Monarch Industries BE-S50 Self Priming Effluent Pumps & Repair Parts
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Monarch BE-S50 1/2 HP Self-Priming Effluent Pump & Repair Parts
The Monarch BE-S50 is the versatile mid-range powerhouse of the renowned BE Series. Engineered for reliability and durability, this 1/2 HP self-priming effluent pump is capable of handling demanding wastewater applications with ease. With a dual voltage configuration (115/230V) and a rugged cast iron construction, the BE-S50 is the preferred choice for professionals managing septic systems, basement dewatering, and flood irrigation.
This unit (Order No. 621815) features a high-service factor motor (1.90 SF) and is designed for continuous duty. Whether you are installing a new system or repairing an existing unit, this page contains all necessary technical specifications, performance curves, and a complete list of genuine Monarch repair parts for both Type “TM” and Type “A” configurations.
Features and Benefits
- Powerful 1/2 HP Motor: CSA-approved, dual-compartment motor with a 1.90 Service Factor, significantly higher than NEMA standards.
- Self-Priming Design: Features a built-in check valve that facilitates fast priming and prevents syphoning, ensuring the pump is always ready for operation.
- Durable Construction: Heavy-duty cast iron casing and seal plate provide superior protection against wear and harsh environments.
- Corrosion Resistant: The semi-open gray cast iron impeller features a “Blind Hole” design to prevent liquid from contacting the stainless steel shaft.
- Versatile Voltage: Wired for 115V or 230V operation to suit various electrical setups.
- Mechanical Seal: High-quality Carbon/Ceramic 5/8″ mechanical seal ensures a leak-free life.
Applications
The BE-S50 is designed for a wide range of residential and commercial applications:
- Septic tank effluent pumping
- High-capacity sump drainage
- Excavation dewatering
- Livestock watering
- Flood irrigation
Technical Specifications
Ordering Information (BE Series)
| Model No. | Order No. | HP | SF | Ship Wt. (lbs.) | Voltage |
|---|---|---|---|---|---|
| BE-S33 | 621805 | 1/3 | 1.95 | 41 | 115 |
| BE-S50 | 621815 | 1/2 | 1.90 | 42 | 115/230 |
| BE-S75 | 621825 | 3/4 | 1.65 | 43 | 115/230 |
Electrical Data (BE-S50)
- Full Load Amps (115V): 12.4 Amps
- Full Load Amps (230V): 6.2 Amps
- Thermal Protection: Automatic thermal overload protection.
Performance Chart (Capacities in U.S. GPM)
| Model No. | Total Head in Feet | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | |
| BE-S33 | 36 | 30 | 23 | 16 | 9 | 2 | – | – | – |
| BE-S50 | 45 | 39 | 31 | 24 | 16 | 8 | – | – | – |
| BE-S75 | 58 | 53 | 44 | 36 | 29 | 18 | 10 | 1 | – |
Dimensions (Inches)
| Model | Suct. NPT | Disch. NPT | Priming Plug NPT | Drain Plug NPT | Slots | A | B | C | D | E | F | G | H | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BE-S33 | 1 1/4 | 1 1/4 | 1/2 | 1/2 | .43x.93 | 4.25 | 7.25 | 10 | 4.9 | 6.5 | 7.6 | 14.4 | 3.1 | 4.9 | 5.5 | 6.8 | 3 |
| BE-S50 | 1 1/4 | 1 1/4 | 1/2 | 1/2 | .43x.93 | 4.25 | 7.25 | 10 | 4.9 | 6.5 | 7.6 | 15.3 | 3.1 | 4.9 | 5.5 | 6.8 | 3 |
| BE-S75 | 1 1/4 | 1 1/4 | 1/2 | 1/2 | .43x.93 | 4.25 | 7.25 | 10 | 4.9 | 6.5 | 7.6 | 15.6 | 3.1 | 4.9 | 5.5 | 6.8 | 3 |
Repair Parts List – Type “TM”
| Ref. # | Code # | Qty. | Description | |
|---|---|---|---|---|
| BE-S33 | BE-S50 | |||
| 1 | 438391 | 1 | 1 | Casing |
| 2 | 438091 | 1 | Impeller | |
| 2 | 438101 | 1 | Impeller (BE-S50) | |
| 4 | 438245 | 1 | 1 | Mounting Bracket |
| 5 | 438241 | 1 | 1 | Seal Plate |
| 6 | 438412 | 1 | 1 | Flange |
| 7 | 201056 | 1 | 1 | Check Valve Assembly |
| 9 | 246800 | 1 | 1 | 5″ Edge Trim |
| 21 | 120030 | 4 | 4 | Bolt 3/8 UNC x 1 1/2 |
| 24 | 119780 | 2 | 2 | Bolt 5/16 UNC x 1 |
| 34 | 176540 | 4 | 4 | Spring Washer 3/8 |
| 35 | 174220 | 2 | 2 | Aluminum Washer |
| 38 | 185640 | 2 | 2 | Pipe Plug 1/2 NPT |
| 39* | 193920 | 1 | 1 | Gasket |
| 40* | 191790 | 1 | 1 | Flinger |
| 43 | 438413 | 1 | 1 | Gasket |
| 45 | 240104 | 1 | 1 | Seal 5/8 dia. |
| 50 | 204081 | 1 | 1/3 HP Electric Motor, Sq. Flange | |
| 1 | 1/2 HP Electric Motor, Sq. Flange | |||
Repair Parts List – Type “A”
Model Key for Table Below:
a= BE33 | b= BE-S33 | c= BE50 | d= BE-S50 | e= BE-S75
BE33-B | BE-S33-B | BE50-B | BE-S50-B | BE-S75-B
BE33-SP | BE-S33-SP | BE50-SP | BE-S50-SP | BE-S75-SP
| Ref. # | Code # | a | b | c | d | e | Description |
|---|---|---|---|---|---|---|---|
| 1 | 204070 | 1 | Motor 1/3 HP C face | ||||
| 1 | 204071 | 1 | Motor 1/3 HP Sq. flange | ||||
| 1 | 204110 | 1 | Motor 1/2 HP C face | ||||
| 1 | 204073 | 1 | Motor 1/2 HP Sq. flange | ||||
| 1 | 204125 | 1 | Motor 3/4 HP Sq. flange | ||||
| 2 | 246800 | 1 | 1 | 1 | 1 | 1 | Edge trim |
| 3 | 438245 | 1 | 1 | 1 | 1 | 1 | Base |
| 4 | 119990 | 4 | 4 | Bolt 3/8 UNC x 3/4 | |||
| 4 | 120030 | 4 | 4 | 4 | Bolt 3/8 UNC x 1 1/2 | ||
| 5 | 175500 | 4 | 4 | Aluminum washer | |||
| 5 | 176230 | 4 | 4 | 4 | Spring washer 3/8 | ||
| 6 | 191790 | 1 | 1 | 1 | 1 | 1 | Flinger |
| 7 | 438240 | 1 | 1 | Seal plate | |||
| 7 | 438241 | 1 | 1 | 1 | Seal plate | ||
| 8 | 240104 | 1 | 1 | 1 | 1 | 1 | Mechanical seal 5/8 I.D. |
| 9 | 438090 | 1 | Impeller 7/16 UNC; .20 vane height | ||||
| 9 | 438092 | 1 | Impeller 1/2 UNC; .20 vane height | ||||
| 9 | 438100 | 1 | Impeller 7/16 UNC; .30 vane height | ||||
| 9 | 438105 | 1 | Impeller 1/2 UNC; .25 vane height | ||||
| 9 | 438106 | 1 | Impeller 1/2 UNC ; .35 vane height | ||||
| 10 | 193920 | 1 | 1 | 1 | 1 | 1 | Gasket |
| 11 | 438390 | 1 | 1 | Casing | |||
| 11 | 438492 | 1 | 1 | 1 | Casing – yellow (B.C. dia. for motor – 7.13) | ||
| 12 | 227810 | 1 | 1 | 1 | 1 | 1 | Nut 1/4 UNC |
| 13 | 238330 | 1 | 1 | 1 | 1 | 1 | Top weight |
| 14 | 194390 | 1 | 1 | 1 | 1 | 1 | Checkvalve |
| 15 | 186540 | 2 | 2 | 2 | 2 | 2 | Pipe plug 1/2 NPT |
| 16 | 438415 | 1 | 1 | 1 | 1 | 1 | Checkvalve body |
| 18 | 174220 | 2 | 2 | 2 | 2 | 2 | Aluminum washer 5/16″ |
| 19 | 119780 | 2 | 2 | 2 | 2 | 2 | Bolt 5/16″ UNC x 1″ |
| 20 | 225720 | 1 | 1 | 1 | 1 | 1 | Bolt 1/4″ UNC x 5/8″ |
Models / Parts with Suffix “-B”
| Ref. # | Code # | Description |
|---|---|---|
| 633738 | 1 | Float switch |
| 435021 | 1 | Cord assembly 8 ft. |
Models / Parts with Suffix “-SP”
| Ref. # | Code # | Description |
|---|---|---|
| 225070 | 1 | Sump pump switch |
| 435021 | 1 | Cord assembly 8 ft. |
| 435022 | 1 | Cord assembly 5 ft. |
| 463763 | 1 | Float Kit |
FAQs
What is the voltage rating for the Monarch BE-S50?
The BE-S50 is a dual-voltage pump capable of operating on either 115V or 230V, making it highly adaptable for existing electrical installations.
What is the maximum discharge rate of the BE-S50?
At 20 feet of head, the BE-S50 can pump up to 45 U.S. Gallons Per Minute (GPM).
How do I know if I need Type TM or Type A repair parts for my BE-S50?
You must visually check the exploded view diagrams or the pump nameplate. Type TM generally refers to specific vintage models, while Type A has a slightly different casing and motor configuration. Refer to the diagrams above to identify your specific housing assembly.
Does the BE-S50 come with a check valve?
Yes, the BE-S50 features a built-in check valve. This ensures rapid priming and protects the pump from backflow and syphoning issues.