Service manual

5
-22 -4 14 32 50 68
86
104 122 140
-73
0
73
145
218
290
363
435
508
580
(PSIG)
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(°F)
1. Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
R410A tools
Can R22 tools
be used?
Description
Gauge manifold No
R410A has high pressures beyond the measurement range of existing gaug-
es.
Charge hose No Hose material have been changed to improve the pressure resistance.
Gas leak detector No Dedicated for HFC refrigerant.
Torque wrench
Yes 1/4 in. and 3/8 in.
No 1/2 in. and 5/8 in.
Flare tool Yes Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Flare gauge New Provided for flaring work (to be used with R22 flare tool).
Vacuum pump adapter
New
Provided to prevent the back flow of oil. This adapter enables you to use vac-
uum pumps.
Electronic scale for refrigerant
charging
New
It is difficult to measure R410A with a charging cylinder because the refriger-
ant bubbles due to high pressure and high-speed vaporization
No: Not Substitutable for R410A Yes: Substitutable for R410A
2. Refrigerant piping
Specifications
Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications.
Outside diameter (in.) Wall thickness (in.) Insulation material
1/4 0.0315
Heat resisting foam plastic Specific gravity 0.045
Thickness 0.315 in.
3/8 0.0315
1/2 0.0315
5/8 0.0394
Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to Installation manual “FLARING WORK”.
Pipe diameter (in.)
Dimension of flare nut mm (in.)
R410A R22
1/4 17 (11/16) 17 (11/16)
3/8 22 (7/8) 22 (7/8)
1/2 26 (1-1/32) 24 (15/16)
5/8 29 (1-5/32) 27 (1-1/16)