User Manual

UNITS INSTALLATION
10-37
Material of the Wall, Frame
Flammable
Non-flammable
A
Min 100cm
Min 10cm
B
Min 60cm
Min 5cm
f) If decided to keep the flange at discharge side, fix
screw ② at 8 positions. However, if decided not to
keep the flange, remove 4 screws that fixed to the
flange.
Fix in factory
g) Adjusting of the Unit Level
i) Check to ensure that the foundation is flat,
taking into account the maximum foundation
gradient. If not, it will cause malfunction of
float switch or no operation. Subsequently,
drain water will drop from ceiling
ii) The unit should be installed so that the rear
side of the unit is slightly (0mm to 5mm) lower
than the fronts side, in order to prevent
incorrect positioning of the drain discharge.
iii) Tighten the bolts of the sling nuts with the
suspension brackets after adjustment is
completed. Special plastic paint must be
applied to the bolts in order to prevent them
from loosening. Keep the unit as well as
relevant equipment covered with vinyl
h) Connecting Return Duct and Supply Duct
i) The return duct should be connected with the
indoor through canvas ducts between inlet
side of the indoor unit and ceiling of the room.
The supply duct should be connected with the
indoor unit through canvas ducts. In order to
avoid abnormal sound vibration. The unit is
equipped with a pre-drilled duct flange for the
return and supply duct connection.
ii) Attach the vibration proof rubber to Sling bolt
in order to avoid abnormal sound vibration.
iii) Natural frequency is 9 to 21Hz
iv) Duct material should be non-inflammable
material.
v) Perform the heat insulation work over the
duct and the duct flange for dew protection.
 CAUTION
• If a lower sound level is further required, install
silencer (field-supplied)
• The facility design should be “Unit External Static
Pressure = Duct Pressure Loss Suction / Discharge
Loss”. If the duct pressure loss becomes under to
the unit external static pressure, air speed will get
larger and lead to the occurrence of loud noise,
splashing water and the trigger of motor protection
mechanism. If the unit external static pressure
becomes under to the duct pressure loss, some
problems such as inability to change the air speed
may occur. Set the air flow control damper or shift
the static pressure control switch to adjust to get
almost equal level between the external static
pressure and the duct pressure loss. (See “Setting
of External Pressure” section for the details)
• Basically this unit is designed to install the ducts on
the inlet side and the outlet side. Ask for more
information for using the return ducts in the ceiling.
• Select the indoor unit position, fixing direction of air
outlet so that cool/hot air reaches all the room.
Standard position of the indoor unit is with the wall
side on the ceiling.
• Remove the factory fitted filter and filter holders
before installing of full duct type.
Unit
5mm
Air filter
Air filter
removing
direction
B
A
Outdoor Air
(with Air Filter)
Damper for
adjusting air volume
Silencer
Air Inlet
Canvas Duct
Canvas Duct
Service Access panel
(450mmx450mm)
Horizontal
Air Outlet
Silencer
Thermal insulation
Damper for fine
adjusting air volume