Motor, Century, 2.0 Horsepower, 230v, 2 Speed, 48 Frame | BN51

💧 Motor, Century, 2.0 Horsepower, 230v, 2 Speed, 48 Frame

Made by Century, manufacturer part number BN51. It is listed for the equipment shown below, so check the model on your own unit against that list.

IMPORTANT: This motor may be received from the manufacturer with or without a capacitor attached.

• 12 & 3 O’clock Conduit Entries
• 40°C Ambient • Class B Insulation
• Rotation: CCW Pump End
• Through Bolt Mount
• 48/56 Base Mounting
• 3-1/2” Shaft Height
• Four Thru Bolts on a 5.146 Bolt Circle

✅ Listed for

• Balboa Water Group Dura-Jet DJ Series Pumps
• JCM K KM Series Pumps Jacuzzi J
• LC LCUN2 LT LX LTC LCU LTCU LCM ULCU ULTCU Jacuzzi L
• Jacuzzi Piranha “A” Pump
• Pentair American Products Maxim Pump
• Pentair PacFab Dynamo Pump
• Acura Spa Magnaflow Pump
• Acura Spa Aquaheat Pump – 1-1/2″ suction / 1-1/2″ Discharge
• Acura Spa Aquaheat Pump Plus – 2″ suction / 2″ Discharge
• Waterway HiFlo & HiFlo II Series Pump Replacement Parts
• Waterway Center Discharge Pool Pump (4 Screw Faceplace)
• Waterway Center Discharge Spa Pump (4 Screw Faceplate)
• Waterway Executive 48 Frame Parts & Wetends
• Waterway EX2 Spa Pump 48-Frame & 56-Frame
• Waterway Spa Flo/Iron Might 48-Frame Pump
• Waterway Supreme 48-Frame Above Ground Pump
• Waterway Workman 48-Frame Above Ground Pump
• Waterway E-Series Wet End (6 Screw Faceplate)
• Gecko Aqua Flo Flo-Master XP2 48-Frame
• Gecko Aqua Flo Flo-Master FMHP/FMCP Series Spa Pump
• Aqua Flo Tub-Master TMCP Series 100% Drain Bathtub Pump
• Gecko Aqua Flo Flo-Master XP2E 48-Frame
• Gecko Aqua Flo Flo-Master XP 48-Frame
• Vico UltraFlo Pumps
• Center/Side Discharge 48 Frame Balboa Vico Ultima Series

IMPORTANT: This motor may be received from the manufacturer with or without a capacitor&nbspattached. If the capacitor plays a role in your installation please contact our Sales Team for verification.

HP	Volts	Amps	SF
2.0	230	2.6/10.5	1.00

• 12 & 3 O’clock Conduit Entries
• 40°C Ambient • Class B Insulation
• Rotation: CCW Pump End
• Through Bolt Mount
• 48/56 Base Mounting
• 3-1/2” Shaft Height
• Four Thru Bolts on a 5.146 Bolt Circle

Century replacement spa pump motor – 2 HP, 230V, two speed, 48Y frame

⚙️ What this motor is

This is a replacement motor only, not a complete pump. It is a thru-bolt motor, which you can recognise by feet underneath and four long bolts that pass right through the motor into the wet end. It is a 48Y frame with a threaded shaft. It runs on 230V, two speed. It bolts to the wet end you already have, so the pump housing, impeller and plumbing stay where they are.

✅ Check these before you order

• Compare total horsepower, not nameplate horsepower. Multiply the horsepower on your old motor’s label by the service factor next to it, and compare that figure. This motor is rated 2 HP.
• Mounting. Thru-bolt motors suit spa, jetted tub and above-ground pump wet ends, and do not fit square flange pumps, so check yours matches before ordering.
• Frame size. Measure between the thru-bolt holes: about 3-5/8 inches apart is a 48 frame, about 4-1/8 inches is a 56 frame. Measuring beats reading the old label, because some makers labelled 48 frame motors as 56. This one is a 48Y frame.
• Shaft. This motor has a threaded shaft. A threaded shaft has the impeller screwed straight onto it; a keyed shaft is smooth with a groove down it. The two are not interchangeable.
• Voltage. This motor is 230V. Read it off the old motor’s label rather than assuming from the wiring – a spa wired for 240V can still run a 120V pump.

🔧 When you fit it

• Fit a new shaft seal at the same time. A failed shaft seal lets water into the motor and is the most common reason a motor dies. Reusing the old one on a new motor is the quickest way to ruin it.
• Rotation. Pool and spa motors turn counter-clockwise seen from the shaft end, shown on the label as CCW or CCWPE. They cannot be reversed by swapping wires, so check the old label if it says anything different.
• Keep the horsepower the same unless you are changing the impeller too – the impeller is matched to the motor’s output.

🔩 Technical specifications

🔧 Parts and fittings for this