Press Release Summary:
Head Pressure Controllers sense refrigerant temperatures and modulate condenser fan speed to balance high to low side circuit vapor pressure. On start up, fan is given initial hard start at full speed for 10 seconds and then slows to speed to give required condensing temperature. As ambient temperatures fall further, fan gradually slows to about 1/3 full speed to maintain bearing lubrication and can be re-set to any desired level.
Original Press Release:
EDC International Introduces a New Energy Saving Product, Head Pressure Controllers for Air Conditioners and Heat Pumps
This state of the art controller is designed to cut energy costs of air conditioning and heat pump operation by adjusting the fan speed of the condenser. This is achieved by sensing the refrigerant temperatures (thereby pressure) to modulate the condenser fan speed to balance the high to low side circuit vapor pressure. This can significantly reduce the electrical consumption and increase the effective operation of the system. On start up the fan is given an initial hard start at full speed for 10 seconds and then slows to the speed to give the required condensing temperature. As ambient temperatures fall further the fan gradually slows to about 1/3 full speed to maintain bearing lubrication and can be re-set to any desired level.
The controllers for both heat pump and air conditioners combine the gradual fan variation of the standard range with fan cycling when air temperatures fall to even lower levels. Should the ambient temperatures continue to fall even lower these controllers will cycle the fan off until the condenser temperature rises again. The condenser will then start as usual with a hard start and modulate as necessary.