Initial Check - Hitachi RAI-50PPD Installations- Und Betriebshandbuch

INDOOR UNIT INSTALLATION

8.2 INITIAL CHECK

• Install the indoor unit with a proper clearance around it
paying careful attention of installation direction for the piping,
wiring and maintenance working space, as shown below.
• The electrical box is located to the side surface of the unit
body. When installing the indoor unit, set up a service
access door at the electrical box side for servicing. For
servicing of the electrical box, make sure not to install the
refrigerant and drain piping in front of the electrical box.
• When equipping the duct adapter (optional), setup a service
access door at the duct adapter side in order to install the
duct adapter. Refer to the installation manual of the duct
adapter for details.
Distance from wall side
Access door for duct adapter (optional)
Min. Min. Min.
1500 1500 1500
Service access door
Electrical box
Piping connection Piping connection
Minimum service space
Piping connection side
Electrical box side
Min. 500 Min. 100
Min. 100
Min. 1000
• Check space between ceiling and false ceiling is enough as
indicated below.
• The drain piping shall be installed on a downward slope
of 1/25 to 1/100 as shown in the figure below. Refer to the
Chapter "10 Drain piping"
• Check that the ceiling surface is flat and suitable for the air
panel installation. If the ceiling is not flat, drain water could
not flow smoothly.
?
N O T E
In the case installing the indoor unit to a grid ceiling, do not touch the unit
body, the electrical wiring and refrigerant piping to a suspension bolt of a
grid. Check the location of suspension bolts of a grid ceiling and indoor
unit mounting position before installing of the indoor unit.
9 PMML0477 rev.0 - 07/2017
Access door for duct adapter (optional)
Min. Min.
3000 1500
Service access door Service access door
Electrical box Electrical box
Piping connection
Min.
2400
Min. 500
Clearance:
Min. 30 mm
285mm
Unit height in
false ceiling
for details.
Drain piping
Downward slope:
1/25 to 1/100
Grid ceiling
Grid Ceiling
• Select a suitable installation location, considering the air
distribution from each indoor unit to the whole room so that
room temperature will be uniform.
• Install the unit where there is no obstacles which may
hamper the suction air and discharged air.
• Do not install the unit near a door or a window where the
indoor unit may contact humid outside air. Otherwise, dew
condensation may occur.
• In case temperature and humidity inside the ceiling exceeds
30ºC/RH (Relative Humidity) 80%, apply additional insulation
materials to the external surface of the indoor unit to avoid
dew condensation.
• If installing the indoor unit to a high ceiling, the warmed air
may stay around the ceiling during heating operation. Thus,
the parallel installing of a circulator is recommended.
• Do not install the indoor unit where the airflow from the air
outlet blows directly to the temperature detecting devices
such an alarm device or a control device. It may cause a
failure of an alarm device or a control device.
• Multiple Combinations. For simultaneous operation of
multiple units, the units must be installed in the same room
and be operated under the same conditions. If the room is
partitioned by a wall, furniture or a curtain, etc., it may cause
an operation failure. Take care when rearranging furniture or
remodelling the room after installation as well.
• When installing the receiver kit (optional) or the motion
sensor (optional), refer to their respective Installation
manuals.
• "STATIC PRESSURE SW" on the PCB must be set to HIGH
PRESSURE when installing the indoor unit at a height
of more than 2500 mm from the floor. It must be set to
NORMAL when installing the indoor unit at a height of less
than 2500 mm from the floor.
Ceiling height
RAI-(50/60)PPD
≤ 2.5 m
≤ 3.5 m
Suspension bolt for
Suspension Bolt
indoor unit
for Indoor Unit
Suspension bolt
Suspension Bolt for Suspension Bolt for
for grid ceiling
Grid Ceiling Grid Ceiling
STATIC PRESSURE SW
SW504
NORMAL
HIGH