Service Tools - Daikin VRV REYQ96MTJU Design, Installation & Testing Instruction

Precautions for New Refrigerant (R410A)
1.3

Service Tools

R410A is used under higher working pressure, compared to previous refrigerants (R22,R407C).
Furthermore, the refrigerating machine oil has been changed from Suniso oil to Ether oil, and if oil
mixing is occurred, sludge results in the refrigerants and causes other problems. Therefore, gauge
manifolds and charge hoses that are used with a previous refrigerant (R22,R407C) can not be used
for products that use new refrigerants.
Be sure to use dedicated tools and devices.
Gauge manifold
Charge hose
Charging cylinder
Gas detector
Vacuum pump
(pump with reverse flow
preventive function)
Weighting instrument
Charge mouthpiece
Flaring tool (Clutch type)
Torque wrench
Pipe cutter
Pipe expander
Pipe bender
Pipe assembling oil
Refrigerant recovery
device
Refrigerant piping
218
Tool compatibility
Tool
R410A
Check your recovery device.
As for the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of
charge hose.
Compatibility
HFC HCFC
R407C R22
2Do not use the same tools for R22 and
✕
2Thread specification differs for R410A
✕
2Weighting instrument used for HFCs.
✕
2The same tool can be used for HFCs.
2To use existing pump for HFCs, vacuum
2Seal material is different between R22
✕
2Thread specification is different between
2For R410A, flare gauge is necessary.
2Torque-up for 1/2 and 5/8
2Due to refrigerating machine oil change.
✕
2Only φ19.1 is changed to 1/2H material
See the chart below.
Reasons for change
R410A.
and R407C.
pump adaptor must be installed.
and HFCs.
R410A and others.
(No Suniso oil can be used.)
while the previous material is "O".
Precautions for New Refrigerant (R410)
Si39-406