Armstrong 110116MF-300 H-51 LV Pump Less Volute

Commercial hydronic loops can evaluate the Armstrong 110116MF-300 H-51 LV less-volute assembly with 1/2 HP single-phase power, 115 or 208 to 230 V operation, 1,725 RPM speed, and a 5-inch impeller.

The maintenance-free sealed bearing assembly and standard carbon-ceramic mechanical seal provide defined replacement references. Compatibility with an existing Series 1050 or H-51 volute remains essential, because the less-volute format does not represent a complete standalone pump.

Construction and Service Details

- The 1/2 HP motor establishes the listed power class for hydronic replacement planning.
- Single-phase operation supports the documented electrical arrangement for compatible systems.
- 115 or 208 to 230 V operation requires supply-voltage confirmation.
- Operating at 1,725 RPM provides the rotating-speed reference for selection.
- A 5-inch impeller identifies the supplied hydraulic component for fitment review.
- The sealed bearing assembly reduces routine lubrication requirements during service.
- Carbon-ceramic sealing provides the documented mechanical-seal arrangement.

Hydraulic Performance and Application

The H-51 LV is listed for commercial heating systems and high-head hydronic loops. Exact flow, head, NPSH, pressure, temperature, curve, and efficiency values are not supplied, so the 5-inch impeller and 1,725 RPM speed cannot confirm hydraulic suitability without matching the existing volute and system duty.

Installation Requirements

Confirm 115 or 208 to 230 V power, single-phase wiring, existing H-51 or Series 1050 volute compatibility, 5-inch impeller clearance, shaft fitment, seal condition, rotation, and service access before installation. The less-volute assembly must match the existing pump body and piping arrangement.

Warranty and Maintenance

Armstrong provides a 30-Month Limited Warranty from date of manufacture for circulators, covering material and workmanship defects under normal use and service. Improper installation, maintenance, misuse, alteration, negligence, abnormal additives, and normal wear are excluded. Bearing, shaft, impeller, and seal condition should be reviewed during service. Mulmotor provides product-information support before purchase.