Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1989-10-04
1990-08-21
Tanner, Harry B.
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62127, 62130, F25B 4902
Patent
active
049495500
ABSTRACT:
A monitor for a transport refrigeration unit in which the temperature of the air discharged by the unit into a load space is compared with the temperature of air returning to the unit, to provide a signal DI responsive to the algebraic difference. Signal DI, which represents the actual conditioning mode, is compared with a commanded conditioning mode signal provided by a thermostat associated with the transport refrigeration unit, and also with predetermined reference values, to detect incorrect operating modes, as well as significant loss of refrigerant capacity. Timers initiate resettable time delays in response to such detections, after which warning and shut-down signals are respectively provided when certain time delays are allowed to expire. Logic signals provided by the monitor are logically related when the monitor shuts the system down to drive diagnostic display which indicates the cause of shut down.
REFERENCES:
patent: 4045973 (1977-09-01), Anderson et al.
patent: 4211089 (1980-07-01), Mueller et al.
patent: 4325224 (1982-04-01), Howland
patent: 4387578 (1983-06-01), Paddock
patent: 4790143 (1988-12-01), Hanson
Lackey D. R.
Tanner Harry B.
Thermo King Corporation
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