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Charging Of Refrigerant - Mitsubishi Electric PRH-P8MYA Technical & Service Manual

Air-cooled rooftop packaged air conditioners.
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[5] Charging of Refrigerant

R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant.
For a cylinder with a syphon attached
Cylin-
der
Cylinder color identification
Reasons:
1. 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 first while the rest of refrigerants remain in the cylinder.
Note:
In the case of a cylinder with a syphon, liquid R407C is charged without turning the cylinder up side down. Check the
type of cylinder before charging.
R407C-Gray
R410A-Pink
Valve
Liquid
For a cylinder without a syphon attached
Cylin-
der
Charged with liquid refrigerant
- 5 -
Valve
Liquid

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