An apparatus and method for defrosting an evaporator of a refrigeration
sealed system is described. The system includes a controller operatively
coupled to an evaporator fan, a condenser fan and a defrost heater, and
the method includes operating the sealed system until a selected time till
defrost interval expires, initiating a defrost cycle when the time till
defrost interval expires, and selectively operating the sealed system to
raise a temperature of the evaporator while the defrost heater is
inactivated.
