Monarch Industries BE-S50 Self Priming Effluent Water Pump
Monarch Industries BE-S50 Self Priming Water Pump and Repair Parts
Monarch Industries BE-S50 Self Priming Water Pump is a high-performance 1/2 HP self-priming effluent pump designed to tackle the toughest water transfer and drainage jobs. Built with a rugged cast iron housing and engineered for continuous duty, this pump is the industry standard for residential septic systems, basement dewatering, and flood irrigation.
Distinguished by its dual voltage capability of 115 and 230V and a high service factor of 1.90, the Monarch Industries BE-S50 Self Priming Water Pump, Order Number 621815, offers superior versatility and power compared to standard sump pumps. Whether you are pumping effluent from a septic tank or clearing water from a flooded construction site, the Monarch Industries BE-S50 delivers reliable performance with a maximum flow rate of 45 GPM.
Key Features
- Heavy-Duty Construction: Features a durable cast iron casing and seal plate, designed to withstand harsh environments and provide effective heat dissipation.
- Dual Voltage Motor: The 1/2 HP motor can be wired for either 115V or 230V, providing flexibility for various electrical installations.
- Self-Priming Design: Includes a built-in check valve that ensures fast priming and prevents syphoning, allowing the pump to start moving water immediately.
- Non-Clogging Impeller: The semi-open gray cast iron impeller utilizes a “Blind Hole” design to prevent liquid from contacting the stainless steel shaft, eliminating corrosion and thread stripping.
- Thermal Protection: Equipped with automatic thermal overload protection to prevent motor burnout during extended use.
- CSA Approved: Certified for safety and performance standards.
Common Applications
The Monarch BE-S50 is suitable for a wide range of applications, including:
- Septic tank effluent removal
- Flooded basement drainage
- Livestock watering
- Excavation dewatering
- General fluid transfer
Technical Specifications
Ordering Information
| 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 |
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-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 |
Repair Parts List – Type “TM”
| Ref. # | Code # | Qty. | Description | |
|---|---|---|---|---|
| BE-S33 | BE-S50 | |||
| 1 | 438391 | 1 | 1 | Casing |
| 2 | 438101 | 1 | Impeller | |
| 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. |
| 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 | 204110 | 1 | Motor 1/2 HP C face | ||||
| 1 | 204073 | 1 | Motor 1/2 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 | 438100 | 1 | Impeller 7/16 UNC; .30 vane height | ||||
| 9 | 438105 | 1 | Impeller 1/2 UNC; .25 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
Is the BE-S50 pump 115V or 230V?
The Monarch BE-S50 (1/2 HP) is a dual-voltage pump. It can be wired for either 115V or 230V depending on your installation requirements. At 115V it draws 12.4 amps, and at 230V it draws 6.2 amps.
Can I use the BE-S50 for septic effluent?
Yes, the BE-S50 is specifically designed as a self-priming effluent pump. It features a cast iron semi-open impeller that is ideal for moving effluent from septic tanks or dosing chambers.
What is the discharge size on the BE-S50?
The BE-S50 features a 1-1/4″ NPT discharge and suction port.
How do I order the correct repair impeller for the BE-S50?
It depends on the vintage of your pump (Type TM or Type A) and the motor flange type. For Type A models, check if you have a square flange or C-face motor. Reference the charts above; typically, Part #438105 is used for 1/2 HP square flange models, while #438100 is for C-face models.