Product Description
Armstrong S-25 Maintenance-Free Bronze-Fitted Circulator Pump
Part #174031MF-013 | S Series 3-Piece | 1/12 HP | 115V Single Phase
The Armstrong S-25 is a maintenance-free, three-piece in-line circulator with a cast iron, bronze-fitted body for closed hydronic heating and cooling and general HVAC service. A 1/12 HP, 115V motor turns at 1800 RPM, and permanently lubricated bearings never need oiling.
1/12 HPMotor
115VSingle Phase
1800 RPMMotor Speed
225°FMax Temp
175 PSIMax Pressure
Cast iron, bronze-fitted model for closed systems. For open systems, choose the all-bronze Armstrong S-25 (part #174031MF-043).
Benefits & Features
Long-term trouble-free operation
- Proven seal design from strong, long-lasting materials
- Sintered silicon carbide stationary seal face
- Cast iron volute with bronze fittings
Maintenance-free design
- Permanently lubricated bearings, no oiling required
- Stainless steel shaft
- flexible, 4-spring coupler
Reduced inventory cost
- Three-piece modular construction
- Universal replacement shaft and bearing module
- Fully serviceable for repeat overhauls and repairs
Easy, cost-effective servicing
- Back pull-out design for easy replacement of wear components
- Resilient-mounted motor
- Built-in thermal overload protection (single phase)
Specifications
| Manufacturer | Armstrong Fluid Technology |
|---|---|
| Model / Part Number | S-25 / 174031MF-013 |
| Series | S&H 3-Piece, maintenance free |
| Body Material | Cast Iron (Bronze Fitted) |
| System Type | Closed hydronic systems (cast iron body) |
| Motor | 1/12 HP, single phase, 1800 RPM, resilient mounted |
| Voltage / Frequency | 115V / 60 Hz |
| Flange Size Options (NPT) | 3/4", 1", 1-1/4", 1-1/2" (companion flanges sold separately) |
| Max Working Conditions | 175 PSI at 225°F (1206 kPa at 107°C) |
| Impeller | Polypropylene |
| Bearings | Maintenance free, permanently lubricated (stainless steel shaft) |
| Seal | Mechanical, sintered silicon carbide stationary face |
| Coupler | Flexible, 4-spring |
| Dimensions A × B × C | 13.75" × 6.50" × 11.50" (349 × 165 × 292 mm) |
| Weight | 19 lb (8.6 kg) |
Performance Curve & Dimensions
Performance curve (S Series)
Dimensional drawing (S Series)
Design & Submittals
- Series S Standard Circulators Submittal (PDF)
- S&H 3-Piece Circulators Solution Outline (PDF)
- S & H In-Line Circulators Typical Specification (DOC)
Warranty
Armstrong warrants its circulators against defects in material and workmanship for 30 months from the date of manufacture, when installed and used in accordance with Armstrong's printed instructions (normal wear and tear excepted).
Installation, Maintenance, Genuine Parts & Parts Kits
- In-Line Circulator Installation & Operating Instructions (PDF)
- Seal Bearing Assembly Replacement Instructions (PDF)
- Seal Bearing Assembly Product Information (PDF)
- Circulators Replacement Parts Brochure (PDF)
- Circulator Flange & Hardware Kits (PDF)
Always use genuine Armstrong parts, including the universal Seal Bearing Assembly, to keep your circulator performing to specification.
Please note: Companion flanges and hardware are sold separately. Not sure which flange kit or replacement parts you need? Contact Canadian Pump Shop and we'll help match them to your system.
