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Refrigeration System.
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Pressure Relief Valve and Shaft Seal
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| 1. |
Pressure relief valve
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If adequate ventilation is not provided to the condenser, or if the cooling load becomes excessively large, the pressure at the high-pressure side of the condenser and receiver/dryer will become abnormally high, creating the danger of a burst pipe. To prevent this problem, if the pressure at the high-pressure side rises to between 3.43 MPa (35 kgf/cm²) and 4.14 MPa (42.4 kgf/cm²), the pressure relief valve opens to reduce the pressure.HINT:
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Normally, if the pressure in the refrigeration circuit rises abnormally high, the pressure switch causes the magnetic clutch to disengage. For this reason, the pressure relief valve rarely needs to operate. |
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| 2. |
Shaft seal
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The shaft seal is positioned on the compressor drive shaft. If the shaft seal deteriorates or is damaged, refrigerant will leak past the seal and the A/C performance will decrease.
HINT:
On wobble plate type compressors, the shaft seal cannot be replaced because the compressor is a non-serviceable component. |
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