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<Table 1>
Lower stream unit model
Lower stream unit model
More than 73 and less than
Less than 72 in total
CMY-Y102S-G2
Outdoor Twinning Kit model
Total outdoor model
Total outdoor model
P144 ~ P240
CMY-Y100VBK2
CMY-Y300VBK2
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 refrigerant oil may cause the refriger-
ant oil to deteriorate.
9.2. Refrigerant piping system
Connection Example
[Fig. 9.2.1]
[Outdoor model : P72 ~ P120]
A
A
B
C
D
B
a
b
c
d
C
C
C
C
[Outdoor model : P144 ~ P240]
u ni t 1
u ni t 2
A
A
A
A
1
2
A
B
B
a
E
C
[Outdoor model : P264 ~ P360]
u ni t 1
u n it 2
unit 3
A
A
A
A
A
A
1
2
3
A
A
4
B
a
E
E
C
8
Indoor twinning pipe set model
Line branch
Lower stream unit model
More than 145 and less than
144 in total
240 in total
CMY-Y102L-G2
CMY-Y202-G2
P264 ~ P360
e
C
C
D
e
b
c
d
C
C
C
C
B
C
D
e
b
c
d
C
C
C
C
Lower stream unit model
More than 241 in total
CMY-Y302-G2
- 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.
A
A
F
B
D
a
b
c
d
e
C
C
C
C
C
u n i t 1
u n i t 2
A
A
A
A
1
2
F
A
B
E
a
b
c
C
C
C
unit 1
unit 2
unit 3
A
A
A
A
A
A
1
2
3
A
A
4
B
E
E
a
b
C
C
Header branch
4 branches
8 branches
10 branches
CMY-Y104-G
CMY-Y108-G
CMY-Y1010-G
D
d
e
C
C
A Outdoor unit
B 1st branch
F
C Indoor unit
D Cap
E Outdoor Twinning Kit
F Header
D
c
d
e
* The total length of A
(A
1
2
C
C
C
and A
is less than 10 m [32 ft].
4
), A
3
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