Daikin RXYQ96PYDN Service Manual page 553

Precautions for New Refrigerant (R-410A)
1.2 Service Tools
R-410A is used under higher working pressure, compared to previous refrigerants (R-22,R-407C).
The refrigerating machine oil has been changed from Suniso oil to Ether oil, and if oil mixing occurs,
sludge builds in the refrigerants and causes other problems. Therefore, gauge manifolds and
charge hoses with a previous refrigerant (R-22,R-407C) cannot be used for products with new
refrigerants.
Be sure to use dedicated tools and devices.
Gauge manifold
Charge hose
Gas detector
Vacuum pump
(pump with reverse flow
preventive function)
Weighting instrument
Flaring tool (Clutch type)
Torque wrench
Pipe cutter
Pipe expander
Pipe bender
Pipe assembling oil
Refrigerant recovery
device
Refrigerant piping
* O: Soft (Annealed)
538
Tool compatibility
Tool
For the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of charge
hose.
Copper tube material and thickness
Pipe size
[in]
φ1/4"
φ3/8"
φ1/2"
φ5/8"
φ3/4"
φ7/8"
φ1.0"
φ1-1/8"
φ1-5/16"
φ1-1/2"
φ1-3/4"
H: Hard (Drawn)
Compatibility
HFC HCFC
R-410A R-407C R-22
Check your recovery device.
See the chart below.
R-407C
Thickness
Material
[in]
O 0.8/32
O 0.8/32
0.8/32
O
O 1.0/32
O 1.0/32
1/2H 1.0/32
1/2H 1.0/32
1/2H 1.0/32
1/2H 1.2/32
1/2H 1.4/32
1/2H 1.6/32
SiUS34-801A_b
Reasons for change
2Do not use the same tools for R-22 and
R-410A.
2Thread specification differs for R-410A
and R-407C.
2The same tool can be used for HFCs.
2To use existing pump for HFCs,
vacuum pump adaptor must be
installed.
2For R-410A, flare gauge is necessary.
2Torque-up for 1/2 and 5/8
2Due to refrigerating machine oil
change. (No Suniso oil can be used.)
2Only φ19.1 is changed to 1/2H material
while the previous material is "O".
R-410A
Thickness
Material
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Precautions for New Refrigerant (R-410A)
[in]
0.8/32
0.8/32
0.8/32
1.0/32
1.0/32
1.0/32
1.0/32
1.0/32
1.1/32
1.4/32
1.6/32