Installing The Refrigerant Piping; 2 Tapping Screws; Gas Pipe Insulation (Large) - Mitsubishi Electric PSH-P-GAH Installation Manual

3. Installing the indoor unit
A
)
5-38
53-91
B
)
5-38
53-91
Fig. 3-3
1
Fig. 3-4

4. Installing the refrigerant piping

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
) (mm)
5-20
)
5-20
a
2
c
b
1mm
3.3. Mounting the tip-over prevention bracket (Fig. 3-3)
• Select one of the following mounting methods, depending on the height of the frieze
inside the wall above the floor.
• In the case of a light steel bed, a frieze is generally not used, so the bracket should
be mounted to one of the supports or pillars (obtain the screws locally).
• If the air outlet duct is to be attached to the unit ceiling panel, make sure that the
long edge of the bracket is placed against the wall. This will ensure that the bracket
does not cover the knockout holes in the unit ceiling panel or the screw holes for
attaching the air outlet duct.
A The bracket faces up
B The bracket faces down
I) The short edge of the bracket is against the wall
II) The long edge of the bracket is against the wall
• The distance between the unit and the wall can be varied.
• The vertical dimension shown is the distance from the floor to the bracket mounting
screws (the frieze center is within these limits).
• First, mount the bracket on the wall and then tighten the screw so that the bracket
can slide up and down. (Fig. 3-4)
1 Tip-over prevention bracket
2 Tapping screw
a Frieze
b Wall surface material
c Gap of about 1 mm
Floor mounting
Remove the air intake grill, open the floor mounting knockout holes in the base and
fix the anchor bolts to the floor.
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