Refrigerant Piping System; Caution - Mitsubishi Electric Y Series Installation Manual
Air-conditioners for building application inverter outdoor unit
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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
malfunction 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
refrigerant oil to deteriorate.
9.2. Refrigerant piping system
Connection Example
[Fig. 9.2.1]
[Outdoor model : P200 ~ P500YKA]
A
B
C
C
C
C
[Outdoor model : P550 ~ P1000YSKA, EP400 ~ EP700YSKA]
unit 1
unit 2
A
A
B
E
C
[Outdoor model : P1050 ~ P1500YSKA, EP750 ~ EP1100YSKA]
unit 1
unit 2
unit 3
A
A
A
B
E
E
C
C
C
C
C
C
C
C
C
C
- Mixing of water will cause the refrigerant oil to deteriorate.
- R410A refrigerant does not contain any chlorine. Therefore, gas leak
detectors 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
deteriorate.
• 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
F
B
D
C
C
C
C
C
unit 1
unit 2
A
A
F
B
E
C
C
C
C
unit 1
unit 2
unit 3
A
A
A
F
B
E
E
C
C
C
D
C
A Outdoor unit
B 1st branch
C Indoor unit
D Cap
E Outdoor Twinning Kit
F Header
D
* The total length of A
(A
), A
1
2
A
is less than 10 m.
4
C
C
11
and
3
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