Most residential misting systems are designed for 1 Phase power because that is typically the only available power supply. However, some commercial and most industrial applications do have the option of using 1 Phase or 3 Phase power. The question becomes: which is a better option?
In terms of the actual performance of the mist system (its cooling or humidification capability), there is no difference between one that uses 1 Phase and one that uses 3 Phase. The real issue becomes the longevity of the motor and the efficiency of the misting system’s operation.
3 Phase Motors
Generally speaking, 3 Phase motors:
- Run cooler
- Have a higher efficiency rating (they are more efficient to operate)
- Have a lower amp draw (FLA)
- Have a higher Service Factor (SF)
- Are more reliable for continuous duty applications
- Are more forgiving when it comes to mist systems that are designed to cycle on and off on a regular basis (3 Phase motors are suitable for up to 20 starts per hour while 1 Phase motors are only suitable for less than 10 starts per hour).
A Direct Comparison
Specifically, here is a direct comparison for two generic motors. Both are 2 HP, 4 pole motors (running at 1750 RPM) operating at 230V 60Hz.
Phase 1 3
FLA 10.2 6.2
Efficiency 75.5 80
Power Factor 65 78
Insulation B F
Service Factor 1.15 1.25
Cost Basis $733 $517
In this example, the 3 Phase motor has approximately 40% lower amp draw, an improved power factor, and a higher insulation rating allowing it to safely operate at a higher temperature (B insulation rated at 266 degrees Fahrenheit while F insulation is rated for up to 311 degrees Fahrenheit). It also has a higher Service Factor — which relates to the capability of the motor to operate at horsepower requirement above that stated on the motor nameplate — and has a lower cost basis.
Although this information is based on two specific motors, the results will be similar when comparing most 1 Phase motors to 3 Phase motor options. Based on these differences, the bottom line is if 3 Phase power is available, 9 times out of 10, a 3 Phase motor is the preferred option.
Which Type of Pump Motor Do You Need?
Conditions may vary so it is recommended that you reach out to the Fogco Customer Service team to get a quote based on your site conditions and your specific mist system requirements.