Environmental control unit for harsh conditions
AssigneeHunter Manufacturing Co.
InventorsJohn L. Creed, Steven G. Skinner, Robert K. Crowder
Life of this patent
Estimating the term…
Abstract
A method of controlling an air conditioning system of the type having a variable capacity compressor circulating refrigerant through a condenser, an expander, an evaporator and returning to the compressor. Sensors are disposed to sense a refrigerant condition selected from one of pressure and temperature on one or both the compressor high pressure and low pressure side; and, in the event of an overload condition, the sensors generate a control signal that effects operation of an actuator for moving a member in the compressor to vary the compressor capacity to the lowest capacity output. Alternatively, the generated control signal may vary the compressor speed.
Claims14
1-6. (canceled)
A method of controlling refrigerant circulating through a variable capacity compressor, an exothermic heat exchanger, an expander, an endothermic heat exchanger and return comprising:
- (a) sensing a refrigerant condition on the compressor high side;
- (b) sensing a refrigerant condition on the compressor low side;
- and,
- (c) reducing the compressor variable capacity when an overload condition is sensed in one of steps (a) and (b).
19-23. (canceled)
Dependencies are inferred from the claim text.