Microcomputer control for an inverter-driven heat pump

A refrigeration system for conditioning a space and having a closed refrigerant circuit including a compressor, a condenser, an expansion device, and an evaporator connected respectively in series, said system comprising:

• first sensing means for measuring the actual temperature of a space to be conditioned and generating an electrical signal representative of the measured temperature;
• means for setting a reference temperature of the space to be conditioned and generating a second electrical signal representative of the reference temperature;
• second sensing means for measuring the relative humidity and generating a third electrical signal representative of the reference temperature;
• evaporator fan motor for driving a fan to direct air into the conditioned space;
• first motor speed control means connectable to said evaporator fan motor for controlling continuously and discretely the speed thereof:
• compressor motor for driving the compressor;
• second motor speed control means connectable to said compressor motor for controlling continuously and discretely the speed thereof;
• programmed control means for generating a first digital signal responsive to said measured temperature and said reference temperature to drive said first motor speed control means and a second digital signal which is a function of said first digital signal and said relative humidity to drive said second motor speed control means;
• and
• data processor means having a program coupled to said programmed control means for controlling the operation thereof to affect a measured temperature and relative humidity of the conditioned space.