Hitachi RCI Service Manual page 76

2 Unit installation
Check that there is no dust, sawdust or other foreign particles inside
the ducts before connecting them.
C A U T I O N
When connecting the ducts, do not touch the damper plate
located behind the main unit.
Position and secure the ducts in the connection hoses and apply
aluminium tape (field-supplied) around the connection to avoid air
leaks. The duct connection hoses have a previously installed
sealing system.
Suspend the ducts from the ceiling so that the weight does not rest
on the unit.
Cover the two outdoor ducts with suitable heat insulation material
to prevent the formation of condensation.
Secure the flexible air duct to the outsides of the hoses supplied
with the unit.
Do not install ducts along complex layouts or sharp bends. The
volume of air may be reduced, leading to abnormal circulation
noises. Particularly avoid the following situations:
• A: extremely tight bends.
• B: multiple bends.
• C: bends next to the outlet.
• D: extreme reduction of the diameter of the connected ducts.
64
SMGB0063 rev. 1 - 10/2010