Design and Technical Manual

6. SYSTEM DESIGN
EXAMPLE 4

1 2 3
a b
d
f i l
e
c
Outdoor unit
Separation
tube
Branch box Branch box Branch box
Separation
tube
Indoor unit Indoor unit Indoor unit
(18000Btu) (18000Btu) (24000Btu)
System conguration
z
(Indoor units)
1 2 3 4 5 6 7 8
Total Capacity
(Btu)
Model name ASU18 ASU18 ASU24
60000
Capacity (Btu) 18000 18000 24000
Capacity ratio
z
(Total indoor unit capacity) / (Total outdoor unit capacity)
= (60000) / (48000) = 125.0% (Within 80% to 130%)
Selection of separation tube
z
Model Q'ty
UTP-SX248A 2
Selection of branch box
z
Model Q'ty
UTP-PU03A (primary) 1
UTP-PU03B (secondary) 2
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)
3/8
(9.52)
3/8
(9.52)
1/4
(6.35)
Gas pipe size
in. (mm)
5/8
(15.88)
5/8
(15.88)
5/8
(15.88)
5/8
(15.88)
5/8
(15.88)
1/2
(12.70)
Pipe length
ft (m)
23
(7)
59
(18)
59
(18)
16
(5)
16
(5)
39
(12)
h i j k l m
Liquid pipe size
in. (mm)
1/4
(6.35)
1/4
(6.35)
Gas pipe size
in. (mm)
1/2
(12.70)
5/8
(15.88)
Pipe length
ft (m)
39
(12)
39
(12)
- (06 - 24) -
SYSTEM DESIGN SYSTEM DESIGN