Hitachi RPIH-3.0HNAUB1Q, Operation Installation Maintenance Manual, Page: 16 / 24

10
(2) Installation of Indoor Unit
Place the left bracket on the nut and washer of
suspension bolt as shown in the figure below.
Make sure the left bracket is properly placed
on the nut and washer, and put the right
bracket of indoor unit on the nut and washer.
(The suspension bolt can be slightly shifted
for the placement of indoor unit.)
Support Leg
Nut and Washer
Suspension Bolt
Support Leg
Indoor Unit
Fig. 4.6 Handling Method
4.3.4 Leveling of Indoor Unit
(1) Check to ensure the top surface is level, and
measure the max. top surface inclination degree.
Fig. 4.7 Top Surface Inclination Degree
(2) As shown in Fig. 4.7, the rear part of indoor unit is
slightly lower than its front part (by 0~5mm) so as to
facilitate drainage.
(3) Tighten the suspension nut upon completion of
adjustment. It's essential to apply thread locking
agent to avoid nut looseness.
Please cover the machine with plastic cloth during
installation so as to keep it clean.
4.3.5 Air Duct Connection
Air duct is connected to indoor unit via canvas hose
to effectively isolate noise and vibration. Indoor unit
is designed with flange with hole connectible to air
duct.
<Example>
Canvas Air Duct Canvas Air Duct Plenum Chamber
Volume Damper
Plenum Chamber
Outside Air
Service Access
Return Air Inlet
(For Fine Adjustment)
Air Outlet
Level
Thermal Insulation Material
Volume Damper
Outside Air that Passes Filter
Screen
(With Filter Screen)
Schedule of External Static Pressure
Factory default
Fig. 4.8 Air Duct Connection
(3) Select copper pipes based on Fig. 5.2.
External Static Pressure(Pa)
RPIH-3.0~6.0HNAUB1Q
RPIM-0.8~2.5HNAUB1Q
120(*)/90
50(*)/80
Model
Use refrigerant R410A in the refrigerant cycle. Do
not charge oxygen, acetylene or other flammable
and poisonous gases into the refrigerant cycle
when performing a leakage test or an air-tightness
test. These gases are extremely dangerous and
can cause an explosion. It is recommended
nitrogen be used for those tests.