Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 148

1. Safety precautions
1.5. Using R410A refrigerant air conditioners
Caution:
• Use C1220 copper phosphorus, for copper and copper alloy seamless
pipes, to connect the refrigerant pipes. Make sure the insides of the pipes
are clean and do not contain any harmful contaminants such as sulfuric
compounds, oxidants, debris, or dust. Use pipes with the specified thick-
ness. (Refer to 4.1.) Note the following if reusing existing pipes that carried
R22 refrigerant.
- Replace the existing flare nuts and flare the flared sections again.
- Do not use thin pipes. (Refer to 4.1.)
• Store the pipes to be used during installation indoors and keep both ends
of the pipes sealed until just before brazing. (Leave elbow joints, etc. in
their packaging.) If dust, debris, or moisture enters the refrigerant lines, oil
deterioration or compressor breakdown may result.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration
oil applied to the flared sections. If mineral oil is mixed in the refrigeration
oil, oil deterioration may result.
1.6. Accessories of outdoor unit (Fig. 1-1)
Joint pipe is included with the outdoor unit. Refer to 4.5.2 and use it in connection with the on-site piping.
Connected pipes diameter
mm (in)
1 ø9.52 (3/8)
2 ø22.2 (7/8)
3 ø9.52 (3/8)
4 ø22.2 (7/8)
5 ø28.58 (1-1/8)
1 2 3
Fig. 1-1
en
3
→ ø9.52 (3/8) straight
→ ø22.2 (7/8) straight
→ ø12.7 (1/2) straight
→ ø28.58 (1-1/8) straight
→ ø28.58 (1-1/8) L-shape
4 5
• Do not use refrigerant other than R410A refrigerant. If another refrigerant is
used, the chlorine will cause the oil to deteriorate.
• Use the following tools specifically designed for use with R410A refriger-
ant. The following tools are necessary to use R410A refrigerant. Contact
your nearest dealer for any questions.
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
• Be sure to use the correct tools. If dust, debris, or moisture enters the
refrigerant lines, refrigeration oil deterioration may result.
• Do not use a charging cylinder. If a charging cylinder is used, the composition
of the refrigerant will change and the efficiency will be lowered.
Shape Connect to
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Gas pipe
Tools (for R410A)
Size adjustment gauge
Vacuum pump adapter
Electronic refrigerant charging scale
Connection method
brazing 1 (SM72/96 model only)
brazing 1 (SM72/96 model only)
brazing 1 (SM120 model only)
brazing 1 (SM120 model only)
brazing 1 (SM120 model only)
Flare tool
Q'ty