Hitachi SAMURAI CLG2, Manual, Page: 78 / 118

Maintenance
Technical Catalogue
TCGB0051 rev 0 - 09/2009
78
11.15. Servicing for R407C refrigerant system
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Refrigerant
This R407C refrigerant is HFC type so that it has a feature of no ozone depletion. If it is mixed with another
refrigerant, the serious changing would occur on its character. Therefore notice the following point when
handling this refrigerant.
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NOTE:
Charge the refrigerant in LIQUID condition and NOT in GAS. As “R407C” is zeotropic mixed refrigerant,
if gas charging is performed, only the easy vaporising refrigerant would be charged into the system and
the difficult vaporising one would be remained in the charge cylinder.
The cylinder, gauge equipped manifold and charge hose are only used for R407C refrigerant.
Adjust the cylinder setting to charge in liquid.
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Refrigeration Oil
Japan Energy “Freol” UX300, which R407C refrigerant is easy to blend into it, is used for this system. The
other oil is prohibited to use, so that not to be mixed with another kind of oil at the maintenance and service
work. This oil is very hygroscopic.
Therefore minimum humidity handling is necessary
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Servicing Equipment
When servicing R407C system, servicing equipment such as Charging Cylinder, Charging Hose, Vacuum
Pump and so on, shall not be mixed with R22 equipment to avoid R407C composition change.