Installing The Refrigerant Piping - Mitsubishi Electric Mr. Slim PCA-RP71HAQ Manual De Instalación

3. Installing the indoor unit
Fig. 3-5
Fig. 3-6

4. Installing the refrigerant piping

4
Ceiling surface 4) Indoor unit preparation (Fig. 3-5)
Suspending bolt
1. Install the suspending bolts. (Procure the W3/8 or M10 bolts locally.)
Suspending bracket
Predetermine the length from the ceiling (
Nut (purchased locally)
2. Remove the intake grille.
Washer (with insulation) Slide the intake grille holding knobs (at two locations) backward to open the intake
Washer (without insulation)
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.
(mm) 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
2. Install the washer
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.
Suspending bracket
Unit
Double nuts (purchased locally)
Nut (purchased locally)
Washer (with insulation)
Washer (without insulation)
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 tubing
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 compounds,
oxidants, debris, or dust.
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with
any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pres-
sure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing product safety.
• Do not use pipes thinner than those specified above.
(with insulation) and the nut (to be locally procured).
(without insulation) and the nut (to be locally procured).
Warning:
RP35, 50
Liquid pipe ø6.35 thickness 0.8 mm
Gas pipe ø12.7 thickness 0.8 mm
within 70-90 mm).
RP60-140
ø9.52 thickness 0.8 mm
ø15.88 thickness 1.0 mm