Refrigerant Piping Work; Piping Materials - Hitachi RPIZ-0.8HNATNQ Operation Installation Maintenance Manual

(2) Install 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
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 locker to
prevent the nut getting loose.
CAUTION
Please cover the machine with plastic cloth during
installation so as to keep it clean.
Suspension Bolt
Support Leg
Indoor Unit
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〉
Plenum Chamber
Canvas Air Duct
Thermal Insulation Material
Volume Damper
(for Fine Adjustment)
Air Outlet
Level
Service Access
(600mmx600mm)
Fig. 4.8 Air Duct Connection
5. Refrigeration Piping
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-tight test. These
gases are extremely dangerous and can cause an
explosion. It is recommended nitrogen be used for those
tests.

5.1 Piping Materials

(1) Prepare locally-supplied copper pipes.
(2) Select clean copper pipes. Make sure there is no
dust and moisture inside. Blow the inside of the
pipes with nitrogen or dry air, to remove any dust
or foreign matters before connecting pipes.
(3) Select copper pipes based on Fig. 5.2.
4
Plenum Chamber
Canvas Air Duct
Volume Damper
Outside Air
(Outside Air that
Passes Filter
Return Air Inlet
(with Filter Screen)
DANGER
Screen)