Specifications

Precautions
R410A applies higher pressure than R22 and uses
refrigeration oil different from R22. Therefore, piping
works and tools are also different from those for R22
refrigerants.
Branch pipe and dividing pipe for R410A are provided
specially for REFNET piping. Since these new parts are not
interchangeable with current REFNET parts, do not use
current REFNET piping materials for R410A. (Refer to the
option list)
Use C1220 type copper tube for refrigerant piping. Wall thickness
of copper tube shown in the below table can be applied. 
(The table is same as the recommendation for R22)
Refrigeration oil
Condensing pressure
Mineral oil (Suniso)
Refrigerant
R22

(Single-component refrigerant)
1.84MPa (18.8kg/cm
2
)
Synthetic (ether) oil
R410A

(Quasi-azeotropic mixture refrigerant)
2.97MPa (30.3kgf/cm
2
)
Refrigerant Piping Materials
Precautions for Installation Work
Procedure and Tools for Refrigerant Piping Work
Other refrigerant piping materials
REFNET piping materials
Piping work for R410A model partially differs from R22 model in items and procedures of piping work and refrigerant charging due to
different component and higher pressure for R410A. The below chart shows general work procedure for R410A model.
Procedure
Recommendable oil for pipe processing
DAPHNE MASTER DRAW 510LS
·
530LS
·
565NR
·
566LS (Idemitsu Kosan Co.,Ltd.)
MASTER DRAW 5128 (ETNA PRODUCTS INC.)
Shell Drawing XA (SHELL)
* Mixing amount of oil is 30 mg/10m at maximum.
Several dedicated tools are required for the installation work of R410A models. Some of conventional tools can be used except tools
actually used to the installation work for R22 models.
Tools
Tool name Work process / Usage Interchangeability with conventional tool
Pipe cutting Interchangeable and can be used.
Dedicated flaring tool is required due to flaring dimension change.
Interchangeable and can be used. (Be strictly sure that oil does
not flow in reverse to the unit during pump stop.)
Pipe flaring
Applying to flared section
Use dedicated ether oil, ester oil, alkyl-benzene oil or mixture of
these oils.
Dedicated torque wrench is required due to different size of 1/2 "and 5/8" flare nuts.
Dedicated gauge manifold and charge hose are required due to
high pressure and prevention of intoroduction of impurities.
Previous tool cannot be used due to different refrigerant
characteristics. (Measuring instrument must be used.)
Interchangeable and can be used.
Dedicated detector is required (Use detector for R410A).
Interchangeable and can be used.
Flare nut jointing
Pipe expanding in connection of pipe
Pipe bending
Oxidation proof for inside pipe
Refrigerant charging using
vacuum and operation check
Pipe brazing
Pipe cutter
Flaring tool
Torque wrench
Pipe expander
Pipe bender
Nitrogen
Welder
Refrigerant
piping work
Air tight test
Gauge manifold
Charging hose
Charging cylinder
Weighing scale for
refrigerant charging
Gas leakage detector
Vacuum pump
From air tight test
to refrigerant
additional charging
Vacuum drying
Refrigerant additional charging
Gas leakage check
Since stricter caution should be necessary for R410A to
prevent intrusion of foreign matters into the refrigerant piping
line, be sure to conduct N2 blowing when brazing is required.
Other than brazing, a stricter work control including pipe
covering and drying is required to prevent pipe from intrusion of
foreign matters.
Joint brazing
Charge R410A from service port at liquid side stop value of
outdoor unit in liquid phase. At that time, conduct vacuum
drying using vacuum pump.
Refrigerant charging
Make sure to conduct air-tightness test.
Air-tightness test
Make sure to conduct chamfering (filing) at cut section, since a
large wall thickness of pipe results large burr. Be aware of no
cutting chips left inside pipe.
Apply appropriate amount of refrigeration oil on outer / inner
surface of flared section to prevent leakage. Make sure to 
use synthetic oil (ether oil, ester oil, archi-benzene oil or
mixture of those oils) as refrigeration oil.
Conduct installation work for R410A model following above mentioned piping work procedure. Otherwise, unit 
may have trouble. Refer to the "Work execution and control for R410A model" for the details on handling of R410A,
installation works and tools.
Flaring
Copper tube O.D.
Type O type 1/2H type
Copper tube W.T.
6.4
0.40
9.5
0.60
12.7
0.80
15.9
0.99
19.1
0.66
22.2
0.77
25.4
0.88
28.6
0.99
31.8
1.10
41.3 44.5 50.8 54.1
1.43 1.54 1.76 1.87
* The table shows the requirements of Japanese High Pressure Gas Control low. The thickness and material shall be selected in accordance with local code.
(As of Jan. 2003)
(Unit : mm)
34.9
1.21
38.1
1.32
R410A System/ Precautions on Installation
Prior to work
Work
Determination of work item
Check the refrigerant to be used
Preparing of working drawing
Mounting sleeves and inserts
Installing indoor unit
Refrigerant piping work
Drain piping work
Duct work
Insulation work
Electric work
(Connection wiring / Power supply) 
Setting various items
Foundation work for outdoor unit
Installation of outdoor unit
Air tight test
Vacuum drying
Refrigerant additional charging
Test run / Adjustment
Preparing documents required before delivery
Delivery / Operation instruction
Confirm the refrigerant is R410A or R22
(1) Check wall thickness of copper tube (Refer to the table "Wall
thickness of refrigerant pipe")
(2) Maintain cleanliness inside of pipe.
(3) Make sure to conduct N
2 blowing when brazing is required.
(4) Pay attention on pipe flaring and oil to be coated on flared section. 
(5) Be sure to use torque wrench.
(1) Make sure to conduct air tight test.
(2) Confirm the pressure of 3.8 MPa does not decrease for 24 hours.
(In case the design pressure of 3.8 MPa)
(1) Vacuum grade is -755 mmHg or lower
(2) Use dedicated vacuum pump
Preparation of documents and drawings in accordance with local
codes and standard.
(1) Confirm the correct amount of refrigerant.
(2) Be sure to charge refrigerant in liquid phase.
(3) Use the dedicated gauge manifold and charging hose.
(4)
The refrigerant amount to be charged is shown in the installation manual. 
(5) Record the added refrigerant amount to the record sheet.
* Specifications vary depending on model types. Confirm by referring to the installation manual.
( )
minimum 
requirement
Piping assembling oil
(Refrigerant oil)
5453
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