06-14
1. Countermeasure when the refrigerant leaks
As R407C is zeotropic refrigerant, the composition of the remaining refrigerant changes when the refrigerant leaks.
Therefore, recharging refrigerant cannot be done. Recover the remaining refrigerant and charge the specified amount
of new refrigerant.
2. Never use the existing refrigerant piping
The existing piping used for R22 cannot be used for HFC series refrigerant as the conventional mineral oils are adhering
to the piping. If new synthetic oil is mixed with residual oil (ex : mineral type), they may deteriorate, and block the capillary
tubes, or cause a compressor failure.Therefore, basically use a brand new pipe. However, in the case of the existing
piping buried in the wall and replacement with new piping is difficult, wash the piping fully with detergent. It is desirable
that the amount of residual oil in connection pipes is less than 40mg/10m.
3. Replacement of refrigeration circuit parts
As refrigerant circuit parts are basically different from conventional parts, be sure to use the parts suitable for the
refrigerant when replacing. For R407C, the materials should being reviewed.
4. Check not to charge with wrong refrigerant
As there are air conditioner models using different refrigerant such as R22, R407C, make sure not to use wrong
refrigerant when installing and servicing.
5. Storage of parts
When storing parts, make such treatment as packing the parts in bags so as to avoid dusts, water, etc.
6. Replacing parts
When replacing parts, be sure to check if the parts are suitable for the refrigerant (model). Although many refrigeration
circuit parts have same appearance, however, their inside materials are different.
When changing compressor, complete brazing work within 15 minutes after removing the compressor cap. Because
the moisture in air will enter the compressor and the new synthetic oil will absorb the moisture causing sludge.
When changing dryer, complete brazing work within one hour after the package of dryer is opened, because the desiccant
starts to absorb the water content as soon as the package of dryer is opened.If it absorbs too much water content when
replacing, it cannot absorb fully the water content in the refrigerating circuit.
6-6 PRECAUTIONS FOR SERVICING
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