Method and apparatus for signal transmission in refrigeration un

Refrigeration – Processes – Defrosting or frost inhibiting

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62276, 236 51, F25D 2102

Patent

active

041832230

ABSTRACT:
A method and apparatus are disclosed for utilizing existing defrost heater conductors as a transmission medium for high frequency signals generated in response to selected control or alarm information. The signals are detected by a receiver connected to the heater conductors at a location remote from the evaporator coil and adjacent to the defrost heater power contactor. The detected signals are then routed to the various locations for selected control for alarm functions. Among such functions are providing remote readouts of temperature information from the refrigerator cooling section, providing alarm indications in the event of a malfunction within the cooling section resulting in over temperature, and energizing defrost heaters in response to accumulation of frost on the evaporator coil of the refrigeration system on a demand cycle defrost basis.

REFERENCES:
patent: 3222882 (1965-12-01), Sutton, Jr. et al.
patent: 3838411 (1974-09-01), Vander Meer
patent: 3903508 (1975-09-01), Taketa
patent: 3972471 (1976-08-01), Ziegler

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