Daikin VRV III REYQ8PY1, Service Manual

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Si37-701 Precautions for New Refrigerant (R-410A)
Precautions for New Refrigerant (R-410A) 427
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
As 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.
Charging cylinder
✕
{
2
Weighting instrument used for HFCs.
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
{
Charge mouthpiece
✕
2
Seal material is different between
R
-
22 and HFCs.
2
Thread specification is different
between R-410A and others.
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
φ
6.4
φ
9.5
φ
12.7
φ
15.9
φ
19.1
φ
22.2
φ
25.4
φ
28.6
φ
31.8
φ
38.1
φ
44.5
Ve-up
R-407C
Material
O
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Ve-up
11
R-410A
Material
O
O
O
O
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
1/2H
Thickness
t (mm)
0.8
0.8
0.8
1.0
1.0
1.0
1.0
1.0
1.2
1.4
1.6
Thickness
t (mm)
0.8
0.8
0.8
1.0
1.0
1.0
1.0
1.0
1.1
1.4
1.6