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4. SYSTEM CONFIGURATION
For detailed information, refer to the Design and Technical Manual.
4.1. System confi guration
CAUTION
• When connecting multiple outdoor units, set the nearest outdoor unit to the indoor unit
on the refrigerant pipe as the master unit.
• When connecting multiple outdoor units, install the outdoor unit with the largest
nominal system capacity nearest to the indoor unit on the refrigerant pipe, followed by
those with less nominal system capacities.
[Capacity: Master ≥ Slave]
• Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the
total amount of refrigerant when charging will lead to malfunction.
4.1.1 In case of 1 outdoor unit connected
(Master)
Outdoor unit
RB unit
Indoor unit
(*1: Cooling only)
Allowable pipe length (actual pipe length)
Between master outdoor unit and the farthest indoor
unit
165 m or less
a + f
a + p
Between the first separation tube and the farthest
indoor unit
90 m or less
f, p
(Farthest indoor unit) - (Closest indoor unit)
60 m or less
f(p) - g(q)
Total pipe length
700 m or less
Total
Allowable height difference
Between outdoor unit and indoor unit (When indoor
unit is installed below)
50 m or less
H1
Between outdoor unit and indoor unit (When outdoor
unit is installed below)
40 m or less
Between indoor units
15 m or less
H2, H3
Between RB unit and indoor unit
5 m or less
H4
Between RB units
15 m or less
H5
• Total refrigerant amount: 35 kg or less
4.1.2 In case of 2 outdoor units connected
(Slave)
(Master)
(*1: Cooling only)
Outdoor unit
RB unit
Indoor unit
Allowable pip length (actual pipe length)
Between master outdoor unit and the farthest indoor
unit
165 m or less
a + e + f
a + e + p
Between the first separation tube and the farthest
indoor unit
90 m or less
f, p
(Farthest indoor unit) - (Closest indoor unit)
60 m or less
f(p) - g(q)
Total pipe length
1000 m or less
Total
Between outdoor unit and outdoor unit branch kit
3 m or less
a, b
Allowable height difference
Between outdoor unit and indoor unit (When indoor
unit is installed below)
50 m or less
H1
Between outdoor unit and indoor unit (When outdoor
unit is installed below)
40 m or less
Between indoor units
15 m or less
H2, H3
Between outdoor units
0.5 m or less
H4
Between RB unit and indoor unit
5 m or less
H5
Between RB units
15 m or less
H6
• Total refrigerant amount: 70 kg or less
• Outdoor unit capacity: Master ≥ Slave
4.1.3 In the case of 3 outdoor units connected
(Slave 2)
(Slave 1)
(Master)
(*1: Cooling only)
Outdoor unit
RB unit
Indoor unit
Allowable pip length (actual pipe length)
Between master outdoor unit and the
farthest indoor unit
165 m or less
a + e + f
a + e + p
Between the first separation tube and the farthest
indoor unit
90 m or less
f, p
(Farthest indoor unit) - (Closest indoor unit)
60 m or less
f(p) - g(q)
Total pipe length
1000 m or less
Total
Between outdoor unit and outdoor unit branch kit
3 m or less
a, b, c
Between the farthest outdoor unit and the first out-
door unit branch kit
12 m or less
b + d
c + d
Allowable height difference
Between outdoor unit and indoor unit (When indoor
unit is installed below)
50 m or less
H1
Between outdoor unit and indoor unit (When outdoor
unit is installed below)
40 m or less
Between indoor units
15 m or less
H2, H3
Between outdoor units
0.5 m or less
H4
Between RB unit and indoor unit
5 m or less
H5
Between RB units
15 m or less
H6
• Total refrigerant amount: 105 kg or less
• Outdoor unit capacity: Master ≥ Slave 1 ≥ Slave 2
NOTE:
• If the outdoor temperature during cooling operation is expected to be
–5 °C or less, outdoor unit must be installed lower than 5 m or less from the indoor unit.
• Please refer to “8.3.2. Checking total amount of refrigerant and calculating the amount
of refrigerant charge to be added” for the total amount of refrigerant.
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3/6/2020 11:55:22 AM
