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Refrigeration System
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Receiver/Dryer and Sight-Glass
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| 1. |
Receiver/dryer
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| The receiver temporarily stores the liquid refrigerant supplied from the condenser and supplies the required amount of refrigerant to the evaporator. The dryer contains a desiccant and strainer and eliminates foreign matter or moisture in the refrigeration cycle. If moisture is evident in the refrigeration cycle, it will corrode components and freeze inside the expansion valve, which will cause the system to block. |
| 2. |
Sight-glass
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| (1) |
Function
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| A sight-glass is an inspection hole used to observe the refrigerant flowing inside the refrigeration cycle and to check the level of the refrigerant. |
| (2) |
Construction
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| There are 2 types: one is installed at the outlet of the receiver and the other in the piping between the receiver and the expansion valve. |
| (3) |
Notes during inspection
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Generally, if lots of continuous bubbles are seen in the sight-glass, the amount of refrigerant is insufficient. Alternatively, if a few, occasional bubbles are seen, the amount of refrigerant can be judged as appropriate.
HINT:
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In cases where there is no refrigerant or excessive refrigerant, no bubbles will be seen |
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On modern vehicles where the A/C system contains a sub-cool type condenser, the correct volume of refrigerant will cause the sight glass to give the appearance of being over filled. Therefore, the refrigerant quantity will be insufficient if the sight glass has the appearance of a normal, non sub-cool type A/C system. |
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(27)
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