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3. Installing the indoor unit
Fig. 3-5
Fig. 3-6
4. Installing the refrigerant piping
4
A Ceiling surface
B Suspending bolt
C Suspending bracket
D Nut (purchased locally)
E Washer 1 (with insula-
tion)
F Washer 1 (without insu-
lation)
(mm)
A Suspending bracket
B Unit
C Double nuts (purchased locally)
D Nut (purchased locally)
E Washer 1 (with insulation)
F Washer 1 (without insulation)
4) Indoor unit preparation (Fig. 3-5)
1. Install the suspending bolts. (Procure the W3/8 or M10 bolts locally.)
Predetermine the length from the ceiling (1 within 70-90 mm).
2. Remove the intake grille.
Slide the intake grille holding knobs (at two locations) backward to open the intake
grille.
3. Remove the side panel.
Remove the side panel holding screws (one in each side, right and left) then slide the
side panel forward for removal.
3.3. Installing the indoor unit (Fig. 3-6)
Use a proper suspending method depending on the presence or absence of ceiling
materials as side.
In the absence of ceiling materials
1) Directly suspending the unit
Installing procedures
1. Install the washer 1 (with insulation) and the nut (to be locally procured).
2. Install the washer 1 (without insulation) and the nut (to be locally procured).
3. Set (hook) the unit through the suspending bolts.
4. Tighten the nuts.
Check the unit installing condition.
• Check that the unit is horizontal between the right and left sides.
• Check that the unit slopes continuously downward from the front to the rear.
• Check that the unit is not contacting the ceiling.
4.1. Precautions
4.1.1. For devices that use R407C refrigerant
• Do not use the existing refrigerant piping.
• Do not use crushed, misshapen, or discolored tubing. The inside of the tub-
ing should be clean and free from harmful sulfuric compounds, oxidants,
dirt, debris, oils and moisture.
• Store the piping to be used during installation indoors and keep both ends of
the piping sealed until just before brazing.
• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil
to coat flares and flange connections.
• Use liquid refrigerant to fill the system.
• Do not use a refrigerant other than R407C.
• Use a vacuum pump with a reverse flow check valve.
• Do not use the tools that are used with conventional refrigerants.
• Do not use a charging cylinder.
• Be especially careful when managing the tools.
• Do not use commercially available dryers.
4.1.2. For devices that use R410A refrigerant
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil
applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
specified in the table to the below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or moving the air conditioner, use only the specified refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refriger-
ant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
RP35, 50
Liquid pipe
ø6.35 thickness 0.8 mm
Gas pipe
ø12.7 thickness 0.8 mm
• Do not use pipes thinner than those specified above.
RP60-140
ø9.52 thickness 0.8 mm
ø15.88 thickness 1.0 mm
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