8.Electronic scale for refrigerant charging
••Because of the high pressure and fast vaporizing speed of R410A, the refrigerant cannot be held in a liquid phase inside the charging cylinder when charging is done using the charging cylinder method, causing bubbles to form in the measurement scale glass and making it difficult to see the reading. (Naturally, the conventional R22 charging cylinder cannot be used because of the differences in the pressure resistance, scale gradation, connecting port size, etc.)
••The electronic scale has been strengthened by using a structure in which the weight detector for the refrigerant cylinder is held by four supports. It is also equipped with two connection ports, one for R22 (7/16 UNF, 20 threads) and one for R410A (1/2 UNF, 20 threads), so it can also be used for conventional refrigerant charging.
••There are two types of electronic scales, one for
Refrigerant charging is done manually by opening and closing the valve.
9.Refrigerant cylinders
••The R410A cylinders are labeled with the refrigerant name, and the coating color of the cylinder protector is pink, which is the color stipulated by ARI of the U.S.
••Cylinders equipped with a siphon tube are available to allow the cylinder to stand upright for liquid refrigerant charging.
10.Charging orifice and packing for refrigerant cylinders
••The charging orifice must match the size of the charging hose fitting (1/2 UNF, 20 threads).
••The packing must also be made of an
Fig. 7 Electronic scale for refrigerant charging
Fig. 8 Refrigerant cylinders
Fig. 9 Charging orifice and packing
Table 9 R410A tools which are usable for R22 models
| R410A tools | Usable for R22 models |
(1) | Copper tube gauge for clearance adjustment | OK |
(2) | Flaring tool (clutch type) | OK |
(3) | Manifold gauge | NG |
(4) | Charging hose | NG |
(5) | Vacuum pump adaptor | OK |
(6) | Electric gas leak detector for HFC refrigerant | NG |
(7) | Electronic scale for refrigerant charging | OK |
(8) | Refrigerant cylinder | NG |
(9) | Charging orifice and packing for refrigerant cylinder | NG |
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