Installing The Refrigerant Piping - Mitsubishi Electric Mr.Slim PCA-M-HA Series Installation Manual

3. Installing the indoor unit
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4. Installing the refrigerant piping

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A Ceiling surface
B Suspending bolt
C Suspending bracket
D Nut (purchased locally)
E Washer 1 (with insulation)
F Washer 1 (without insulation)
Fig. 3-5
A Suspending bracket
B Unit
C Double nuts (purchased locally)
D Nut (purchased locally)
E Washer 1 (with insulation)
F Washer 1 (without insulation)
Fig. 3-6
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)
(mm)
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
• 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.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant 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
pressure 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.
Liquid pipe ø9.52 thickness 0.8 mm
Gas pipe ø15.88 thickness 1.0 mm
• Do not use pipes thinner than those specified above.
M71