9
Multi Variable Air Conditioners Ducted Type Indoor Unit
1
2
5
4
4
6
1
5 3
Air supply
Air supply
Return air
Return air
Install the return air pipe (a)
Install the return air pipe (b)
Fig.8 Installation of the back air pipe
No. Name No. Name
1 Return air vent (with lter) 4 Indoor unit
2 Canvas air pipe 5 Air supply pipe
3 Return air pipe 6 Test grill
3.10 Installation the fresh air pipe
A. When the fresh air pipe is needed to be connected, cut the fresh air bafe as shown in g.9. Plug up the
gap of the fresh air bafe by sponge if the fresh air pipe is not be used.
B. Install the round ange so that the fresh air pipe can be connected as g.10.
Cut off
Cut off
Fresh air baffle
Round air pipe
Fig.9 Fig.10
C. Sealing and heat preservation should be done for both the air pipe and round ange pipe.
D. Fresh air should be treated via the air lter.
Attention:
★
There should be thermal insulation layers around the supply air and air return ducts as well as on the
fresh air ducts to protect against heat losses and condensation. Adhere the plastic nails onto the ducts, and then
attach a layer of insulation cloth with the tinfoil onto the ducts. Fix the plastic nail and then seal tightly the
joints by way of tinfoil tapes. Some other materials with good thermal insulation properties can also be used.
★
The air supply and air return ducts should be xed to the prefabricated ceiling boards with iron stands.
The joints of the air ducts should be sealed tightly to prevent from air leakage.
★
The designing and operation of the air ducts should comply with the related state standards and
procedures for engineering.
★
It is recommended to leave at least a space of 150mm between the edges of the air return duct and the
wall, and a lter screen should be placed at the air return opening.
★
Mufing and vibration reduction should be taken into consideration during the designing and operation
of the air ducts. In addition, the noise source should be kept away from the crowds. It is absolutely not allowed
to design the placement of the air return opening right over the head of the users (in the ofces, lounges or
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