General HVAC circulation needs Armstrong 4380 for pressure boosting, commercial boiler feed, and large hydronic distribution. This 10 HP three-phase close-coupled pump uses a 4 x 4 x 6 configuration, ductile iron body, inside single mechanical seal, and maximum 6-inch impeller diameter. Confirm the 250°F temperature limit, 175 PSI pressure rating, motor data, and system curve before startup.

The Armstrong Series 4380 uses a close-coupled design with the motor shaft extending into the pump and a full or trimmed impeller. Its self-venting back pull-out configuration supports service planning, while the three-phase motor requires verified voltage, phase rotation, overload settings, and conductor sizing. Verified data does not include GPM, maximum head, amp draw, seal material, dimensions, weight, thermal protection, or self-priming capability.

Key Features of Armstrong 4380 10 HP

- 10 HP motor supports commercial HVAC circulation and pressure-boosting applications.
- Three-phase configuration suits large commercial electrical distribution and motor controls.
- 4 x 4 x 6 pump size identifies the specified hydraulic arrangement.
- Full or trimmed impeller supports application-specific hydraulic curve selection.
- Ductile iron body provides a rigid housing for commercial water circulation.
- Inside single mechanical seal supports fluid containment under approved conditions.
- Self-venting back pull-out design supports service access around connected piping.
- 175 PSI standard pressure rating supports compatible commercial hydronic systems.
- 250°F maximum operating temperature supports approved high-temperature HVAC and boiler applications.

Why Choose Armstrong 4380 10 HP

This Armstrong close-coupled pump combines ductile iron construction, back pull-out service access, and high-capacity commercial operation.

- Build: Ductile iron, close-coupled construction, and self-venting back pull-out design support commercial installation.
- Value: Service access around connected piping can reduce maintenance labor and equipment downtime.
- Audience: Commercial HVAC contractors, boiler-feed installers, pressure-boosting specialists, facility engineers, and municipal water teams can specify this model.

Applications & Use Cases

Use the Armstrong 4380 10 HP for general HVAC circulation, pressure boosting, commercial boiler feed, and large hydronic distribution. The supplied 4 x 4 x 6 pump size supports layout planning, while unit weight and port reach were not provided, so verify flange spacing, valve clearance, motor access, lifting room, and pipe support before installation.

Warranty & Support

- Warranty: Armstrong USA general terms provide 12 months from installation, not exceeding 18 months from shipment, for applicable non-E.2 products.
- Confirm motor voltage, phase rotation, pressure rating, purge air, seal condition, and back pull-out clearance during commissioning.

Flush debris, inspect the mechanical seal, verify operating temperature, and monitor the ductile iron casing during scheduled service. Purchase the Armstrong 4380 10 HP close-coupled vertical in-line pump from Mulmotor.com for authentic equipment, applicable factory warranty protection, and pump support.