Service Tools - Daikin SkyAir RZQ-P Series Service Manual

Precautions for New Refrigerant (R-410A)
5.2

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)
H: Hard (Drawn)
166
Tool
R-410A R-407C
Check your recovery
See the chart below.
As for the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of
charge hose.
Pipe size
Material
φ1/4"
O
φ3/8"
O
φ1/2"
O
φ5/8"
O
φ3/4"
O
φ7/8"
1/2H
φ1
1/2H
φ1'1/8"
1/2H
φ1'1/4"
1/2H
φ1'1/2"
1/2H
φ1'3/4"
1/2H
Compatibility
HFC HCFC
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.)
device.
• Only 19.1 is changed to 1/2H material while
the previous material is "O".
R-407C
Thickness
t (in.)
0.031
0.031
0.031
0.039
0.039
0.039
0.039
0.039
0.047
0.055
0.063
SiUS28-902_B
Reasons for change
-
22 and
R-410A
Thickness
Material
t (in.)
O 0.031
O 0.031
O 0.031
O 0.039
1/2H 0.039
1/2H 0.039
1/2H 0.039
0.039
1/2H
0.043
1/2H
1/2H 0.055
1/2H 0.063
Appendix