Hitachi RPIH-4.0FSRE Manual De Instalación Y Funcionamiento página 36

INDOOR UNITS INSTALLATION
4.3.2 Duct & suction air filter installation
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Field Supply Duct installation
Fix the Flexible Air Duct to External Faces of unit flanges (the
unit is equipped with factory supply flanges for this purpose).
It is recommended to use a Flexible field supply Duct portion in
order to avoid any abnormal sound vibration.
Insulate frame corners by using properly tape. Field supplied.
RPIH units are equiped with standard Air Filter at the suction
side. This filter is provided for the cases in which no Suction
Duct is applied (or it is very short).
It is recommended the following indications depending on the
installation.
• Keep the standard Air Filter in case of no Suction Duct is
applied (fig. 1).
• In case of applying Suction Duct, it is recommended to apply
Air Filter at the inlet point of Suction Duct, removing the
standard Air Filter of the unit (fig. 2).
Fig. 1
Std. Air filter
(Factory supplied)
Fig. 2
Air filter (Field supplied or
adapted factory supplied)
6 PMML0529 rev.1 - 02/2021
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Suction Air Filter Servicing
There are two options for filter extraction, depending on the
location of the unit:
• Lower extraction:
a. Turn 90° the fixing screw and remove the lower Air Filter
support from the unit.
b. Pull down the Air Filter.
Air flow
• Lateral extraction:
a. Turn 90° the fixing screw and remove the lateral Air Filter
support from the unit.
b. Pull the Air Filter and fold it over the joint as much as you
need for the extraction.
180° in any
direction
Air flow
Air filter support
Fixing screw
Fixing screw
Air filter
Air Filter
Air Filter
Support