Temperature control with undercool protection

Details Temperature control with undercool protection Temperature control with undercool protection

1980-09-08

1982-02-02

Wayner, William E.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62127, 165 11R, 165 26, F25B 4900, F25B 2900

Patent

active

043133088

ABSTRACT:
Electronic control apparatus is disclosed for automatically controlling the operation of refrigeration units on truck-drawn trailers which includes an undercool comparator (240) connected to a resistor (239) in a voltage divider including a temperature selector (13) and having its output in parallel with an overcool comparator (44), either of which will actuate a malfunction indicator (15) in the event of undercooling or overheating conditions during a chilled food setting for the temperature selector (13). An overcool comparator (91) that is turned on when the selector (13) is moved to a frozen food mode operates a control element in the form of a transistor (99) that serves to disable the output of overcool comparator (240) and prevent the actuation of the heat load device (23) by effecting grounding connections in the circuit.

REFERENCES:
patent: 4034570 (1977-07-01), Anderson et al.
patent: 4187093 (1980-02-01), Boratgis et al.
patent: 4240077 (1980-12-01), Hughes et al.

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