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3 Branching cannot be made after header branching (corresponding parts are
marked with
in the diagram below).
To the outdoor unit
To the outdoor unit
CAP
4 Do not install outdoor unit piping when it is raining.
5 Commercially available piping often contains dust and other materials. Always
blow it clean with a dry inert gas.
6 Use care to prevent dust, water or other contaminants from entering the piping
during installation.
7 Reduce the number of bending portions as much as possible, and make bend-
ing radius as big as possible.
8 For indoor and outdoor branching, be sure to use the following twinning pipe
sets (sold separately).
9 Use an adapter if a specified refrigerant pipe has a different diameter from that
of a branching pipe.
0 Braze only with non-oxide brazing material for piping. Failure to do so
may damage the compressor. Be sure to perform the non-oxidation braz-
ing with a nitrogen purge.
Do not use any commercially available anti-oxidizing agent since it may
cause pipe corrosion and degrading of the refrigerant oil.
Please contact Mitsubishi Electric for more details.
(Refer to item 10.2. for details of the piping connection and valve operation)
A Always insulate the piping properly. Insufficient insulation will result in a de-
cline in heating/cooling performance, water drops from condensation forming
and other such problems. (Refer to item 9 for installation of refrigerant piping.)
B When connecting the refrigerant piping, make sure the valve of the outdoor
unit is completely closed (the factory setting). Do not operate it until the refrig-
erant piping for the outdoor and indoor units has been connected, a refrigerant
leakage test has been performed, and the evacuation process has been com-
pleted.
C Never use refrigerant to perform an air purge. Always evacuate using a
vacuum pump.
D Be sure to charge the system using liquid refrigerant.
E Either a lack or an excess of refrigerant causes the unit to make an emergency
stop. Charge the system with an appropriate amount of refrigerant. When serv-
icing, always check the notes concerning pipe length and amount of additional
refrigerant at both locations, the refrigerant volume calculation table on the
back of the service panel and the additional refrigerant section on the labels
for the combined number of indoor units. (Refer to item 9.2. for detailed infor-
mation on refrigerant piping system.)
9.2. Refrigerant piping system
Connection Example
[Fig. 9.2.1]
[Outdoor model : P72 ~ P96]
B
A
B C D
e
a b c d
C
C
CCC
A
B
A
a
b
c d e
C
D
CC
CC
A
F
Warning:
When installing and moving the unit, do not charge the system with any
other refrigerant other than the refrigerant specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-
function and may result in severe damage.
Caution:
• Use a vacuum pump with a reverse flow check valve.
- If the vacuum pump does not have a reverse flow check valve, the vacuum
pump oil may flow back into the refrigerant cycle and cause deterioration of
the refrigerant oil.
• Do not use the tools shown below used with conventional refrigerant.
(Gauge manifold, charge hose, gas leak detector, check valve, refrigerant
charge base, vacuum gauge, refrigerant recovery equipment)
- Mixing of conventional refrigerant and refrigerator oil may cause the refriger-
ant oil to deteriorate.
- Mixing of water will cause the refrigerant oil to deteriorate.
- R410A refrigerant does not contain any chlorine. Therefore, gas leak detec-
tors for conventional refrigerants will not react to it.
• Manage the tools used for R410A more carefully than normal.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant oil will dete-
riorate.
•Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerant oil in
the existing piping will cause the new refrigerant to deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and
the compressor may fail.
• Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
• Do not use special detergents for washing piping.
Outdoor Twinning Kit model
Downstream indoor unit capacity
Less than 72 in total
CMY-Y102S-G2
Downstream indoor unit capacity
More than 73 and less than
144 in total
CMY-Y102L-G2
Downstream indoor unit capacity
More than 145 and less than
288 in total
CMY-Y202-G2
10 branches
CMY-Y1010-G
8 branches
CMY-Y108G
4 branches
CMY-Y104-G
Line branch
Header branch
Indoor twinning pipe set model
Total outdoor model
P144 ~ P192
CMY-Y100VBK2