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3
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 fi nish worker for more information on this.
(a) To maintain the appropriate levelness of the ceiling and preventing the vibration, the additional reinforcement in the ground
of ceiling (Building Frame) is essential.
Also, rubber cushion can be applied for the insuffi cient 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 fl icker or the light unit may be rattled by the vibration of the indoor units.
Mounting the indoor unit
Hanging indoor unit.
Field-Supplied Parts
*Sling Bolts
*Nut
Sling Bolts (4-M10 or W3/8)
(Field-Supplied)
Unit
Suspension
Bracket
False Ceiling Side
1. How to put Nuts or Sling Bolts
Put nuts on each of the four hanging bolts.
1
Washer
1
Washer
Nut
2. Hanging the Indoor unit
Hook suspension bracket to the nut and washer of each hanging bolt, as shown, starting at the opposite side to service
cover side.
After checking that the nut and washer are correctly fi xed 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.)
Piping and wiring work will be required in the ceiling after hanging the unit. Therefore, determine the drawing direction of
the pipe after selecting the installation location, particularly if the ceiling has existing piping. Wiring work should be carried
out up to the connecting positions before hanging the unit.
Suspension
Bracket
Nut &
Washer
Left Side
3. For reasons of disaster prevention, the distance between under the roof and the wall surface should be followed as shown
in the fi gure below.
Use the nonfl ammable material for the duct.
Material of the Wall, Frame
Flammable
A
Min. 100cm
B
Min. 60cm
4. If decided to keep the fl ange at discharge side, fi x screw 2 at 8 positions. However, if decided not to keep the fl ange,
remove 4 screws that fi xed to the fl ange.
Fix in factory
Adjusting of the Unit Level
1. Check to ensure that the foundation is fl at, taking into account the maximum foundation gradient.
If not, it will occur malfunction of fl oat 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 fl ange 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-fl ammable material.
5. Perform the heat insulation work over the duct and the duct fl ange for dew protection.
4-M10 or W3/8
8-M10 or W3/8
Nut & Washer
(4-M10 or W3/8)
Nut (Field-Supplied)
Washer (Accessory)
Retaining Nut
Indoor Unit
Sling Bolt
Suspension Bracket
Right Side
(Service Cover Side)
Unit
Nonfl ammable
Min. 10cm
Min. 5cm
If a lower sound level is still required, install a silencer (fi eld-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
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 airfl ow
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.
Silencer
Canvas Duct
Thermal Insulation
Damper for Fine
Adjusting Air Volume
Air Outlet
Horizontal
Select the indoor unit position, fi xing the direction of air outlet so that the cool/hot air reaches all around the room. The standard
position of the indoor unit is with the wall side on the ceiling.
Remove the factory fi tted fi lter and fi lter holders before installing of full duct type.
Air Filter
removing
direction
Inlet air direction change instructions
Inlet Air direction
(factory supplied)
Back Cover
4
Connection of drain pipe
(1) Securely glue connection part of drain hose and PVC pipe, using PVC adhesive.
CAUTION
!
If the glue between the drain hose and PVC pipe is too weak, water leakage may occur.
(2) Be sure to wrap generally-available insulator (10mm or more of foamed polyethylene) around drain hose, inside the house,
for insulation heat.
(3) Checking drain and water leakage.
Perform after connecting power.
Add water to water pan of indoor unit.
(4)
Test run method can be done by using HHRC and WRC. Detail shall refer to service manual page "Service setting mode".
(5) Perform a test run of the drain pump to check drainage operation.
CAUTION
!
If checking of drainage is omitted, water loss may occur.
If drain pump test run is left set to TEST RUN, drain pump may malfunction.
!
CAUTION
Canvas Duct
Silencer
Damper for Adjusting
Air Volume
Outdoor Air
(with Air Filter)
Air Inlet
Service Access Panel
(450mm x 450mm)
Air Filter
Optional Inlet Air direction
(by changing the Back Cover)
Change Back Cover side
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