METHOD AND APPARATUS FOR REMOVING ICE FROM OUTDOOR HOUSING FOR AN ENVIRONMENTAL CONDITIONING UNIT

摘要

A method for removing ice from an outdoor housing for an environmental conditioning unit that includes the housing surrounding a coil and a fan for moving air past the coil includes the steps of: (a) operating the fan at a first speed in a first direction to move air in a first flow past the coil while the conditioning unit is in a heating mode; (b) disengaging the fan when the conditioning unit is in a defrost mode; (c) operating the fan at a second speed in a second direction to move air in a second flow past the coil when an operational parameter attains a first value; and (d) operating the fan in the first direction at the first speed to move air in the first flow when the operational parameter attains a second value.