Service Tools - Daikin ZQG71~140L7V1B Service Manual

Precautions for New Refrigerant (R-410A)
3.3

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
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
 Copper tube material and thickness
* O: Soft (Annealed)
212
Tool
R-410A
Check your recovery device.
As for the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of
charge hose.
Pipe size
Material
φ6.4
φ9.5
φ12.7
φ15.9
φ19.1
H: Hard (Drawn)
Compatibility
HFC HCFC
R-407C R-22














See the chart below.
R-407C
Thickness
t (mm)
O 0.8
O 0.8
O 0.8
O 1.0
O 1.0
Reasons for change
• 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 22 and 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 f19.1 is changed to 1/2H material
while the previous material is "O".
R-410A
Thickness
Material
O
O
O
O
1/2H
ESIE12-06
t (mm)
0.8
0.8
0.8
1.0
1.0
Appendix