FILE NO.
In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2 UNF 20 threads per inch)
•In order to increase the pressure resisting strength of the refrigerant piping, flare processing diameter and size of opposite side of flare nuts has been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)
New tools for R410ANew tools for R410A | Applicable to R22 model | Changes | |
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Gauge manifold |
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| As pressure is high, it is impossible to measure by |
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| means of conventional gauge. In order to prevent any |
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| other refrigerant from being charged, each port |
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| diameter has been changed. |
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Charge hose |
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| In order to increase pressure resisting strength, hose |
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| materials and port size have been changed (to 1/2 |
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| UNF 20 threads per inch). |
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| When purchasing a charge hose, be sure to confirm |
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| the port size. |
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Electronic balance |
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| As pressure is hight and gasification speed is fast, it |
for refrigerant charging |
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| is difficult to read the indicated value by means of |
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| charging cylinder, as air bubbles occur. |
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Torque wrench |
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| The size of opposite sides of flare nuts have been |
(nominal diam. 1/2, 5/8) |
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| increased. Incidentally, a common wrench is used for |
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| nominal diameters 1/4 and 3/8. |
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Flare tool |
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| By increasing the clamp bar’s receiving hole, strength |
(clutch type) |
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| of spring in the tool has been improved. |
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Gauge for projection | — |
| Used when flare is made by using conventional flare |
adjustment |
| tool. | |
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Vacuum pump adapter |
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| Connected to conventional vacuum pump. It is |
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| necessary to use an adapter to prevent vacuum |
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| pump oil from flowing back to the charge hose. |
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| The charge hose connecting part has two |
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| for conventional refrigerant (7/16 UNF 20 threads per |
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| inch) and one for R410A. If the vacuum pump oil |
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| (mineral) mixes with R410A a sludge may occur and |
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| damage the equipment. |
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Gas leakage detector |
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| Exclusive for HFC refrigerant. |
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•Incidentally, the “refrigerant cylinder” comes with the refrigerant designation (R410A) and protector coating in the U. S’s ARI specified rose color (ARI color code: PMS 507).
•Also, the “charge port and packing for refrigerant cylinder” require 1/2 UNF 20 threads per inch corresponding to the charge hose’s port size.
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