46012 – EC MAX ECM BLOWER MOTOR (1/2 HP, 115/230V, 1075 RPM)

Packard EC Max electronically commutated direct-drive blower motor, 1/2 HP, 115/230 V dual voltage, 1075 RPM, 4 speeds. NEMA 48 frame, ball bearing, open air-over, and no run capacitor is required. Rotation is CW or CCW and is selected automatically on first start-up. Designed to replace PSC or X13 motors of equivalent horsepower in furnaces, air handlers and heat pumps.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• BrandPackard
• SeriesEC Max
• Part Number46012
• Motor TypeElectronically commutated (ECM)
• Horsepower1/2
• Voltage115/230 VAC
• Speed1075 RPM (6-pole)
• Amps6.7 A @ 115V / 4.0 A @ 230V
• DriveDirect drive blower
• RotationReversible

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• Mars 06107
• Mars 06207
• Mars 10589
• Mars 10590
• Mars 10861
• Genteq 3589
• Genteq 3590
• Packard 43589
• Packard 43590
• Century 6107E
• Century 6207E
• Century D1076
• Century DL1076
• Century EM3589
• Century EM3590
• Economaster EM3589
• Economaster EM3590
• US Motors 6640RS
• US Motors 6640TS
• US Motors 6641TS
• US Motors 8904
• US Motors 8905
• Fasco D728
• Fasco D729
• Wagner WG840589
• Wagner WG840590

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Is a 1075 RPM motor different from an 1100 RPM motor?

No. Both are 6-pole motors with a nominal speed of 1200 RPM, and the published number is just each manufacturer's rating convention. Anything in the 1050 to 1140 range is the same speed class. Pole count is what actually matters: 2-pole is nominal 3600 (published 3200 to 3450), 4-pole 1800 (1625 to 1750), 6-pole 1200 (1050 to 1140), 8-pole 900 (800 to 850). Swap a 6-pole for a 4-pole and you have a different motor entirely. Do not chase 25 RPM.

Can I put a PSC motor in place of an X13 or a variable-speed ECM?

Not as a straight drop-in. An X13 is a constant-torque motor that takes 24 volt signals on tap terminals instead of speed leads. A variable-speed ECM holds a target CFM by ramping against the static pressure it sees. A PSC has no idea what static pressure is, so you pick one speed tap and live with it. On a duct system pulling 0.8 inches water column of total external static, a PSC will not give you the airflow back. Genteq Evergreen style ECM replacements exist, but they still have to match frame, shaft and rotation.

What has to match besides horsepower?

Frame size, shaft diameter and length, rotation, mounting style, voltage and the run capacitor rating. A 48 frame motor is 5-1/2 inches across the body, a 42 frame is 5 inches. Keep amp draw within about 5 percent of the old nameplate, and never step horsepower DOWN.

Do I need a new capacitor with a PSC blower motor?

Yes. The new motor's nameplate tells you the microfarad it wants, and a weak capacitor is what killed a fair number of the motors that come across our counter.