Design and Technical Manual

6. SYSTEM DESIGN
EXAMPLE 3

21 3
f g h
c
Outdoor unit
Branch box
Indoor unit Indoor unit Indoor unit
(24000Btu) (18000Btu) (7000Btu)
System conguration
z
(Indoor units)
1 2 3 4 5 6 7 8
Total Capacity
(Btu)
Model name ASU24 ASU18 ASU7
49000
Capacity (Btu) 24000 18000 7000
Capacity ratio
z
(Total indoor unit capacity) / (Total outdoor unit capacity)
= (49000) / (48000) = 102.1% (Within 80% to 130%)
Selection of separation tube
z
Model Q'ty
UTP-SX248A None
Selection of branch box
z
Model Q'ty
UTP-PU03A (primary) 1
UTP-PU03B (secondary) None
Selection of pipe size
z
a b c d e f g
Liquid pipe size
in. (mm)
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)
1/2
(12.70)
Pipe length
ft (m)
148
(45)
39
(12)
39
(12)
h i j k l m
Liquid pipe size
in. (mm)
1/4
(6.35)
Gas pipe size
in. (mm)
3/8
(9.52)
Pipe length
ft (m)
49
(15)
- (06 - 22) -
SYSTEM DESIGN SYSTEM DESIGN