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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Service Tools

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Precautions for New Refrigerant (R-410A)
1.3

Service Tools

R-410A is used under higher working pressure, compared to previous refrigerants (R-22, R-407C). 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 (R-22, R-407C) can not be used for products that use new refrigerants.
Be sure to use dedicated tools and devices.
 Tool compatibility
Tool
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
As for the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of charge hose.
 Copper tube material and thickness
Pipe size
φ1/4"
φ3/8"
φ1/2"
φ5/8"
φ3/4"
φ7/8"
φ1
φ1'1/8"
φ1'1/4"
φ1'1/2"
φ1'3/4"
* O: Soft (Annealed)
H: Hard (Drawn)
248
Compatibility
HFC
R-410A
R-407C
Check your recovery device.
See the chart below.
R-407C
Thickness
Material
t (in.)
O
0.031
O
0.031
O
0.031
O
0.039
O
0.039
1/2H
0.039
1/2H
0.039
1/2H
0.039
1/2H
0.047
1/2H
0.055
1/2H
0.063
HCFC
Reasons for change
R-22
• Do not use the same tools for R-22 and R-
410A.
• Thread specification differs for R-410A and
R-407C.
• Weighting instrument used for HFCs.
• The same tool can be used for HFCs.
• To use existing pump for HFCs, vacuum
pump adaptor must be installed.
• Seal material is different between R
HFCs.
• Thread specification is different between R-
410A and others.
• For R-410A, flare gauge is necessary.
• Torque-up for 1/2 and 5/8
• Due to refrigerating machine oil change. (No
Suniso oil can be used.)
• Only φ19.1 is changed to 1/2H material while
the previous material is "O".
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)
SiUS34-907
-
22 and
R-410A
Thickness
t (in.)
0.031
0.031
0.031
0.039
0.039
0.039
0.039
0.039
0.043
0.055
0.063

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