Transport refrigeration system with top freezing avoidance

Details Transport refrigeration system with top freezing avoidance Transport refrigeration system with top freezing avoidance

1984-02-14

1985-05-28

Tanner, Harry

Refrigeration

Automatic control

Time or program actuator

62208, 622285, 62229, G05D 2319, F25B 100

Patent

active

045192154

ABSTRACT:
To reduce the probability of top freezing of a fresh cargo 12 in a trailer 10 served by a transport refrigeration unit 14, a control arrangement is provided including a sensor 18 controlling signals according to discharge air temperature fed to a first timer 20 which provides time periods according to the level of discharge air temperature, with shorter duration periods with lower discharge air temperatures, and when timer 20 times out effects actuation of relay 22 to reduce refrigerating capacity and start a duration timer 26 to maintain the reduced refrigeration capacity, with timer 26 functioning through a reset 28 to again start timer 20 when the duration timer has expired, and has caused the relay 22 to be operated to a position of normal refrigerating capacity.

REFERENCES:
patent: 2589031 (1952-03-01), Allyne
patent: 2923384 (1960-02-01), Black
patent: 2937510 (1960-05-01), Allyne
patent: 3443121 (1969-05-01), Weisbrod
patent: 3918269 (1975-11-01), Summers et al.
patent: 4292813 (1981-10-01), Paddock
patent: 4313308 (1982-02-01), Boratgis et al.

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