Disturbance | Cause | Remedy | |
| Ice blockage in | Heat injection area on | Blow N2 through system. |
| capillary tube. | evaporator with cloth | Install outsize service |
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| with hot water. If | filter. Ensure careful |
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| refrigerant now can be | evacuation. Start |
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| heard to flow more | compressor. Stop when |
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| quickly through the | warm. Evacuate system |
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| system, ice blockage in | again. With heavy |
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| capillary tube is indicated. | contamination of system |
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| Alternatively, stop | it is necessary to repeat |
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| compressor and let | this process several |
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| evaporator defrost and | times. Filter can be |
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| start compressor again. In | replaced again. |
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| case of ice blockage, frost |
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| formation on the |
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| evaporator will increase |
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| initially and then return to |
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| its original level. |
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| No or very little | Mount a service valve on | If volumetric check |
| compressor capacity. | charging pipe and check | indicates insufficient |
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| suction pressure. Pressure | compressor capacity, |
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| conditions indicate no or | replace compressor. Note |
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| very little compressor | that defects in the |
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| capacity. Test | compressor can be caused |
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| compressor. | by complete or partial |
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| blockage at another point |
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| in the system. This |
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| situation must be |
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| remedied before a new |
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| compressor is installed. |
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| Capillary tube | Symptoms resemble those | Replace refrigerating |
| mounted incorrectly | of loss of refrigerant. | evaporator. |
| at injection site (roll- |
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| bond evaporator). |
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Insufficient | Thermostat is set too | Turn thermostat knob | Replace thermostat. |
refrigerating/freezing. | high. | clockwise. Check to |
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| ensure that phial is |
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| correctly installed. |
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7.