Transport refrigeration unit defrost control system

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

F - Mech Eng,Light,Heat,Weapons

25

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F25D 21/06 (2006.01) F25B 47/00 (2006.01) F25D 21/00 (2006.01) F25D 21/12 (2006.01)

Patent

CA 1267951

16 52,319 ABSTRACT OF THE DISCLOSURE A solid-state defrost timer control for a trans- port 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 tempera- ture is less than a pre-established temperature and will retain and hold time when the coil temperature is above the pre-established temperature.

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