System Configuration - Fujitsu AIRSTAGE AJ 090LALDH Series Installation Manual

• To minimize vibration, do not install the outdoor unit directly on the ground.
Instead, install it on top of a firm platform (such as concrete block). (Fig. B)
• The foundation base should be able to support the product and the foot width of the
product should be more than 46.5 mm.
• Depending on the installation condition, vibration during the operation of the unit may
cause noise and vibration.
Install vibration-proofing materials (such as rubber pads).
• Consider the removal space of the connection piping when installing the foundation.
• Secure the equipment firmly with anchor bolts, washers, and nuts.
Fig. B
PROHIBITED GOOD
*Do not use a four-corner support foundation.
Fig. C
When installing piping from the
bottom of the outdoor units, the
required space under the outdoor
unit ≥ 200 mm.
* Install the branch kit horizontally.

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 primary 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: Primary ≥ Subordinate]
• 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 primary 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
• Total refrigerant amount: 31.5 kg or less
GOOD
Bolt (M10)
CAUTION
(Primary)
Outdoor unit
Indoor unit
165 m or less
90 m or less
f(p) - g(q)
60 m or less
700 m or less
50 m or less
40 m or less
15 m or less
4.1.2 In case of 2 outdoor units connected
Allowable pip length (actual pipe length)
Between primary 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
• Total refrigerant amount: 63 kg or less
• Outdoor unit capacity: Primary ≥ Subordinate
4.1.3 In the case of 3 outdoor units connected
(Primary)
a + f
a + p
Allowable pip length (actual pipe length)
Between primary outdoor unit and the farthest indoor
f, p
unit
Between the first separation tube and the farthest
indoor unit
Total
(Farthest indoor unit) - (Closest indoor unit)
Total pipe length
Between outdoor unit and outdoor unit branch kit
H1
Between the farthest outdoor unit and the first out-
door unit branch kit
H2, H3
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
• Total refrigerant amount: 94.5 kg or less
• Outdoor unit capacity: Primary ≥ Subordinate 1 ≥ Subordinate 2
(Subordinate)
(Primary)
Outdoor unit
Indoor unit
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
(Subordinate 2)
(Subordinate 1)
Outdoor unit
Indoor unit
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
a + e + f
a + e + p
f, p
f(p) - g(q)
Total
a, b
H1
H2, H3
H4
a + e + f
a + e + p
f, p
f(p) - g(q)
Total
a, b, c
b + d
c + d
H1
H2, H3
H4
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