Daikin VRV III, Руководство по обслуживанию, Страница: 553 / 567

Precautions for New Refrigerant (R-410A) SiUS34-801A_b
538 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.
Tool compatibility
For the charge mouthpiece and packing, 1/2UNF20 is necessary for mouthpiece size of charge
hose.
Copper tube material and thickness
* O: Soft (Annealed)
H: Hard (Drawn)
Tool
Compatibility
Reasons for change HFC HCFC
R-410A R-407C R-22
Gauge manifold
Charge hose
2
Do not use the same tools for R-22 and
R-410A.
2
Thread specification differs for R-410A
and R-407C.
Gas detector
2
The same tool can be used for HFCs.
Vacuum pump
(pump with reverse flow
preventive function)
2
To use existing pump for HFCs,
vacuum pump adaptor must be
installed.
Weighting instrument
Flaring tool (Clutch type)
2
For R-410A, flare gauge is necessary.
Torque wrench
2
Torque-up for 1/2 and 5/8
Pipe cutter
Pipe expander
Pipe bender
Pipe assembling oil
2
Due to refrigerating machine oil
change. (No Suniso oil can be used.)
Refrigerant recovery
device
Check your recovery device.
Refrigerant piping See the chart below.
2
Only
φ
19.1 is changed to 1/2H material
while the previous material is "O".
Pipe size
[in]
φ
1/4”
φ
3/ 8 ”
φ
1/2”
φ
5/ 8 “
φ
3/4”
φ
7/ 8 ”
φ1.0
”
φ
1-1/ 8 ”
φ
1-5/16”
φ
1-1/2”
φ
1-3/4”
Material
O
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Material
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Thickness
[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
1.2/32
1.4/32
1.6/32
Thickness
[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
R-407C R-410A