Patent ID: 6067809
Filing Date: 2000-05-30
Classification: F25B,F25D

Abstract:
A control circuit for supplying current from an electrical power source to a damper motor and evaporator fan motor of a two compartment refrigeration unit to control operation of the damper motor and evaporator fan motor, the damper motor opening and closing a damper door between first and second refrigeration compartments, the control circuit comprisinga first thermostatic switch adapted to regulate temperature in the first refrigeration compartment, the first thermostatic switch being connected to the electrical power source and providing an electrical path therethrough in response to an increase in temperature in the first compartment;a second thermostatic switch adapted to regulate temperature in the second refrigeration compartment, the second thermostatic switch being connected to the electrical power source and providing first and second electrical paths therethrough in response a respective increase and decrease in temperature in the second compartment;a first mechanically actuated switch havinga first common contact electrically connected to the damper motor,a first contact electrically connected to the second thermostatic switch and connecting the damper motor to the power source in response to a decrease in temperature in the second compartment, anda second contact electrically connected to the second thermostatic switch and connecting the damper motor to the power source in response to an increase in temperature in the second compartment; anda second mechanically actuated switch havinga second common contact electrically connected to the evaporator fan motor,a third contact electrically connected to the first thermostatic switch and electrically connecting the evaporator fan motor to the power source in response to an increase in temperature of the first compartment, anda fourth contact electrically connected to the second thermostatic switch and electrically connecting the power source to the evaporator fan motor in response to an increase in temperature of the second compartment.