Panasonic CU-E18CKR Service Manual page 58

- For detecting small amounts of gas leakage, use the electric
gas leak detector for HFC refrigerant. (Detection sensitivity
with R410A is about 23 g/year).
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
measurementscale 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 10-kg
cylinders and one for 20-kg cylinders. (The 10-kg cylinder is
recommended.)
Refrigerant charging is done manually by opening and closing
Fig. 5 Vacuum pump adaptor
Fig. 6 Electric gas leak detector for HFC refrigerant