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Design Envelope 4280 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 and control; general purpose pumping; industrial/ process pumping and control (water or glycol based)

  • Description

    Base mounted end-suction horizontal pumping unit with integrated intelligent controls for easier installation and superior energy performance. Saves up to 75% in energy over comparable traditional constant speed or variable frequency operated pump installations. Units up to 10hp (7.5kW) include integral vibration isolators.

  • Materials
    • Cast-iron or ductile iron casing / ductile iron e-coated casing on units 1-10hp
    • Bronze or stainless steel impeller on units 1-10hp
    • Sintered silicon carbide mechanical seal
  • Configuration

    On-board Intelligent Variable Speed controls with Sensorless control. Controls enclosure UL Type 12 (IP55) indoor applications. 1-10hp (0.75-7.5 kW) range standard with Design Envelope permanent magnet (DEPM) motors that reduce losses by more than 20% over NEMA Premium efficiency. Network capable for remote performance management services.

  • Performance range

    25 to 1000 USgpm (1.5 to 63 L/s) flow; 10 to 160 ft (3 to 48 m) head (composite curves available)

  • Temperature

    250oF (121oC)

  • Power Range

    1 hp to 10 hp (0.75 kW to 7.5 kW)

  • Size

    1.25" to 6" discharge (32 mm to 150 mm)

Lowest First Installed and Lifecycle Operating Cost

  • Integral vibration isolation eliminates the need for inertia bases or baseplates for base-mounted installations
  • Split-coupling design enables easy seal service without removal of pump or motor
  • Active Performance Management through internet connectivity provides lowest lifecycle operating cost
  • No inertia base required for lower installed cost (for 1-10hp only)
Design Envelope

Lowest installed cost. Lowest operating cost.


Lowest Project and Operating Risk

  • Integrated intelligent controls provide fast and easy commissioning as well as reduced radio frequency interference/ improved electromagnetic compatibility
  • Balance rotor design, soft start controls, direct coupling to motor, and reduced overall weight minimize transmission of vibration
  • Optional sediment filters or separators for extended seal life in contaminated systems
  • Single-source responsibility for optimum design and field support
  • Independent operation through embedded Sensorless control or in conjunction with a building automation system (BAS)
  • Design meets ASHRAE 90.1 noise and vibration control recommendations – isolating transmission of vibration between the piping, pump and floor of the building
  • Energy savings through new hydraulics and intelligent motor (for 1-10hp only)



Lowest environmental cost

  • New hydraulics included in Armstrong intelligent motors (PM Motors) in the 1-10hp range provides up to 30% in energy savings.
  • Choose 50:50 of design flow with embedded parallel sensorless control for additional energy savings through best efficiency staging
  • Integrated intelligent controls – combined with perfect component match-up and tuning – for up to 75% in energy savings over traditional constant speed and variable frequency operated pump installations

lowest Lifecyle operating cost

  • Active Performance Management through internet connectivity on all Design Envelope pumps for lowest Lifecyle operating cost.

Learn more


U.S.A. Utility Energy Rebate Info.

360 Service and Support

Design Envelope IVS Pumps with Cloud Based Active Performance Management – 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

Fused Disconnects for use with Design Envelope Pumps - white paper

Design Envelope pump vs. a variable speed drive on the wall - white paper

E-Coating - white paper

Working Clearances of Design Envelope Pump Controls - WhitePaper

Submittals (with touch screen)


Submittals (single-phase)


Submittals (DEPM)


Installation & Operating Instructions


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