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57 

3.  Torque wrenches (diameters 1/2, 5/8) 
In order to strengthen the compressive strength, the 
diameters of wrenches change depending on the flare 
nut sizes. 

 

Torque wrenches 
 

 

 

Differences in torque wrenches 
 

 

R32 

(common R410A) 

R22 

1/2 

(diameter × torque) 

26 mm × 55 N•m 

(550 kgf•m) 

24 mm × 55 N•m 

(550 kgf•m) 

5/8 

(diameter × torque) 

29 mm × 65 N•m 

(650 kgf•m) 

27 mm × 65 N•m 

(650 kgf•m) 

 

4. Manifold 

gauges 

R22 gauges cannot be used because of the high 
pressures. 
 
Each port of manifold has different shapes in order 
to prevent inserting wrong refrigerant. 
*However, the port shape for R410A and R32 is the 
same; therefore, attention need to be paid not to insert 
wrong refrigerant. 

 

Differences in high/low pressure gauges 
 

 

R32 

(common R410A) 

R22 

High pressure 

gauges (red) 

-0.1 ~ 5.3 MPa 

-76 cmHg ~ 53 kgf / cm

2

 

-76 cmHg ~ 35 kgf / cm

2

Low pressure 

gauges (blue) 

-0.1 ~ 3.8 MPa 

-76 cmHg ~ 38 kgf / cm

2

 

-76 cmHg ~ 17 kgf / cm

2

 

Difference in manifold port sizes 
 

 

R32 

(common R410A) 

R22 

Port sizes 

1/2 UNF20 

7/16 UNF20 

 

5. Charging 

hoses 

The pressure resistance of charge hoses is increased. 
At the same time, the material is changed to HFC 
resistant, and the size of each manifold adopter is 
changed, as the port size of manifold gauge itself. 
Further, some hoses are with anti-gas pressure 
backflow valves placed near the adopters. (hoses with 
the valves recommended) 

 
 
 

Manifold gauges / Charging hoses 
 

 

 

Differences in charging hoses 
 

 

R32 

(common R410A) 

R22 

Pressure 

Resistance 

Normal 

operation 

pressure 

5.1 MPa 

(52 kgf / cm

2

) 

3.4 MPa 

(35 kgf / cm

2

) 

Burst 

pressure 

27.4 MPa 

(280 kgf / cm

2

) 

17.2 MPa 

(175 kgf / cm

2

) 

Material 

HNBR rubber 
Internal nylon 

coating 

NBR rubber 

 

6.  Vacuum pump and Vacuum pump adopter 
When using a vacuum pump, it is necessary to set a 
solenoid valve in order to prevent backflow of vacuum 
pump oil into the charge hoses, and use a vacuum 
pump with oil backflow prevention function, or use the 
vacuum pump with vacuum pump adopter.  
If vacuum pump oil（mineral oil-based）mixes with 
R410A (R32), it may cause damage to the machine. 

 

Vacuum pump 
 

 

 
Vacuum pump adopter 
 

 

 

 
 
 

58 

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 
 

 

 

 
 
 
 

59 

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. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

60 

 

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