1. Product Overview
The Armstrong S-25 Lead-Free Bronze 174031MF-043 is an in-line circulator pump designed for domestic hot water systems. This model features a robust three-piece design, including a radially-split body, an oversized stainless steel shaft, a balanced centrifugal impeller, and a positive mechanical seal. It is engineered for durability and ease of maintenance, complying with lead-free standards.
Figure 1: Armstrong S-25 Lead-Free Bronze Circulator Pump. This image shows the compact design of the circulator pump, highlighting its bronze construction and in-line configuration.
Key Features:
- Maintenance-Free Design: Permanently lubricated ball bearings eliminate the need for regular maintenance.
- Radially-Split Body: Allows for servicing the pump without disconnecting the piping.
- Oversized Stainless Steel Shaft: Ensures long-term durability and reliable performance.
- Balanced Centrifugal Impeller: Optimizes water delivery within the HVAC system.
- Proven Seal Design: Constructed from strong, long-lasting materials for extended operational life.
- Modular Construction: Three-piece design with back pull-out for easy replacement of wear components.
- Lead-Free Compliance: Certified to meet lead-free standards (≤ 0.25 weighted average percent lead) and complies with California Health and Safety Code Section 116875 (AB1953).
2. Setup and Installation
Proper installation is crucial for the optimal performance and longevity of your Armstrong S-25 circulator pump. It is recommended that installation be performed by a qualified professional.
Safety Precautions:
- Ensure the power supply is disconnected before beginning any installation or maintenance.
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Verify that the pump's voltage and electrical requirements match your system's specifications (115 Volts).
Installation Steps:
- Mounting: The pump is designed for in-line installation. Ensure it is securely mounted to prevent vibration and stress on piping. The installation method is typically floor-mounted.
- Piping Connection: Connect the pump to the system piping. Note that flanges are sold separately. Refer to the product documentation for compatible flange options (e.g., 116013-841, 116012-841, 116011-841, 116009-841). Ensure all connections are watertight.
- Electrical Wiring: Connect the pump to a dedicated electrical circuit according to local electrical codes. The pump operates on 115 Volts AC/DC. Consult a licensed electrician if unsure.
- System Filling and Purging: After installation, fill the system with water and thoroughly purge all air to prevent cavitation and ensure efficient operation.
3. Operating Instructions
Once installed and the system is filled and purged, the Armstrong S-25 circulator pump is ready for operation.
Starting the Pump:
- Ensure all valves in the system are open to allow proper water flow.
- Restore power to the pump's electrical circuit.
- The pump should start circulating water. Listen for any unusual noises, which may indicate air in the system or an obstruction.
Normal Operation:
- The pump is designed for continuous operation in domestic hot water systems.
- Monitor system pressure and temperature to ensure they remain within safe operating limits.
- The maximum flow rate is 31 Gallons Per Minute.
Stopping the Pump:
To stop the pump, simply disconnect the power supply to its circuit. For extended shutdowns, it is advisable to drain the system to prevent freezing or stagnation.
4. Maintenance
The Armstrong S-25 circulator pump is designed for maintenance-free operation, featuring permanently lubricated ball bearings. This significantly reduces the need for routine servicing. However, periodic checks are recommended to ensure optimal performance and longevity.
Recommended Checks:
- Visual Inspection: Periodically inspect the pump for any signs of leaks, corrosion, or unusual wear.
- Noise and Vibration: Listen for any abnormal noises or excessive vibration during operation, which could indicate an issue.
- System Pressure: Ensure the system pressure is maintained within the manufacturer's recommended range.
- Component Replacement: While the pump is designed for durability, wear components can be replaced if necessary due to its modular construction and back pull-out design. Refer to Armstrong's official service guides for detailed instructions on component replacement.
For any servicing that requires opening the pump, ensure the power is disconnected and the system is drained. The radially-split body allows for servicing the pump without removing it from the piping.
5. Troubleshooting
This section provides guidance for common issues you might encounter with your circulator pump. Always disconnect power before attempting any inspection or repair.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump does not start | No power; tripped circuit breaker; faulty wiring; seized motor. | Check power supply and circuit breaker. Verify wiring connections. If motor is seized, professional service may be required. |
| Pump runs but no flow or low flow | Air in system; closed valves; clogged impeller; incorrect rotation. | Purge air from the system. Ensure all isolation valves are open. Inspect impeller for obstructions. Verify correct motor rotation (if applicable). |
| Excessive noise or vibration | Air in system; cavitation; loose mounting; worn bearings; foreign object in pump. | Purge air. Check for proper system pressure to prevent cavitation. Tighten mounting bolts. If bearings are worn or foreign object present, professional service is recommended. |
| Leaking from pump | Loose connections; worn mechanical seal; cracked casing. | Tighten pipe connections. Inspect and replace mechanical seal if worn. A cracked casing requires pump replacement. |
If troubleshooting steps do not resolve the issue, contact Armstrong customer support or a qualified HVAC professional.
6. Specifications
Detailed technical specifications for the Armstrong S-25 Lead-Free Bronze 174031MF-043 Circulator Pump.
| Model Number | 174031MF-043 |
| Brand | ARMSTRONG |
| Material | Bronze |
| Color | Bronze |
| Power Source | AC/DC |
| Voltage | 115 Volts |
| Horsepower | 1.5 Horsepower |
| Maximum Flow Rate | 31 Gallons Per Minute |
| Item Weight | 8 pounds |
| Product Dimensions | 8.3 x 5.4 x 5.6 inches |
| Installation Method | Floor |
| Lead-Free Compliance | Certified ≤ 0.25 weighted average percent lead; Complies with California Health and Safety Code Section 116875 (AB1953) |
| UPC | 672807424633 |
7. Warranty and Support
For detailed warranty information, please refer to the official Armstrong manufacturer's website or the documentation included with your purchase.
For technical support, replacement parts, or further assistance, please contact Armstrong customer service directly. Contact information can typically be found on the manufacturer's official website or on the product packaging.
