Product Overview
Built for demanding commercial and industrial applications, the Armstrong 410135-240 circulating pump delivers robust performance and exceptional durability. This heavy-duty circulator features a bronze impeller and rugged construction designed to handle continuous operation in large-scale HVAC systems, industrial processes, and commercial plumbing applications. Its proven design ensures reliable fluid movement where system failure is not an option.
The pump combines efficient hydraulic performance with service-friendly features, including a removable end cover and replaceable mechanical seal. The bronze impeller provides superior corrosion resistance compared to standard materials, extending service life in challenging water conditions. With its balanced design and heavy-duty motor, this circulator operates quietly while moving significant water volumes in multi-story buildings, manufacturing facilities, and institutional campuses. For system design guidance, read our blog on [Selecting Commercial Circulating Pumps for Large-Scale Applications].
As part of Armstrong’s respected 707S series, this pump continues a legacy of industrial-grade performance that mechanical engineers and facility managers have trusted for decades. Whether maintaining critical process temperatures or ensuring consistent water circulation in a high-rise building, the 410135-240 provides the reliability needed for 24/7 operation. Learn about its role in modern building systems in our article [The Critical Role of Circulating Pumps in Commercial HVAC Efficiency].
Technical Specifications
| Specification | Details |
|---|---|
| Model | Armstrong 410135-240 (707S Series) |
| Motor Power | 1/2 HP (0.37 kW) |
| Connection Size | 1-1/4″ FIPT x 1-1/4″ FIPT |
| Impeller Material | Bronze |
| Housing Material | Cast Iron |
| Max Head | 28 ft (8.5 m) |
| Max Flow | 85 US gpm (322 L/min) |
| Speed Settings | Single Speed |
| Max Operating Pressure | 125 psi (8.6 bar) |
| Max Fluid Temperature | 230°F (110°C) |
| Voltage | 115V, 1-Phase |
| Shaft Seal | Replaceable Mechanical Seal |
| Motor Type | PSC (Permanent Split Capacitor) |
Comparison Table: Armstrong 707S vs. Alternative Commercial Pumps
| Feature | Armstrong 410135-240 | Competitor A (Light Commercial) | Competitor B (Industrial Grade) |
|---|---|---|---|
| Construction | Heavy-Duty Cast Iron/Bronze | Lightweight Construction | Industrial Cast Iron |
| Serviceability | Excellent (Removable End Cover) | Limited Service Access | Full Service Access |
| Impeller Material | Bronze (Corrosion Resistant) | Composite or Cast Iron | Bronze or Stainless Steel |
| Application Range | Commercial HVAC & Plumbing | Residential/Light Commercial | Heavy Industrial |
| Price Point | Mid-Range Commercial | Economy | Premium |
| Motor Quality | Commercial Duty PSC | Standard Residential | Industrial TEFC |
Frequently Asked Questions (FAQs)
Q1: What applications is this pump best suited for?
The 410135-240 excels in commercial building HVAC systems, industrial process circulation, large domestic water recirculation systems, and institutional applications like schools and hospitals where reliable, continuous operation is essential.
Q2: What maintenance does this commercial circulator require?
Routine maintenance includes periodic inspection of the mechanical seal for leaks, motor bearing lubrication (if specified), and ensuring the pump operates within its performance curve. The removable end cover simplifies seal replacement when needed.
Q3: Can this pump handle both heating and chilled water applications?
Yes, the pump is designed for closed-loop hydronic systems operating with water or glycol solutions within its published temperature and pressure ratings. It performs effectively in both heating systems up to 230°F and chilled water systems.
Q4: Is the bronze impeller suitable for potable water applications?
While the bronze impeller provides good corrosion resistance, the cast iron housing makes this pump unsuitable for potable water systems. For domestic water applications, consider Armstrong’s [All-Bronze Circulator Series] with completely bronze wetted parts.
Q5: What is the expected service life of this pump?
With proper installation and maintenance, the 410135-240 typically provides 15-20 years of reliable service in commercial applications. The bronze impeller significantly extends service life compared to all-cast iron designs in corrosive water conditions.
Pros and Cons
| Pros | Cons |
|---|---|
| Durable Construction with commercial-grade components | Cast Iron Housing limits potable water use |
| Bronze Impeller for enhanced corrosion resistance | Single-Speed Operation limits energy efficiency |
| Easy Serviceability with removable end cover | Heavier Weight requires proper pipe support |
| Proven Reliability in commercial applications | Periodic Maintenance required (seal inspection) |
| Quiet Operation with balanced rotating assembly | Not Self-Priming – requires flooded suction |
| Wide Availability of replacement parts | Standard Efficiency vs. modern ECM pumps |
Conclusion & Ideal Use Cases
The Armstrong 410135-240 circulating pump represents the workhorse standard for commercial hydronic systems where reliability, serviceability, and long-term performance outweigh the need for advanced features like variable speed control. Its balanced design and quality construction make it a cost-effective choice for many commercial and industrial applications.
This pump is ideally specified for:
-
Commercial HVAC Systems: Secondary loop circulation in office buildings and retail spaces
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Industrial Processes: Cooling tower circulation, process temperature control
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Institutional Buildings: School, hospital, and government facility hydronic systems
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Large Residential Buildings: Apartment and condominium heating system circulation
For applications requiring higher efficiency, consider Armstrong’s [ECM High-Efficiency Circulator Series], while for potable water systems, the [Armstrong All-Bronze Circulator Line] is the appropriate choice. The 410135-240 fills an important niche for standard-efficiency commercial applications where proven reliability and easy maintenance are paramount. For performance data and installation guidelines, consult the Armstrong Product Engineering Manual (External Link).
Contact our commercial pump specialists today for application assistance, performance curve analysis, and competitive pricing on this reliable workhorse circulator.
