Panasonic CU-4KS31NBU service manual Checklist before Servicing

9-2. Checklist before Servicing

Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of extrusion) by using the flare spacer.

Diameter of tube D		Specification A
	Flare tool for R410A		Conventional flare tool (for R22)
Dia.1/4" (6.35 mm)
	0 to 0.0196"		0.0472"
Dia.3/8" (9.52 mm)
	(0 to 0.5 mm)		(1.2 mm)
Dia.1/2" (12.7 mm)
Dia.5/8" (15.88 mm)

Size of flare

D

A

Spacer

D

A

Flare tool for R410A Conventional flare tool (R22)

Tubing precautions

Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily cover the ends of the tubing with caps or tape prior to installation.

Never use 0.0276" (0.7 mm)-thick copper tubing or tubing which is less than 0.0315" (0.8 mm) in thickness, since air conditioners with R410A are subject to higher pressure than those using R22 and R407C.

No addition of compressor oil for R410A

No additional charge of compressor oil is permitted.

No use of refrigerant other than R410A

Never use a refrigerant other than R410A.

If refrigerant R410A is exposed to fire

Through welding, etc., toxic gas may be released when R410A refrigerant is exposed to fire. Therefore, be sure to provide ample ventilation during installation work.

Caution in case of R410A leak

Check for possible leak points with the special leak detector for R410A. If a leak occurs inside the room, immediately provide thorough ventilation.

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