System Configuration - Fujitsu Airstage AJ 072GALBH Series Installation Manual

4. SYSTEM CONFIGURATION

For detailed information, refer to the Design and Technical Manual.
4.1. System confi guration
• 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
Allowable pipe length (actual pipe length)
Between master outdoor unit and the farthest indoor
unit
Between the first separation tube and the farthest
indoor unit
(Farthest indoor unit) - (Closest indoor unit)
Total pipe length
Allowable height difference
Between outdoor unit and indoor unit (When indoor
unit is installed below)
Between outdoor unit and indoor unit (When outdoor
unit is installed below)
Between indoor units
Between RB unit and indoor unit
Between RB units
• Total refrigerant amount: 35 kg or less
4.1.2 In case of 2 outdoor units connected
(Master)
CAUTION
(Master)
Outdoor unit
RB unit
Indoor unit
(*1: Cooling only)
165 m or less
90 m or less
60 m or less f(p) - g(q)
700 m or less
50 m or less
40 m or less
H2, H3
15 m or less
5 m or less
15 m or less
(Slave)
Outdoor unit
RB unit
Indoor unit
(*1: Cooling only)
Allowable pip length (actual pipe length)
Between master outdoor unit and the farthest indoor
unit
Between the first separation tube and the farthest
indoor unit
(Farthest indoor unit) - (Closest indoor unit)
Total pipe length
Between outdoor unit and outdoor unit branch kit
Allowable height difference
Between outdoor unit and indoor unit (When indoor
unit is installed below)
Between outdoor unit and indoor unit (When outdoor
unit is installed below)
Between indoor units
Between outdoor units
Between RB unit and indoor unit
Between RB units
• Total refrigerant amount: 70 kg or less
• Outdoor unit capacity: Master ≥ Slave
4.1.3 In the case of 3 outdoor units connected
(Master)
a + f
a + p
f, p
Total
Allowable pip length (actual pipe length)
Between master outdoor unit and the
H1
farthest indoor unit
Between the first separation tube and the farthest
indoor unit
H4 (Farthest indoor unit) - (Closest indoor unit)
H5
Total pipe length
Between outdoor unit and outdoor unit branch kit
Between the farthest outdoor unit and the first out-
door unit branch kit
Allowable height difference
Between outdoor unit and indoor unit (When indoor
unit is installed below)
Between outdoor unit and indoor unit (When outdoor
unit is installed below)
Between indoor units
Between outdoor units
Between RB unit and indoor unit
Between RB units
• 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.
165 m or less
90 m or less
60 m or less
1000 m or less
3 m or less
50 m or less
40 m or less
15 m or less
0.5 m or less
5 m or less
15 m or less
(Slave 2)
(Slave 1) Outdoor unit
RB unit
Indoor unit
(*1: Cooling only)
165 m or less
90 m or less
60 m or less
1000 m or less
3 m or less
12 m or less
50 m or less
40 m or less
15 m or less
0.5 m or less
5 m or less
15 m or less
a + e + f
a + e + p
f, p
f(p) - g(q)
Total
a, b
H1
H2, H3
H4
H5
H6
a + e + f
a + e + p
f, p
f(p) - g(q)
Total
a, b, c
b + d
c + d
H1
H2, H3
H4
H5
H6
En-6