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7.  HFC refrigerant_Electric gas leakage tester 
R32 refrigerant is often used for other mixed 
refrigerant (R410A, R404A, R407C etc.). Therefore, 
the usage of existing HFC detectors is possible, but in 
order to detect more accurately, we recommend to 
use detectors specially set and adjusted for R32 
detection. 

 

HFC refrigerant_Electric gas leakage tester 
 

 

 

8.  Digital scale for refrigerant charging 
R32 and R410A have high pressure level and their 
evaporation speed is high. 
Thus, if you recover the refrigerant by cylinder 
charging method, the refrigerant evaporates within the 
weighing scale glass, which makes reading the scale 
difficult, rather than liquidating the refrigerant into the 
cylinder. (Charging cylinders for R22 have different 
pressure resistance, scale, connection port size; 
therefore, they are not usable) At the same time, the 
digital scale for refrigerant charging is strengthened by 
receiving the weight of the refrigerant cylinders with 
four pillars at the corners. The connection ports of 
charging hoses have two separate ports for R22 (7/16 
UNF20) and R32/R410A (1/2 UNF20) therefore, they 
can be used for the insertion of the existing 
refrigerants. 

 

Digital scale for refrigerant charging 
 

 

 

9. Refrigerant 

cylinders 

Refrigerant cylinders for R410A are painted in pink, 
and the ones for R32 are painted in other colors that 
might subject to change according to the international 
standards. R32 is a single refrigerant, so that both 
liquid and gas insertion are possible. Additional 
charging is also possible. 
(R410A is a mixed refrigerant, so only liquid insertion 
is possible) 

 

Refrigerant cylinders 
 

 

 

10.  Connection ports of refrigerant cylinders and 

packing 

Charging ports which fit to the charging hose 
connection port size (1/2 UNF20) is needed. At the 
same time, the packing has to be of HFC resistant 
materials. 

 

Connection ports and packing 
 

 

 

 
 
 
 

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11.  Tools used for refrigerant piping installations and services 
 

 

Tools for R410A 

Common with R32 

Possibility of usage for R22 

1. 

Pipe cutters, reamers or scrapers 

○ 

○ 

2. 

Flare tools (clutch type) 

○ 

○ 

3. 

Torque wrench (1/4, 3/8) 

○ 

○ 

4. 

Torque wrench (1/2, 5/8) 

○ × 

5. 

Manifold gauges・charging hoses 

○ × 

6. 

Vacuum pumps, vacuum pump adopters 

○ 

Connection 

5/16

○ 

Connection 

1/4 

7. 

Electric gas leakage testers for HFC *1 

○ 

△

 

8. 

Digital scale for refrigerant charging 

○ 

○ 

9. 

HCF recovery devices (connection port 5/16) *2 

○ 

Connection 

5/16

○ 

Connection 

1/4 

10. 

Refrigerant cylinders (pressure resistant: FC3) 

Same specs 

×

 

× 

11. 

Refrigerant cylinders (pink) 

Other (colors that might subject to 

change according to the 
international standards). 

× 

12. 

Refrigerant cylinder connection ports and packing 

○ × 

13. 

Allen wrench (4 mm) Electric knives 

○ 

○ 

*1 

Those testers only for HCFC22 (R22), but not for HCF32 (R32) and HCF410A (R410A) cannot be for common use. 

*2 

Recovery devices which are self-certified for each HCF type can be used. 

 

[Knowledge for the common usage of tools for R410A & R32] 
 

R410A and R32 machines use different compressor oils. 

 

If unregulated compressor oil gets mixed into, it may cause damage to the machine function. 

 

Careful pump down will ensure the recovery of compressor oil, and it will minimize the remaining amount of the oil in the manifold 
gauge and charging hose. 

 

If you only perform the recovery of refrigerant and not be able to perform pump down, you have to dispose the compressor oil in 
the charging hose. 

 

[Precaution of repairing refrigerant cycle] 
 

In the brazing, open 2-way and 3-way valves, and make sure the refrigerant is completely recovered back and not remaining the 
system. 

 

When repairing outside, make sure no refrigerant is in the air, ensure good air flow, and perform the brazing. 

 

[Inserting wrong refrigerant] 
 

It may cause “not cooling” and “not heating” customer claims because each component (expansion valve, compressor, PCB) of the 
refrigeration cycle is specially adjusted for R32. 

 

At the same time, it is not subject to product warranty, if wrong refrigerant was inserted into the system. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

47 

 

Operation testing

New

Installation

Relocation

Repairing refrigerant cycle

Pump down

Refrigerant recovery

Prevention of impurity

Leakage checking

Insertion of refrigerant

• Dismantling indoor / outdoor units
• Repairing by brazing

Evacuation (Air purging) new installation and relocation for at or

more than 15 minutes, re-charging at or more than 60 minutes

Indoor / outdoor units and piping

• Displacing pipes and wires, and displacing indoor / outdoor units

・

Indoor / outdoor units installation and piping, and wiring

Removal

 

 

 
 

48 

Copper pipes are used for refrigerant piping. Pipes 
which comply with JIS Regulations need to be used. 
Room air conditioners which use R410A and R32 
have higher pressure; thus, using pipes which comply 
with the Regulations is important. 
The pipe thickness is regulated by revised JIS B 8607 
“Flaring and brazing fittings for refrigerant” and the 
pipe thickness for R410A, R32 is shown in the table. 
 
 
 

Pipe thickness 
 

O and OL materials 

Thickness (mm) 

Diameter 

Diameter 

(mm) 

R410A 

R32 

R22 

1/4 6.35 

0.80 

3/8 9.52 

0.80 

1/2 12.70 

0.80 

5/8 15.88 

1.00 

 

  For connection piping, use copper phosphate seamless pipes (1220T) as regulated in “JIS H 3300” and the pipe 

thickness is 0.8 mm. 

  In the market, there are some pipes of 0.7 mm thickness, but do not use these pipes (0.8 mm thickness has to be 

strictly followed). 

  It is recommended to use pipes whose adhesion amount of oil is at or less than 40 mg / 10 m. 

At the same time, do not use pipes with dent, de-shape, and color change (especially inside). 

For refrigerant pipe installation, be aware of moisture and dirt do not get into the pipes, and make sure of no 
refrigerant leakage. 
◎

 The procedure of flaring and precautions 

a)  Cutting of pipes：use pipe cutter and cut the pipe slowly not to de-shape the pipe. 
b)  Removal of burrs on the edge of pipe (reamer or scraper) 

If the condition of pipe edge after the deburring is no good or if burrs attaches on the flaring, it may cause 
refrigerant leakage. Turn the pipe end down and perform deburring carefully. 

c)  Insert the flare nut (use the nut which is a part of the CZ parts) 
d) Flaring 

Ensure the cleanliness of clump bar and pipe, and perform flaring carefully. 
Use the existing flare tools or flare tools for R410A. Be aware that the sizes and dimensions of flaring is different 
in each flaring tool. If you use the existing flaring tools, use flaring gauge to measure the length of the flaring part. 

 

Piping 

size 

(mm) 

Dimensions “a” (mm) 

R22 

Dimensions “a” (mm)  

R410A/R32 

a

Bar

 

Nut outer diameter (mm)

Flare tools 

Flare tools 

for R410A 

Flare tools 

Flare tools 

for R410A 

R22 

R410A 

Clutch type 

Wing nut 

type 

Clutch type  Clutch type

Wing nut 

type 

Clutch type

R32 

6.35 (1/4") 

0.5 ~ 1.0 

1.0 ~ 1.5 

0 ~ 0.5 

1.0 ~ 1.5 

1.5 ~ 2.0 

0 ~ 0.5 

17 

17 

9.52 (3/8") 

0.5 ~ 1.0 

1.0 ~ 1.5 

0 ~ 0.5 

1.0 ~ 1.5 

1.5 ~ 2.0 

0 ~ 0.5 

22 

22 

12.70 (1/2") 

0.5 ~ 1.0 

1.5 ~ 2.0 

0 ~ 0.5 

1.0 ~ 1.5 

2.0 ~ 2.5 

0 ~ 0.5 

24 

26 

15.88 (5/8") 

0.5 ~ 1.0 

1.5 ~ 2.0 

0 ~ 0.5 

1.0 ~ 1.5 

2.0 ~ 2.5 

0 ~ 0.5 

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