Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1987-10-23
1988-12-13
Tanner, Harry B.
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62129, 62158, 62160, 62127, F25B 4900, F25B 1300
Patent
active
047901438
ABSTRACT:
A method and apparatus for monitoring and protecting a transport refrigeration system, and a load in a load space to be conditioned by the transport refrigeration system. The temperature of the air discharged by the transport refrigeration system into the load space is compared with the returning air temperature to provide a signal D responsive to the algebraic difference. Signal D, which represents the actual conditioning mode, is compared with the commanded conditioning mode of the transport refrigeration system, and also with reference values selected according to whether or not the selected set point temperature of the load space is above or below a predetermined heat lock out temperature, to detect improper operating modes and other malfunctions of the transport refrigeration system, as well as insufficient refrigerant charge. First and second timers initiate first and second consecutive resettable time delays in response to such detections, after which warning and shut-down signals are respectively provided when the first and second resettable time delays are allowed to expire.
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Lackey D. R.
Tanner Harry B.
Thermo King Corporation
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