Transport refrigeration unit defrost control system

Details Transport refrigeration unit defrost control system Transport refrigeration unit defrost control system

1986-01-24

1987-03-03

Tanner, Harry

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62126, 62162, 62140, F25D 2106

Patent

active

046465294

ABSTRACT:
A solid-state defrost timer control for a transport refrigeration unit includes an oscillator 68, counter 66, flip-flop 74, and termination timer 88 which are provided with temperature reference signals from comparator U1, sensor failure condition signals from comparators U2 and U3, manual defrost and air switch defrost signals from switches S1 and S2, temperature set point signals from temperature set point device 42 and unit drive signals from line 64. Among the operating features are that the device will accumulate time only when the evaporator coil temperature is less than a pre-established temperature and will retain and hold time when the coil temperature is above the pre-established temperature.

REFERENCES:
patent: 2709345 (1955-05-01), Ramsey
patent: 4156350 (1979-05-01), Elliott et al.
patent: 4299095 (1981-11-01), Cassarino
patent: 4302947 (1981-12-01), Mueller et al.
patent: 4381549 (1983-04-01), Stamp, Jr. et al.
patent: 4406133 (1983-09-01), Saunders et al.
patent: 4407138 (1983-10-01), Mueller
patent: 4432210 (1984-02-01), Saito

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