Design Envelope 4280 Close-Coupled Horizontal End Suction Pumps

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Design Envelope 4280 Close-Coupled Horizontal End Suction Pumps

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Design Envelope 4280 Close-Coupled Horizontal End Suction Pumps - Isometric view
Design Envelope 4280 Close-Coupled Horizontal End Suction Pumps - Line drawing

  • Summary
  • Applications

    HVAC-system pumping; general purpose pumping; industrial/process pumping (water or glycol based)

  • Description

    Motor-mounted pump unit with integrated intelligent controls for space-saving installation and superior energy performance. Saves up to 75% in energy over comparable traditional constant speed or variable frequency operated pump installations

  • Materials
    • Cast iron or ductile iron casing
    • Bronze impeller
    • Sintered silicon carbide mechanical seal
  • Configuration

    On-board Intelligent Variable Speed controls with Sensorless control. Controls enclosure UL type 12 for indoor applications. Supplied with NEMA premium motor for significant reductions in energy usage.

  • Performance range

    Up to 1000 USgpm (63 L/s) flow; up to125 ft (38 m) head

  • Temperature

    250oF (121oC)

  • Power Range

    1 hp to 7.5 hp (0.75 kW to 5.5 kW)

  • Size

    1.5" to 6” (40 mm to 150 mm)

Lowest installed cost

  • Integrated intelligent controls eliminate procurement, installation (incl. wiring), calibration and upkeep of differential pressure sensors
  • Superior energy performance qualifies for significant cost recovery under utility and government rebate programs
  • Design Envelope selections frequently recommend a smaller motor and/or pump which reduces installed cost
Design Envelope

Lowest installed cost. Lowest operating cost.


Lowest operating cost

  • Patented selection software ensures Design Envelope pumps are ranked on cost and 3-yrs of operating cost for a 50% average load profile
  • Sensorless Control, available in Design Envelope controllers, operates on the best operating curve for optimum system energy use
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Lowest environmental cost

  • 75% decrease in energy consumption reduces operational greenhouse gas emissions at equal ratio
  • Equipment downsizing mitigates environmental impacts associated with procuring unnecessarily large equipment



Lowest project and operating risk

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U.S.A. Utility Energy Rebate Info.

Design Envelope Pumps - solution outline

Design Envelope single-phase power supplement

Design Envelope Horizontal Pump supplement

Armstrong Design Envelope - FAQs

Armstrong Horizontal Design Envelope - FAQs

Armstrong Design Envelope Generation 3 - FAQs

Variable frequency drives and the use of bypasses - fact sheet

Boiler Re-Circulation Pumps & other traditional Constant flow applications - white paper

Submittals (with touch screen)


Submittals (single-phase)


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