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English
Allowable
length after
branch (*5)
From branch to indoor
unit via 1 Branch
Selector unit
Actual piping length
Actual piping length from the first REFNET joint or REFNET header to indoor
unit: ≤130 ft. (40 m) (*9)
(Example) 4
: e+h+j≤130 ft. (40 m),
7
: b+c+d+m+n+p≤130 ft. (40 m)
From branch to indoor
unit via Branch Selec-
tor units connected in
pass through
Actual piping length from the first REFNET joint or REFNET header to indoor
unit: ≤130 ft. (40 m) (*8) (*9)
(Example)
11
: b+r+u+w≤130 ft. (40 m)
(*4) In the case of an outdoor units multi system, “outdoor unit” should be read as the “first outdoor unit multi connection piping kit”, seen from the
indoor units side.
(*5) A multi Branch Selector unit is to be considered as a branch (a single Branch Selector unit is not), so in the case where only 1 multi Branch Se
-
lector unit is included in the system, the actual piping length from each branch port of the multi Branch Selector unit to each indoor units should
be ≤130 ft. (40 m).
(*6) In the case where the equivalent piping length from outdoor units to indoor units ≥295 ft. (90 m), make sure to upsize the liquid pipe of the main
pipe (see the figure below), referring to the table below. (Do not upsize the high/low pressure gas pipe and the suction gas pipe.)
Outdoor unit capacity type
Liquid pipe
Main pipe
Upsize the liquid pipe
First refrigerant
branch kit
Branch
Selector
units
Indoor
units
Outdoor units
RELQ 72,96 T type
φ
3/8 in. (9.5 mm)
→
φ
1/2 in. (12.7 mm)
RELQ 120,144 T type
φ
1/2 in. (12.7 mm)
→
φ
5/8 in. (15.9 mm)
RELQ 192,240 T type
φ
5/8 in. (15.9 mm)
→
φ
3/4 in. (19.1 mm)
(*7) It can be extended to ≤295 ft. (90 m) (if outdoor unit is lower than indoor unit, ≤195 ft. (60 m) by field setting [2-35] on page 34). See
[2-49]=Height difference setting on page 35.
(*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.
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2023/05/29 11:59:33
2023/05/29 11:59:33