Installing The Refrigerant Piping - Mitsubishi Electric PCA-RP-GA Installation Manual

3. Installing the indoor unit
1
Fig. 3-4
b
a
Fig. 3-5
Fig. 3-6
A
C
D
E
F
G
H
C
Fig. 3-7

4. Installing the refrigerant piping

4
A
C
B
(mm)
7–12
B
3.2.4. Indoor unit preparation (Fig. 3-4)
1. Install the suspending bolts. (Procure the W3/8 or M10 bolts locally.)
Predetermine the length from the ceiling (1 within 100 mm).
A Ceiling surface
B Suspending bolt
C Suspending bracket
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
Use a proper suspending method depending on the presence or absence of ceiling
materials as follows. (Fig. 3-5)
In the absence of ceiling materials
a Suspending bracket
b Unit
1) Directly suspending the unit (Fig. 3-6)
Installing procedures
1. Install the washer 1 (supplied with the unit) and the nut (to be locally procured).
2. Set (hook) the unit through the suspending bolts.
3. 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.
When embedding pipes, into the wall
2) Installing the suspending bracket first onto the ceiling (Fig. 3-7)
Installing procedures
1. Remove the suspending brackets, U-shaped washers, and suspending bracket
holding screws from the unit.
2. Adjust the suspending bracket holding bolts on the unit.
3. Attach the suspending brackets to the suspending bolts.
4. Set (hook) the unit to the suspending brackets.
∗ Be sure to install the U-shaped washers.
A Bolt
B Unit
C Washer
D Suspending bracket holding screw
E Bolt
F Washer 1
G Double nuts
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.
(mm)
H 50 900 - 905
50GA2, 60, 71, 100 1207 - 1212
125, 140 1514 - 1519