2-4
Design of W-2WAY ECO-i SYSTEM Unit Specifications
1
2
3
4
5
6
7
8
Explanation of symbols
Distribution joint
(APR: optional parts)
Solidly welded shut
(pinch weld)
Balance tubing
(F6.35)
Ball valve (field supply)
T-joint (field supply)
Note: Do not use commercially available T-joints for the liquid tubing and parts.
* Be sure to use special R410A distribution joints (APR: optional parts)
for outdoor unit connections and tubing branches.
L5
LO
LA
LF
LM
LB LC
L2
L4
LG
LD L3
LH
Max. 40cm
Max. 40cm
For
extension
For
extension
H2
H3
H1
L1
2
3
1
5
4
AB
C
38
39
40
1. Model Selecting and Capacity Calculator
1-3. 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 … 80 m
2. Main distribution tubes LC – LH are selected according to the capacity after the distri-
bution 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 L1 – L40 are determined by the connection tub-
ing sizes on the indoor units.
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.)
NOTE
Table 1-1 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item Mark Contents Length(m)
Allowable tubing
length
L1 Max. tubing length
Actual length
150
Equivalent length
175
L (L2 – L4)
Difference between max. length and min.
length from the No.1 distribution joint
40
LM Max. length of main tubing (at max. diameter)
80*³
1, 2~ 40 Max. length of each distribution tube 30
L1 +
1 + 2~ 39 + A
+ B + LF + LG + LH
Total max. tubing length including length of each distribution
tube (only liquid tubing)
300
L5 Distance between outdoor units 10
Allowable elevation
difference
H1
When outdoor unit is installed higher than indoor unit
50
When outdoor unit is installed lower than indoor unit
40
H2 Max. difference between indoor units
15
H3 Max. difference between outdoor units
4
Allowable length of
joint tubing
L3
T-joint tubing (field-supply); Max. tubing length between the
first T-joint and solidly welded-shut end point
2
L = Length, H = Height
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