Building automation and controls. Solved.
Functional Devices' Model EFC4045T-208 is an Enclosed Two Speed ECM / Shaded Pole Motor Phase Controller with Temperature Differential Input, 208 Vac Input for Use in Walk-In Coolers.
Example Calculation of Energy Savings
|Compressor Off Cycle: 75%||Hours per year: 8760 hours||Compressor Off Time per year: 6570 hours|
|Typical Cost of Power: $0.10/kWh**||Power Consumption @ Low Speed: 0.036 kW||Power Consumption @ Normal Speed: 0.209 kW|
Measured Values for Two Shaded Pole Motors in One Unit*
(Power Consumption @ Normal Speed - Power Consumption @ Low Speed) x (Compressor Off Time per year) x (Typical Cost of Power) = (0.209 kW - 0.036 kW) x (6570 hours/year) ($0.10/kWh) =
$113.66/year per Evaporator Fan Unit
*Actual measurement from test site. Your measurements may vary.
**Average U.S. price of electricity as reported by the U.S. Energy Information Administration, July 2010.