May God's grace bless you in the Lord Jesus Christ. When it was running yesterday I had 16 amps (20.5 - 4.5)on one leg and 9 amps (13.5 - 3.5)on the other. * The ECU already has two existing Electric Fan Outputs (not PWM) in Basic I/O - System Parameters. The initial readings (3.5 and 4.5 amps) were the freezer, lights, ceiling fans, etc. Client has committed to some envelope and insulation improvements. All that said, we are today merrily installing a 3 ton system on a house that loads out to 3.25 tons. (NOS 15620NOS Solid State Relay Instructions - See ) A 4 ton system typically supplies just 3 tons of sensible cooling, and loads in really hot places (such as Tucson) tend to be more sensible. It's rated at 40 amps and can operate at 100% duty cycle continuously or temporarily pulsing (PWM) high currents. Today I’m going to give you three reasons why your 3 ton air conditioner isn’t really a 3 ton air.
Thats why your 3-ton air conditioner is rarely producing 3 tons of cooling. Of course, you'd also need to program & wire sensor Inputs (A/C), in order for the ECU to control this Output the way you've described.įYI: Holley's 554-111 High Current Relay (device/solenoid driver) is not for use as a continuous duty pulsing relay. Air conditioner capacity depends on several factors: indoor temperature, indoor humidity, outdoor temperature, and more. However, all these Outputs are limited to 2 amps, so an appropriate electronic (solid state - PWM capable) controller is necessary.Ī PWM electronic controller is required, to convert the PWM signal (from the ECU), into variable voltage to the electrical component. The Holley HP ECU does have two programmable "PWM+" & "PWM−" Outputs (or two 12V & ground switched Outputs and four Inputs). I would like to program the HP ECU to vary the fan speed and increase fan speed with the A/C requested.