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HVACR317 - Refrigeration

HVACR317 - Refrigeration. Solenoid Valve Pump Down Systems. Solenoid Valves. A Solenoid Valves is a mechanical/electrical valve. The mechanical part is in the refrigeration or water line. The electrical portion is a coil that is attached to the top of the valve. Solenoid Valve Examples.

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HVACR317 - Refrigeration

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  1. HVACR317 - Refrigeration Solenoid Valve Pump Down Systems

  2. Solenoid Valves • A Solenoid Valves is a mechanical/electrical valve. • The mechanical part is in the refrigeration or water line. • The electrical portion is a coil that is attached to the top of the valve.

  3. Solenoid Valve Examples

  4. Solenoid Valves • The valve in the closed position is not powered, and the flow of liquid is being blocked by the plunger in the DOWN position. • In the closed position, the coil does not produce any magnetic field as it is not powered.

  5. Solenoid Valve – Closed

  6. Solenoid Valve - Open • The valve opens when the coil is powered. • The coil generates a magnetic field and pulls the plunger into the up position. • This allows fluid flow through the central passage of the valve.

  7. Solenoid Valve - Opening

  8. Solenoid Valve - Open

  9. Solenoid Valves • In refrigeration, solenoid valves mainly have two uses: • Hot Gas By-Pass Defrost • Pump Down Systems

  10. Pump Down System • The solenoid in the pump down system is used in the liquid line prior to the metering device and after the receiver. • The solenoid is in the normally closed position. • When the thermostat calls for cooling, the solenoid opens.

  11. Pump Down System • This releases refrigerant into the liquid line and raises the pressure of the system. • A pressure switch senses this pressure increase and turns on the compressor. • When the call for cooling is complete, the thermostat de-energizes the solenoid.

  12. Pump Down System • The solenoid closes and blocks the flow of refrigerant into the liquid line. • The refrigerant gets pumped into the receiver, which is mounted after the condenser coil. • Once the refrigerant is pumped down into the receiver, the pressure on the system drops.

  13. Pump Down System • Once the pressure has dropped to a pre-determined point, the pressure switch opens and shuts off the compressor.

  14. Pump Down Off Cycle

  15. Pump Down Starting Cycle

  16. Pump Down On Cycle

  17. Pump Down Satisfied Cycle

  18. Pump Down Schematic

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