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Installation of Indoor Unit
Marking of the Positions of the Sling bolts and Piping Connections
1.Mark the positions of the sling bolts, refrigerant piping connections and drain connection.
2.Ceiling Work: it basically varies according to the building structure.
Consult with the architect or interior finish worker for more information on this.
(a) To maintain the appropriate levelness of the ceiling and preventing from the vibration, the additional reinforcement in the
ground of ceiling (Building Frame) is essential.
Also, rubber cushion can be applied for the insufficient strength of the frame around the sling part on the ceiling.
(b) Provide a space for the air inlet grille, air outlet grille and maintenance work.
(c) Do not suspend the indoor unit and electric light units from the same auxiliary supporting beams, and do not connect the
suspension bolts on the indoor units. If connected, the light may flicker or the light unit may be rattled by vibration of the indoor
units.
Mounting the indoor unit
Hanging indoor unit.
1.How to put Nuts or Sling Bolts
Put nuts on each of the four hanging bolts.
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2.Hanging the Indoor unit
Hook suspension bracket to the nut and washer of each hanging bolt, as shown, starting
G
at the opposite side to service cover side.
G
After checking that the nut and washer are correctly fixed by the retainers of the suspension bracket, hook the suspension bracket
of the service cover side to the nut and washer. (Put the sling bolts away from the unit when hooking.)
G
Piping and wiring work will be required in the ceiling after hanging the unit. Therefore, determine the drawing direction of pipe after
selecting the installation location, particularly if the ceiling was existed.
piping and wiring work should be carried out up to the connecting positions before hanging the unit.
3.For reasons of the disaster prevention, the distance between under the roof and wall surface should be followed as shown in the
below figure.
G
Use the nonflammable material for the duct.
4.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.
Adjusting of the Unit Level
1.Check to ensure that the foundation is flat, taking into account the maximum foundation gradient.
If not, it will occur malfunction of float switch or not operation. Then it will drop the drain water from the ceiling.
2.The unit should be installed so that the rear side of the unit is slightly (0mm to 5mm) lower than the front side, in order to avoid
the incorrect position of the drain discharge.
3.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 the vinyl cover during installation work.
Connecting Return Duct and Supply Duct
1.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.
2.Attach the vibration proof rubber to Sling Bolt in order to avoid abnormal sound vibration.
3.Undamped natural frequency is 9 to 21 Hz.
4.Duct material should be non-flammable material.
5.Perform the heat insulation work over the duct and the duct flange for dew protection.
Fix in factory
G
If a lower sound level is further required, install silencer (field-supplied).
G
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 louder
noise, splashing water and activation of motor protection circuit, and 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 airflow 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.)
G
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.
G
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.
G
Remove the factory fitted filter and filter holders before installing of full duct type.
Inlet air direction change instructions
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Connection of drain pipe
CAUTION
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