Daikin RZP100DVAL [113/255] Cautions in handling new refrigerant

Daikin FHYCP50DVE [113/255] Cautions in handling new refrigerant
Maintenance Inspections SiE25-110
104 Troubleshooting
1.2 Cautions in Handling New Refrigerant
The working pressure of the new refrigerant R-407C is rather high as compared to the
conventional refrigerants R-22, and the applicable refrigerant oil is different from one to R-22.
Therefore, some service work and tools for piping may not be allowed for use with the new
refrigerant.
Required tools Special tools are required to carry out service work for the refrigerant circuit on units using the
new refrigerant. Select tools referring to the following table.
Compatibility of representative tools and devices used for piping work
Refrigerant
Previous refrigerant New refrigerant
R-22 (Single refrigerant) R-407C (Mixed refrigerant)
Refrigerating machine oil Mineral oil (Suniso) Synthetic oil (Ether oil)
Condensation pressure 1.84MPa (18.8kg/cm
2
)2.01MPa (20.5kg/cm
2
)
Tool Work process·Purpose
Compatibility with conventional tools
(used for R-22 refrigerant)
Pipe cutter
Refrigerant piping work
Pipe cutting
Compatible and can be used.
Flaring tool Pipe flaring
Refrigerant oil Applying on flare sections
Use special ether-base oil, ester-base oil,
alkylbenzene-base oil, or mixed oil of these oils.
Torque wrench Jointing flare nuts
Compatible and can be used.
Expanding tool
(Expander)
Expanding in pipe connection
Pipe bender Bending pipe
Nitrogen
Air tight test
Preventing oxidation inside pipes
Welder Brazing pipes
Gauge manifold
From air tight test to
refrigerant additional
charging
Refrigerant charging with
vacuuming , and checking
equipment operation
Gauge manifold designed for the new refrigerant is
necessary since the pressure is high and cannot be
measured by conventional manifold.
Charge hose
Charge hose designed for the new refrigerant is
necessary since the refrigerant leaks and intrusion
of impurities can occur.
Vacuum pump Vacuum drying
Compatible and can be used.
Pay utmost care for oil not to return into the unit
during pump stops operation.
Charging cylinder
Refrigerant additional
charging
Not required since a scale is used for refrigerant charging.
Scale for refrigerant charging Compatible and can be used.
Gas leakage detector Checking gas leakage
Detector designed for the new refrigerant is necessary.
(Detector for R134a can be used.)
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