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A refrigeration system having a cooling circuit, a heating circuit, a pressurizing receiver tank circuit, a pilot circuit and a liquid injection circuit wherein the hot gas line includes a solenoid valve that connects an outlet of a compressor to an outlet of a receiver tank, and wherein the liquid

A refrigeration system having a cooling circuit, a heating circuit, a pressurizing receiver tank circuit, a pilot circuit and a liquid injection circuit wherein the hot gas line includes a solenoid valve that connects an outlet of a compressor to an outlet of a receiver tank, and wherein the liquid injection circuit includes a liquid injection solenoid that connects the outlet of the receiver tank to an outlet of an economizer.

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1. A refrigeration system operable to run in a cooling cycle, a heating cycle and a null cycle, the refrigeration system comprising: a compressor having a suction port and an output port, said compressor configured to receive refrigerant from the suction port, compress the refrigerant, and discharge

1. A refrigeration system operable to run in a cooling cycle, a heating cycle and a null cycle, the refrigeration system comprising: a compressor having a suction port and an output port, said compressor configured to receive refrigerant from the suction port, compress the refrigerant, and discharge the refrigerant through the output port;a condenser selectively connected to the output port and configured to selectively receive the compressed refrigerant from the compressor and condense the compressed refrigerant;an economizer having a hot section and a cooling section, the hot section and cooling section being in thermodynamic contact with each other, said hot section being connected to the condenser and selectively receiving at least one of the condensed refrigerant from the condenser and the compressed refrigerant from the compressor, said cooling section receiving a first portion of refrigerant which has passed through the hot section, a first expansion device, and a hot gas valve wherein hot gas is selectively mixed with cold two phase refrigerant coming from the first expansion device,a second expansion device connected to the hot section of the economizer and configured to receive a second portion of refrigerant which is not passed to the cooling section of the economizer;an evaporator connected to the second expansion device and configured to receive refrigerant from at least one of the second expansion device and the compressor output port;a first solenoid valve fluidly connected to the output port of the compressor, said first solenoid valve selectively allowing the compressed refrigerant to pass through the first solenoid valve to the hot gas valve and then to the cooling portion of the economizer to allow the refrigeration system to run the null cycle and to generate additional mass flow into the compressor during the heating cycle; anda second solenoid valve configured to receive condensed refrigerant which has passed through the condenser, said second solenoid valve selectively allowing the condensed refrigerant to pass through the second solenoid valve to the suction port of the compressor. 2. The refrigeration system of claim 1 further comprising a heating circuit selectively fluidly connected to the output port of the compressor, said heating circuit configured to pass compressed refrigerant to the evaporator to remove heat from the compressed refrigerant. 3. The refrigeration system of claim 2 further comprising a 3-way valve connected to the output port of the compressor and configured to selectively send compressed refrigerant from the output port to at least one of the heating circuit, the condenser, or a second suction port disposed on the compressor. 4. The refrigeration system of claim 3 further comprising a third solenoid valve disposed between the 3-way valve and the second suction port. 5. The refrigeration system of claim 1 further comprising a receiver tank connected to the condenser, a check valve, the hot section of the economizer and the second solenoid valve, the receiver tank configured to receive refrigerant from at least one of the condenser or the check valve, the receiver tank further configured to send refrigerant to at least one of the hot section of the economizer or the second solenoid valve. 6. The refrigeration system of claim 5 further comprising a 3-way valve connected to the output port of the compressor and configured to selectively send compressed refrigerant from the output port to at least one of the evaporator, the condenser, or a second suction port disposed on the compressor. 7. The refrigeration system of claim 6 further comprising an electronic throttling valve connected to the evaporator and the second suction port, the electronic throttling valve configured to receive refrigerant from the evaporator and selectively send refrigerant to the second suction port. 8. The refrigeration system of claim 5, wherein the refrigeration system is operable to run in a pump-down cycle, the system further comprising a liquid line solenoid connected to the hot section of the economizer and the second expansion device to prevent refrigerant from returning to the compressor when the refrigeration system is operating in the pump-down cycle. 9. The refrigeration system of claim 8 wherein when the refrigeration system is operating in the pump-down cycle, the first solenoid valve is closed, the second solenoid valve is closed and the liquid line solenoid is closed. 10. The refrigeration system of claim 1, wherein during the heating cycle of the refrigeration system, the first solenoid valve is configured to be opened to increase the mass flow of refrigerant into the suction port. 11. The refrigeration system of claim 1, wherein during the null cycle of the refrigeration system, the first solenoid valve is configured to be closed to direct vapor to the suction port. 12. The refrigeration system of claim 1, wherein the first solenoid valve is configured to allow the compressed refrigerant to bypass the condenser and to direct the compressed refrigerant to the cooling portion of the economizer.