Fujitsu AOUA72ULBV5 - SYSTEM CONFIGURATION (for Heat Recovery System)

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5. SYSTEM CONFIGURATION (for Heat Recovery
system)
About for Heat Pump system, refer to “4. SYSTEM CONFIGURATION (for Heat Pump
system)”.
For detailed information, refer to the Design & Technical manual.
5.1. System configuration (for Heat Recovery system)
CAUTION
• 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.
5.1.1 In case of 1 outdoor unit connected
Outdoor unit
RB unit
Indoor unit
(Cooling only)
(Primary)
Allowable pipe length (actual pipe length)
Between primary outdoor unit and the farthest
indoor unit
541 ft (165 m) or less
a + f
a + p
Between the first separation tube and the
farthest indoor unit
295 ft (90 m) or less
f, p
(Farthest indoor unit) - (Closest indoor unit) 196 ft (60 m) or less
f(p) - g(q)
Total pipe length 2,296 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
5.1.2 In case of 2 outdoor units connected
Outdoor unit
RB unit
Indoor unit
(Cooling only)
(Primary)
(Subordinate)
Allowable pipe length (actual pipe length)
Between primary outdoor unit and the farthest
indoor unit
541 ft (165 m) or less
a + e + f
a + e + p
Between the first separation tube and the
farthest indoor unit
196 ft (60 m) or less
f, p
(Farthest indoor unit) - (Closest indoor unit) 196 ft (60 m) or less
f(p) - g(q)
Total pipe length
3,280 ft (1,000 mm) 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
• Outdoor unit capacity: Primary ≥ Subordinate
5.1.3 In the case of 3 outdoor units connected
Outdoor unit
RB unit
Indoor unit
(Cooling only)
(Primary)
(Subordinate 1)
(Subordinate 2)
Allowable pipe length (actual pipe length)
Between primary outdoor unit and the
farthest indoor unit
541 ft (165 m) or less
a + e + f
a + e + p
Between the first separation tube and the
farthest indoor unit
295 ft (90 m) or less
f, p
(Farthest indoor unit) - (Closest indoor unit) 196 ft (60 m) or less
f(p) - g(q)
Total pipe length
3,280 ft (1,000 mm) 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 first
outdoor unit branch kit
39 ft (12 m) or less
b + d
c + d
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
• Outdoor unit capacity: Primary ≥ Subordinate 1 ≥ Subordinate 2
NOTE:
• If the outdoor temperature during cooling operation is expected to be 23°F (–5°C) or
less, outdoor unit must be installed lower than 16 ft (5 m) or less from the indoor unit.
• Please refer to “9.3.2 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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