Mitsubishi Electric City Multi Y Série Manuel D'installation page 20

3 Refrigerant Charging
Since the refrigerant used with the unit is nonazerotropic, it must be charged in the liquid state. Consequently, when charging the unit with refrigerant
from a cylinder, if the cylinder does not have a syphon pipe, charge the liquid refrigerant by turning the cylinder upside-down as shown below. If the
cylinder has a syphon valve like that shown in the figure at the right, the liquid refrigerant can be charged with the cylinder standing upright.
Therefore, give careful attention to the cylinder specifications. If the unit should be charged with gas refrigerant, replace all the refrigerant with new
refrigerant. Do not use the refrigerant remaining in the cylinder.
A
A R407C cylinder
B Syphon pipe
C Liquid refrigerant
Note:
Always add an appropriate amount of refrigerant. (For the refrigerant additional charge, see pages 13 to 14 .) Also always seal the system
with liquid refrigerant. Too much or too little refrigerant will cause trouble.
Use a gauge manifold, charging hose, and other parts for the refrigerant indicated on the unit.
Note that it is not possible to determine if a correct amount is being used with the accumulator level (AL).
Warning:
When installing or moving the unit, do not charge it with refrigerant other than the refrigerant (R407C) specified on the unit.
- Mixing of different refrigerant, air, etc. may cause the refrigerant cycle to malfunction and 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 deteriora-
tion of the refrigerator oil and other trouble.
• Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
• 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 refrigerator oil to deteriorate.
- Mixing of water will cause the refrigerator oil to deteriorate.
- R407C refrigerant does not contain any chlorine. Therefore, gas leak detectors for conventional refrigerants will not react to it.
• Manage the tools more carefully than normal.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerator oil will deteriorate.
20
[When cylinder does not have a syphon pipe]
A
(Refrigerant can be charged with the
B
C
[When cylinder has a syphon pipe
cylinder standing upright.)]