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INSTALLATION MANUAL FOR INDOOR UNIT
The length difference among every duct is limited below 2:1.
Reduce the length of duct as possible as can.
Reduce the amount of bend as possible as can.
Use heat insulation material to bind and seal the part connecting main unit and the flare part of air
discharging duct. Perform duct installation work, before the fitment of ceiling.
7. Calculation method of the dimension of the simple quadrate air duct
Presuming the unit length friction impedance of the duct is 1Pa/m, when the dimension of one side of
the air duct is fixed as 250mm, as shown below:
B
A
The calculation of duct resistance (the simple calculation is as follow table)
Straight part
Bend part
Air out part
Static pressure box
Air inlet grille (with air filter)
The chosen chart of simple duct
Note:1Pa/m=0.1mmAg/m
Air volume
3
3
m
/h(m
100
200
300
400
500
600(10)
800
1,000
1,200(20)
1,400
1,600
Bad example
Air conditioner
A
Static pressure box
Calculate as per 1m length 1Pa, 1Pa/m
Each bend takes as a3~4m long straight duct
Calculate as 25Pa
Calculate as 50Pa/each
Calculate as 40Pa/each
Shape
Square duct
Item
Dimension
/n)
(mmxmm)
250
x
250
x
250
x
250
x
250
x
250
x
250
x
250
x
250
x
250
x
250
x
Bad example
Air volume
2400m
A
(40m
600m
B
(10m
A
Equipped with
air filter (bought)
Air volume
3
m
/h(m
60
1,800(30)
90
2000
120
2400
140
3,000(50)
170
3,500
190
4,000
230
4,500
270
5,000
310
5,500
350
6,000(100)
390
27
Good example
Duct(mmxmm)
Air volume
1200m
/h
3
3
/h
250x560
(20m
3
/min)
/min)
3
300m
/h
3
/h
3
250x190
(5m
/min)
3
/min)
3
AD42NAHAAA
AD242AHAAA
AU42NAQAAA
AU242AOAAA
(HDU-42H03/H)
(HDU-24H03/H)
Shape
Square duct
Item
Dimension
3
(mmxmm)
/n)
250
x
250
x
250
x
250
x
250
x
250
x
250
x
920
250
x
1000
250
x
1090
250
x
1180
Duct(mmxmm)
250x310
250x120
430
470
560
650
740
830
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