11
Step 4: Horizontality check
After the installation of the indoor unit, its horizontality must be checked to make sure the unit keep hori-
zontal fore and aft and keep an inclination of 5° toward the drain pipe right and left, as shown below.
Horizontaly check device
INSTALLATION OF AIR SUPPLY DUCT
A) Rectangular air supply duct
4
6
8
3
7
5
1
2
3
Return air
Return air
Supply air
No.
Name
1
Hanger
2
Return Air Duct
3
Canvas Duct
4
Return Air Inlet
5
Plenum Box
6
Filter Screen
7
Main Air Supply Duct
8
Air Supply Outlet
B) Round air supply duct
No.
Name
1
Return Air Duct
2
Canvas Duct
3
Return Air Louver
4
Hanger
5
Air Supply Outlet
6
Transition Duct
7
Air Supply Duct
8
Diffuser
9
Diffuser Joint
1
2
4
3
5
6
7
8
9
• Preinstall the outlet of the round duct on the transition duct and then fix it with the tapping screw.
• Place the transition duct to the air outlet of the unit and fix it with rivets.
• Connect the outlet to the duct and then tighten them with tape. Other installation details are not
covered herein.
CAUTION
• The maximum length of the duct means the maximum length of the air supply duct plus the maximum
length of the return air duct.
