Design and Technical Manual

6. SYSTEM DESIGN
EXAMPLE 2

21 3 54 6
a
d
f g h i j k
c
Outdoor unit
Separation
tube
Branch box Branch box
Indoor unit Indoor unitIndoor unit Indoor unitIndoor unit Indoor unit
(18000Btu) (9000Btu)(7000Btu) (7000Btu)(7000Btu) (7000Btu)
System conguration
z
(Indoor units)
1 2 3 4 5 6 7 8
Total Capacity
(Btu)
Model name ASU18 ASU7 ASU7 ASU9 ASU7 ASU7
55000
Capacity (Btu) 18000 7000 7000 9000 7000 7000
Capacity ratio
z
(Total indoor unit capacity) / (Total outdoor unit capacity)
= (55000) / (48000) = 114.6% (Within 80% to 130%)
Selection of separation tube
z
Model Q'ty
UTP-SX248A 1
Selection of branch box
z
Model Q'ty
UTP-PU03A (primary) 1
UTP-PU03B (secondary) 1
Selection of pipe size
z
a b c d e f g
Liquid pipe size
in. (mm)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
1/4
(6.35)
1/4
(6.35)
Gas pipe size
in. (mm)
5/8
(15.88)
5/8
(15.88)
5/8
(15.88)
1/2
(12.70)
3/8
(9.52)
Pipe length
ft (m)
23
(7)
82
(25)
33
(10)
16
(5)
16
(5)
h i j k l m
Liquid pipe size
in. (mm)
1/4
(6.35)
1/4
(6.35)
1/4
(6.35)
1/4
(6.35)
Gas pipe size
in. (mm)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
Pipe length
ft (m)
16
(5)
16
(5)
16
(5)
16
(5)
- (06 - 20) -
SYSTEM DESIGN SYSTEM DESIGN