units
Max. height difference between
H1
indoor and outdoor units
H2 Max. height difference between indoor units
H3 Max. height difference between outdoor units
Max. length between first T-tee branch (provided by installer)
L3
and the closed tube end
45.0×2 45.0+56.0 56.0×2 45.0+71.0 56.0+71.0 71.0×2 71.0×85.0 85.0×2
32 36 40
Min: Across the system, a minimum outdoor unit capacity of 50%
Max: Total capacity of 130% with 2 outdoor units
Type 22 or greater (equivalent to 0.8 horsepower)
52 59
Description
If outdoor unit is above
If outdoor unit is below
I - 2
Symbols
Branch tube
(APR purchased separately)
Ball valve (purchased separately)
T-tee (provided by installer)
Closed (pinch) weld
41 45 50
64
Tubing length (m)
(equivalent length 200)
7≤LM≤120
55 60
≤170
≤70
≤30
≤7
≤50
(*1)
≤35
(*2)
≤α
1
≤2