Haier AU282AHBEA Service Manual page 169

muffler cavity (air sending)
Insulation
Air outlet
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
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
Shape
Item
Air volume
3 3
m /h(m /n)
100
200
300
400
500
600(10)
800
1,000
1,200(20)
1,400
1,600
Sacking joint
A
Air conditioner
main unit
Checking meatus
Bad example
Air conditioner
A
A
Equipped with
Static pressure box
air filter (bought)
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
Square duct
Dimension
(mmxmm)
250 x 60
250 x 90
250 x 120
250 x 140
250 x 170
250 x 190
250 x 230
250 x 270
250 x 310
250 x 350
250 x 390
>a__WcU[S^ <[c >a`V[e[a`Wc
Air volume adjuster
Ceiling
Air suction grille with air filter
Good example
Air volume Duct(mmxmm)
2400m 3 /h
250x560
A
(40m 3 /min)
3
600m /h
250x190
B
3
(10m /min)
Shape
Square duct
Item
Dimension
Air volume
3 3 (mmxmm)
m /h(m /n)
250 x
1,800(30)
250 x
2000
250 x
2400
250 x
3,000(50)
250 x
3,500
250 x
4,000
250 x
4,500
250 x 1000
5,000
250 x 1090
5,500
250 x 1180
6,000(100)
-169-
Enlarging chart of
profile chart A
Vibration resistance hook
Air volume Duct(mmxmm)
1200m 3 /h
250x310
(20m 3 /min)
300m 3 /h
250x120
(5m 3 /min)
430
470
560
650
740
830
920