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.

Bad example

Bad example

Good example

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:

 

A

Air conditioner

B

 

A

Static pressure box Equipped with

A

 

 

air filter (bought)

Air volume Duct(mmxmm)

A

2400m3/h

250x560

 

 

 

B

2000m3/h

250x470

The calculation of duct resistance (the simple calculation is as follow table)

Straight part

Calculate as per 1m length 1Pa, 1Pa/m

 

 

Bend part

Each bend takes as a3~4m long straight duct

 

 

Air out part

Calculate as 25Pa

 

 

Static pressure box

Calculate as 50Pa/each

 

 

Air inlet grille (with air filter)

Calculate as 40Pa/each

The chosen chart of simple duct

Note:1Pa/m=0.1mmAg/m

 

 

 

Shape

Square duct

Item

Dimension

Air volume

 

 

 

m3/h(m3/n)

(mmxmm)

100

250

x

60

200

250

x

90

300

250

x

120

400

250

x

140

500

250

x

170

600(10)

250

x

190

800

250

x

230

1,000

250

x

270

1,200(20)

250

x

310

1,400

250

x

350

1,600

250

x

390

Shape

Square duct

Item

Dimension

Air volume

 

 

 

m3/h(m3/n)

(mmxmm)

1,800(30)

250

x

430

250

x

470

2000

2400

250

x

560

3,000(50)

250

x

650

3,500

250

x

740

4,000

250

x

830

4,500

250

x

920

5,000

250

x

1000

5,500

250

x

1090

6,000(100)

250

x

1180

28

Page 29
Image 29
Haier HDU-42HT03/H Chosen chart of simple duct, Each bend takes as a3~4m long straight duct, Square duct, Hm 3/n Mmxmm

HDU-42HT03/H specifications

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