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English
Outdoor unit capacity type
Liquid pipe
Main pipe
Upsize the liquid pipe
First refrigerant
branch kit
Branch
Selector
units
Indoor
units
Outdoor units
REYQ72, 96X type
φ
3/8 in. (9.5 mm)
→
φ
1/2 in. (12.7 mm)
REYQ120, 144X type
φ
1/2 in. (12.7 mm)
→
φ
5/8 in. (15.9 mm)
REYQ168-240X type
φ
5/8 in. (15.9 mm)
→
φ
3/4 in. (19.1 mm)
REYQ264-456X type
φ
3/4 in. (19.1 mm)
→
φ
7/8 in. (22.2 mm)
(*7) It can be extended to ≤295 ft. (90 m) with liquid piping of main pipe size up (see table size up for equivalent length from outdoor to indoor units
over 295 ft. (90 m) in this page) (if outdoor unit is lower than indoor unit, ≤195 ft. (60 m) by field setting [2-35] on page 33). See [2-49]=Height
difference setting on page 34.
(*8) For Branch Selector unit connected in pass through installation, all three conditions below must be satisfied.
1. Maximum capacity index of connectable indoor units for BSF6, 8Q54T
*
is ≤162 per Branch Selector unit.
2. Maximum capacity index of connectable indoor units under Branch Selector units connected in pass through is ≤230.
3. Total number of ports of Branch Selector units connected in pass through is ≤12.
(*9) When conditions listed in the table below are all satisfied, the allowable length restrictions after branch is ≤295 ft. (90 m). For Branch Selector
unit connected in pass through installation, also (*8) must be satisfied.
Necessary conditions
Example: Only the allowable length after branch for the indoor unit
9
exceeds 130 ft. (40 m) in the
figure in the lower right
1. Upsize the liquid pipe from the first
refrigerant branch kit to the final
refrigerant branch kit for the indoor
unit beyond 130 ft. (40 m).
•
If upsizing is impossible, the condi
-
tions are not satisfied.
•
If the upsized line would become
larger than the main pipe, then the
main pipe should also be upsized.
Upsize the liquid pipes b, c, d, e, f and g in the
figure in the right.
The upsizing specifications should be as fol
-
lows:
φ
3/8 in. (9.5 mm)
→
φ
1/2 in. (12.7 mm)
φ
1/2 in. (12.7 mm)
→
φ
5/8 in. (15.9 mm)
φ
5/8 in. (15.9 mm)
→
φ
3/4 in. (19.1 mm)
φ
3/4 in. (19.1 mm)
→
φ
7/8 in. (22.2 mm)
C
REFNET joints
G
b
d
m
B
f
A
c
D
9
H
e
g
6
h
n
F
i
4
Outdoor unit
3
a
7
E
5
1
8
(A-G)
p
Indoor unit (1-9)
j
k
B1
B2
B3
B4
B5
B6
B7
2
s
r
q
Branch Selector units (B1-B7)
b+c+d+e+f+g+p>130 ft. (40 m)
From outdoor unit to the farthest indoor unit
9
From outdoor unit to the nearest indoor unit
1
2.
The total piping length, calculated by
doubling the piping length as upsized
in 1 above, is ≤3280 ft. (1000 m).
(The main pipe, and lines that are
not upsized, should not be doubled.)
a +
b×2+c×2+d×2+e×2+f×2+g×2
+h+i+j+k+l+m+n+p+q+r+s
≤3280 ft. (1000 m)
3. The actual piping length from each
indoor units to the nearest refriger
-
ant branch kit are all ≤130 ft. (40 m).
•
i, j ∙∙∙, p≤130 ft. (40 m)
•
h+q+r≤130 ft. (40 m)
•
h+q+s≤130 ft. (40 m)
4. The difference between the actual
piping length from the outdoor unit
to the farthest indoor unit, and the
actual piping length from the outdoor
unit to the nearest indoor unit, is
≤130 ft. (40 m).
Actual piping length of
9
Actual piping length of
1
(a+b+c+d+e+f+g+p) − (a+h+q+r)
≤130 ft. (40 m)
In the case of a multi Branch Selector unit, if a junction pipe kit (separately sold) is used for combining 2 lines, the actual piping length between the
multi Branch Selector unit and the indoor units should be ≤65 ft. (20 m).
This limitation can be extended beyond 65 ft. (20 m), if all of the three conditions below are satisfied.
1. Upsize the liquid line between the joined 2 branches and the indoor unit.
2. Actual pipe length between the multi branch selector box and the indoor unit needs to be ≤130 ft. (40 m).
3. Double the pipe length of upsized line between joined 2 branches and the indoor unit, when calculating the overall total piping length.
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