Fujitsu AIRSTAGE K00250LW - 4. SYSTEM CONFIGURATION; 4.1. System Configuration Examples

En-7
Fig. C
More than 8 in
(200 mm)
When installing piping from the bottom of the outdoor units, the required
space under the outdoor unit should be ≥ 8 in (200 mm).
*Install the branch kit horizontally.
Do not install directly on the ground, this may result in equipment failure.
Provide ample space for ice buildup from condensate between the bottom of the unit
and the fl at surface on which it is mounted.
Otherwise, there is risk that the drainage water will freeze between the device and the
surface, disabling drainage.
Base
CAUTION
If the unit is installed in a region that is exposed to high
winds, freezing conditions, freezing rain, snow fall or heavy
snow accumulation, take appropriate measures to protect
it from those elements.
To ensure stable operation, the outdoor unit must be
installed on a raised stand or rack, at or above the antici-
pated snow depth for the region.
The installation of snow hoods and drift prevention fencing
is recommended when blowing and drifting snow is com-
mon to the region.
4. SYSTEM CONFIGURATION
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, fol-
lowed 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.
A) In case of 1 outdoor unit connected
Fig. A
O.U.
(Master)
O.U. :Outdoor unit
RB :RB unit
I.U. :Indoor unit
RB
RB RB RB RB
I.U. I.U. I.U. I.U. I.U.
I.U.
I.U.I.U.I.U.
RB RB RB
f
p
H3
H4
H5
H1
H2
*1
(*1: Cooling only)
a
• Allowable pipe length (actual pipe length)
Between master outdoor unit and the
farthest indoor unit
541 ft (165 m) or less
a+f
a+p
Between the fi rst separation tube and the
farthest indoor unit
196 ft (60 m) or less f, p
Total pipe length 2296 ft (700 m) or less Total
• Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
164 ft (50 m) or less
H1
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
131 ft (40 m) or less
Between indoor units 49 ft (15 m) or less H2, H3
Between RB unit and indoor unit 16 ft (5 m) or less H4
Between RB units 49 ft (15 m) or less H5
• Total refrigerant amount : 77.16 lbs (35.0 kg) or less
B) In case of 2 outdoor units connected
Fig. B
O.U.-2
(Slave)
O.U.-1
(Master)
f
e
a
H4
p
H3
H5
H6
H1
H2
*1
(*1: Cooling only)
b
O.U. :Outdoor unit
RB :RB unit
I.U. :Indoor unit
RB RB RB RB
RB RB RB RB
I.U.
I.U.I.U.I.U.
I.U. I.U. I.U. I.U. I.U.
• Allowable pipe length (actual pipe length)
Between master outdoor unit and the
farthest indoor unit
541 ft (165 m) or less
a+e+f
a+e+p
Between the fi rst separation tube and the
farthest indoor unit
196 ft (60 m) or less f, p
Total pipe length 3280 ft (1000 m) or less Total
Between outdoor unit and outdoor unit
branch kit
9 ft (3 m) or less a, b
• Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
164 ft (50 m) or less
H1
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
131 ft (40 m) or less
Between indoor units 49 ft (15 m) or less H2, H3
Between outdoor units 1 ft (0.5 m) or less H4
Between RB unit and indoor unit 16 ft (5 m) or less H5
Between RB units 49 ft (15 m) or less H6
• Total refrigerant amount : 154.32 lbs (70.0 kg) or less
• Outdoor unit capacity : Master ≥ Slave
C) In the case of 3 outdoor units connected
Fig. C
O.U.-3
(Slave2)
O.U.-2
(Slave1)
O.U.-1
(Master)
f
e
c
b
a
H4
d
p
H1
H2
H3
H6
H5
*1
(*1:Cooling only)
RB
RB RB RB RB
RB RB
RB
I.U.
I.U. I.U. I.U.
I.U.
I.U. I.U. I.U. I.U.
O.U. :Outdoor unit
RB :RB unit
I.U. :Indoor unit
• Allowable pipe length (actual pipe length)
Between master outdoor unit and the
farthest indoor unit
541 ft (165 m) or less
a+e+f
a+e+p
Between the fi rst separation tube and the
farthest indoor unit
196 ft (60 m) or less f, p
Total pipe length 3280 ft (1000 m) or less Total
Between outdoor unit and outdoor unit
branch kit
9 ft (3 m) or less a, b, c
Between the farthest outdoor unit and the
fi rst outdoor unit branch kit
39 ft (12 m) or less
b+d
c+d
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