Airwell YCV280, Installation And Maintenance Instructions Manual

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(4) Installation of air return duct
The unit is with air return and is set as back return type when out of factory. When installation, it can be
changed to down return type.
Ceiling Concealed type indoor unit must be with air return duct when installation, as figure 3 and 4:
Ceiling
Air supply
Air return
A
Building roof
Air return box
0.5m or 5m
Air supply duct
Unit
Fig. 3
no obstacles
within 1m
Air outlet
grille
Fig. 4(for A)
Air supply
Unit
Air return
Air return box
Every air sending duct and air return duct shall be fixed on the ceiling prefabricated panel by the iron
bracket. The duct joint is sealed with the glue. The recommended distance between the edge of the air
return duct and the wall is over 150mm.
The distance from the air outlet of the duct to the air outlet of the air conditioner is decided by the
length of duct and static pressure terminal:
Installation of short and long ducts is as below figure, when connecting the short ducts, use the low
static pressure terminals, which is white, the distance from the air outlet of the duct to the air outlet of
the air conditioner shall be no more than 0.5 m; When connecting the long ducts, use the middle static
pressure terminals, which is red. The distance from the air outlet of the duct to the air outlet of the air
conditioner shall be no more than 5m.
Fan speed selection (when using high efficient filter)
The fan motor composes red terminal and white terminal, which has been set at standard position when
out of factory. When the static pressure is increased for using high efficient filter, you can change the
connector position on the side of electric control box.
Standard Style(set in Factory)
Yellow
Black
Blue
Red
Yellow
Orange
Black
Blue
Control Box
Fan motor terminal
Control Box
Yellow
Black
Red
Blue
Yellow
Black
Red
Blue
High Speed Style
Static pressure range Unit: Pa
Standard static pressure
Max. static pressure
0 20
Fan motor terminal
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