| Layout of the refrigerant circuit components and its influence on the high and low pressure sides |
| The liquid tank condenser is found on the high pressure side, together with the choke or expansion valve, as separation between the high pressure side and the low pressure side of the liquid. |
| The high pressure is caused due to the choke or expansion valve forming a narrowing where the refrigerant is accumulated, thus leading to an increase in pressure and temperature. |
| Excessive pressure is produced if the circuit is filled with too much refrigerant or refrigerant oil, the condenser is dirty, the radiator breaks down, the system is blocked, or there is humidity in the refrigerant circuit (freezing of the choke or expansion valve). |
| The evaporator, the collector tank and the evaporator temperature sensor are found on the low pressure side, together with the compressor, as separation between the high pressure side and the low pressure side of the gas. |
| A drop in pressure may occur in the system due to a loss of refrigerant, a fault in the choke or expansion valve (no narrowing), a fault in the compressor, or freezing of the evaporator. |
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