Armstrong 110116MF-301 H-52 LV Pump Less Volute

Medium-rise HVAC systems can evaluate the Armstrong 110116MF-301 H-52 LV less-volute assembly with 3/4 HP single-phase power, 115 or 208 to 230 V operation, a 5.25-inch impeller, alloy-steel shaft with bronze sleeve, and 225°F maximum operating temperature.

The universal sealed bearing arrangement and BUNA-N or stainless-steel seal materials provide specific replacement references. Since this is a less-volute assembly, the existing volute, shaft interface, coupler, and piping arrangement must be compatible before approval for boiler-plant circulation.

Key Features

- The 3/4 HP motor establishes the listed power class for HVAC replacement planning.
- Single-phase operation supports the documented electrical arrangement for compatible installations.
- 115 or 208 to 230 V operation requires confirmation of available supply voltage.
- The 5.25-inch impeller identifies the supplied rotating configuration for performance review.
- A universal sealed bearing arrangement supports replacement-part and service planning.
- An alloy-steel shaft with bronze sleeve provides the documented shaft construction.
- The 225°F temperature limit establishes a defined boundary for hydronic applications.

Hydraulic Performance and Application

The H-52 LV is listed for medium-rise HVAC systems and large residential boiler plants, with the 5.25-inch impeller identified for this assembly. Exact flow, head, NPSH, pressure, curve, and efficiency values are not supplied, so final selection requires matching the existing volute and system duty.

Installation Requirements

Verify 115 or 208 to 230 V power, single-phase wiring, existing volute compatibility, shaft and bronze-sleeve fitment, coupler alignment, seal material, fluid temperature below 225°F, rotation, and service clearance. The less-volute assembly should not be treated as complete without confirming the mating pump body.

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-sleeve, and seal condition should be included in service planning. Mulmotor can assist with product details and order-related questions.