Stile and mullion heater control

Abstract

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.

Dependencies are inferred from the claim text.