Air Duct Connection - Hitachi RCI Service Manual

2 Unit installation
Check that the condensate discharge system in the indoor unit
works correctly. To do so, check the level of the drain pan using a
spirit level or a clear flexible pipe full of water. The side of the unit
on which the drain hose is located must be around 5 mm lower than
the front side.
N O T E
The drainage connection on the RPIM unit is located at the rear.
Once adjusted, tighten the suspension bracket nuts.
Apply a thread-locking product to the bolts and nuts to prevent them from loosening. Otherwise, abnormal noise may be
caused by mechanical vibrations and the indoor unit may become loose.
Apply protective paint to the bolts and nuts to prevent rusting.
Secure the drain hose with the clamp and adhesive supplied.
C A U T I O N
Completely cover the unit with a sheet of plastic to protect it during installation work.

2.5.3 Air duct connection

N O T E
• Use field-supplied flexible ducts to avoid abnormal acoustic vibrations.
• RPI units are supplied with a standard air filter on the suction side. This filter is supplied for cases where no
suction duct is applied (or when the duct is very short).
Secure the flexible air duct to the outsides of the hoses supplied with the unit.
Bear in mind the following instructions depending on the installation type:
1 Where the suction duct is not used, keep the standard air filter.
2 Where the suction duct is used, fit the air filter at the suction duct inlet point, removing the standard air filter from the
unit. This air filter must be field-supplied or a factory-adapted one must be used.
3 In the case of the RPIM unit, low static pressure is produced in the suction duct and, therefore, a short duct must be
used.
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SMGB0063 rev. 1 - 10/2010
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