초록 ▼

A defrost control system for the defrosting evaporators of a refrigeration system which utilizes a first timer which runs continuously and attempts to initiate evaporator defrost at predetermined times and a second timer which accumulates compressor operating time and prevents defrost initiation by

A defrost control system for the defrosting evaporators of a refrigeration system which utilizes a first timer which runs continuously and attempts to initiate evaporator defrost at predetermined times and a second timer which accumulates compressor operating time and prevents defrost initiation by the first timer at those preselected times until a predetermined period of operation of the refrigerating system has occurred.

대표청구항 ▼

An improved refrigerating system including conduit connected compressor, condenser and a frosting evaporator, said evaporator having a motor driven fan, defrost means capable of acting on the evaporator to defrost it, wherein the improvement comprises; cyclic means adapted to stop the fan and simult

An improved refrigerating system including conduit connected compressor, condenser and a frosting evaporator, said evaporator having a motor driven fan, defrost means capable of acting on the evaporator to defrost it, wherein the improvement comprises; cyclic means adapted to stop the fan and simultaneously attempt to initiate defrost at predetermined times blocking and unblocking means acting to allow the cyclic means to initiate defrost and prevent the cyclic means from initiating defrost, permissive means operative connected to the blocking and unblocking means and positioned to sense a condition related to the amount of frost on the evaporator, said permissive means causing the blocking and unblocking means to block initiation of defrost on a first value of the condition and causing the blocking and unblocking means to unblock initiation of defrost on a second value of the condition, said first value being related to the presence of a lesser amount of frost on the evaporator, and said second value being related to the presence of a greater amount of frost on the evaporator.