Refrigerant Circuit and Components: Notes
→ Refrigerant Circuit Quick-Release Connections
→ Refrigerant Circuit Switches, Sensors, and Related Connections
→ Refrigerant Circuit Pressures and Temperatures
→ Refrigerant Circuit with Expansion Valve
→ Refrigerant Circuit with Restrictor and Reservoir
→ Refrigerant Circuit Repair Information
- All components of the refrigerant circuit submitted for quality observation are always to be sealed (use original sealing caps of replacement part).
- Replace damaged or leaking components of refrigerant circuit → Refrigerant Circuit Components, Replacing .
- To date, the following replacement parts (compressor, reservoir, evaporator and condenser) have been filled with nitrogen gas. This charge is being gradually discontinued. Little or no pressure equalization is therefore noticeable on unscrewing sealing plugs from replacement parts.
Refrigerant Circuit Components, Arrangement and Influence on High and Low Pressure Sides
High pressure side: Condenser, receiver and restrictor or expansion valve to separate the high and low pressure liquid ends
High pressure results from the restrictor or expansion valve forming a constriction and causing the refrigerant to accumulate, thus leading to an increase in pressure and temperature.
Excess pressure occurs if too much refrigerant or refrigerant oil is used, the condenser is contaminated, the coolant fan is malfunctioning, the system is blocked or in the event of moisture in the refrigerant circuit (icing-up of restrictor or expansion valve).
Low pressure side: Evaporator, evaporator temperature sensor and compressor to separate high and low pressure gas ends
A drop in system pressure can be caused by loss of refrigerant, the restrictor or expansion valve (blockage), a malfunctioning compressor or an iced-up evaporator.