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I - 2
2. Limitations on refrigerant tubing length
(1) System tubing
c
Limitations on refrigerant tubing length
When T-tee branch tubing is
used (header branch method)
No. 1 branch
40 cm or less
40 cm or less
Used for
expansion
Symbols
Branch tube
(APR purchased separately)
Ball valve (purchased separately)
T-tee (provided by installer)
Closed (pinch) weld
Table 1-1 Ranges for Refrigerant Tubing Length and Installation Height Difference
450
560
710
850
450×2 450+560 560×2 450+710
560+710
710×2
Equivalent Horsepower
16
20
25
30
32
36
40
41
45
50
Ratio of capacity for indoor unit to
outdoor units
50 – 200%
50 –
170%
Min: Across the system, a minimum outdoor unit capacity of 50%
Max: Total capacity of 130% with 2 outdoor units
Minimum capacity of indoor units
that can be connected
Type 22 or greater (equivalent to 0.8 horsepower)
Maximum number of indoor units
that can be connected (per system)
24
32
48 (A maximum of 24 indoor units can be connected per 1
outdoor unit)
* The number of indoor units that can be connected when a W-multi outdoor unit is installed by itself is 24 units or
fewer.
d
Ranges for Refrigerant Tubing Length and Installation Height Difference
Category
Symbol
Description
Tubing length (m)
Allowable tubing
length
L1
Max. allowable tubing length
≤
170
(equivalent length 200)
∆
L=
(L2 – L4)
Difference between longest and shortest tubing lengths after
the No. 1 branch (
fi
rst branching point)
≤
70
LM
Max. length for main tube (tube with widest diameter)
7
≤
LM
≤
120
ℓ
1,
ℓ
2...
ℓ
48
Max. length for each tube branch
≤
30
L5
Distance between outdoor units
≤
7
Allowable height
difference
H1
Max. height difference between
indoor and outdoor units
If outdoor unit is above
≤
50
If outdoor unit is below
≤
35
(*1)
H2
Max. height difference between indoor units
≤α
(*2)
H3
Max. height difference between outdoor units
1
Allowable length
for branched tubing
(header branch)
L3
Max. length between
fi
rst T-tee branch (provided by installer)
and the closed tube end
≤
2
(*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
fi
rst branch.
α
=35-
∆
L/2 (however, 0
≤α≤
15)
W̲01.indd 2
W̲01.indd 2
2012/09/05 13:32:16
2012/09/05 13:32:16