Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1992-04-26
1993-01-26
Tanner, Harry B.
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62127, 62130, 62239, 340589, 364557, F25B 4900
Patent
active
051813890
ABSTRACT:
A transport refrigeration unit, and methods and apparatus for monitoring the operation thereof, with the unit conditioning a load to a selected set point temperature via commanded cooling and heating cycles. A thermostat provides a digital signal as a function of the load temperature and the selected set point temperature, with each toggling of the least significant bit (LSB) thereof indicating a predetermined change in load temperature. A timer initiates a predetermined timing period with each toggling of the LSB, with the timing period being a dynamic function of the selected set point temperature. Expiration of the timing period before the next bit toggle initiates an alarm signal indicating the rate-of-change of load temperature is not within an acceptable limit for the selected set point temperature. A comparison of successive digital signals also results in an alarm signal when the direction of temperature change is not consistent with the commanded operating cycle.
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Hanson Jay L.
Jurewicz Romuald M.
Lackey D. R.
Tanner Harry B.
Thermo King Corporation
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