초록 ▼

A control for selectively energizing a plurality of electrically operable devices in a refrigeration apparatus. The control senses an ambient condition and correspondingly controls the energization of the electrical devices. In the disclosed embodiment, the electrical devices comprise stile and mull

A control for selectively energizing a plurality of electrically operable devices in a refrigeration apparatus. The control senses an ambient condition and correspondingly controls the energization of the electrical devices. In the disclosed embodiment, the electrical devices comprise stile and mullion heaters for controlling condensation on the refrigeration unit cabinet with the control being responsive to the ambient humidity conditions in effecting control of the energization of the heaters. The control is arranged to selectively energize both heaters with full operating current, or only one of the heaters and at reduced current, depending on the sensed humidity and temperature conditions. In the illustrated embodiment, the control utilizes rectifiers in effecting the current control with one of the rectifiers being a gated rectifier responsive to the sensed ambient air conditions.

대표청구항 ▼

In an apparatus having a cabinet with a refrigerated enclosure, and electrical heater means for preventing water condensation on the cabinet from ambient air surrounding the cabinet, control means for automatically controlling said heater means as a function of a condition of said ambient air, said

In an apparatus having a cabinet with a refrigerated enclosure, and electrical heater means for preventing water condensation on the cabinet from ambient air surrounding the cabinet, control means for automatically controlling said heater means as a function of a condition of said ambient air, said control means comprising: power circuit means for providing electrical power to said heater means, said power circuit means providing a preselected full power to said heater means in a first state and a preselected partial power to said heater means in a second state; means for sensing said condition of the ambient air; and circuit means responsive to said sensing means for placing said power circuit means at all times selectively in one or the other of said first and second states as a function of said sensed ambient air condition.