English 5CAUTION• Install the indoor and outdoor units, power supply wiring andconnecting wires at least 3.3 ft away from televisions or radiosin order to prevent image interference or noise.(Depending on the radio waves, a distance of 3.3 ft may notbe sufficient enough to eliminate the noise.)• In the case of the installation of a wireless remote controller, thetransmission distance of the wireless remote controller may beshortened if the room has a fluorescent light of electronic light-ing type (i.e., an inverter or rapid-start fluorescent light).Keep the distance between the receiver and the fluorescentlight as far as possible.(2) Use suspension bolts to install the indoor unit. Check thatthe place of installation withstands the weight of the indoorunit. Secure the suspension bolts with proper beams if nec-essary.4. PREPARATIONS BEFORE INSTALLATION(1) Check the positional relationship between the ceiling open-ing hole and the suspension bolt of the unit.• For the maintenance, inspection, and other servicingpurposes of the control box and drain pump, prepare oneof the following service spaces.1. Inspection hatch 1 (17-3/4 × 17-3/4) for the controlbox and a minimum space of 12 in. for the lower partof the product. (Refer to Fig. 2-2)2. Inspection hatch 1 (17-3/4 × 17-3/4) for the controlbox and inspection hatch 2 for the lower part of theproduct (see arrow view A-1). (Refer to Fig. 2-3)3. Inspection hatch 3 for the lower part of the productand the lower part of the control box (see arrow viewA-2). (Refer to Fig. 2-3)(length: in.)CeilingFloor surface• The H1 dimension indicates theheight of the product.• Determine the H2 dimension bymaintaining a downward slope ofat least 1/100 as specified in“7. DRAIN PIPING WORK”. Min. 1Min. 12Min. 18Min. 99Min. 28 (service space)(If no ceiling board is provided.)*H1=12*H2=Min. 25[Required installation place]The dimensions indicate theminimum required space ofinstallation.Fig. 2-12824-13/16(Suspension bolt pitch)Inspection hatch 1(17-3/4×17-3/4)Inspection hatchControl boxControl boxCeilingBC(Suspension bolt pitch)Bottom of unitAir inletAir outletSuspension bolt (× 4)*H3=Min. 12Fig. 2-2Case 1 (length: in.)28 28Inspection hatchInspection hatch 1(17-3/4×17-3/4)Inspectionhatch 2Inspection hatch 3(Same as the indoorunit size +12 or more)Control boxControl boxControl boxInspection hatch(Ceiling opening)CeilingArrow view A-1 Arow view A-2 Min. D=B+12Min. 8B*H3=Min. 3/4Model B C D40 40-7/8 5256 56-5/8 6818 • 24 • 30 type36 • 42 type(length: in.)AFig. 2-3Case 2, 3(Same as theindoor unitsize or more)• Determine the H3dimension by maintaining adownward slope of at least1/100 as specified in“7. DRAIN PIPING WORK”.