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Refrigerant Charging; Remedies To Be Taken In Case Of A Refrigerant Leak - Mitsubishi Electric CAHV-P500YA-HPB Service Handbook

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[6] Refrigerant Charging

Cylinder with a siphon
Cylinder color R407C is Gray.
Charge refrigerant through the
check joint on the high-pressure side.
1. Reasons
R407C is a mixture of 3 refrigerants, each with a different evaporation temperature. Therefore, if the equipment is charged
with R407C gas, then the refrigerant whose evaporation temperature is closest to the outside temperature is charged frist
while the rest of refrigerants remain in the cylinder.
2. Notes
When using a cylinder with a siphon, refrigerant is charged in the liquid state without the need for turning it upside down. Check
the type of the cylinder on the label before use.

[7] Remedies to be taken in case of a Refrigerant Leak

If the refrigerant leaks out, all of the remaining refrigerant must be replaced with a new charge to maintain the proper composition
of the refrigerant. Repair the leak, and then charge the system with the specified amount of refrigerant (5.5 kg). (Charge refrigerant
in the liquid state.)
Refer to "IX [4] Refrigerant Leak."(page 138)
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Cylinder without a siphon
Refrigerant charging in the liquid state
Charging refrigerant through the
check joint on the low-pressure side
will create reverse pressure,
resulting in compressor malfunctions.


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