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VR3452 ECM High-Efficiency Circulator

ECM Wet Rotor Circulation with Integrated Electronic Regulation

The VR3452 ECM High-Efficiency Circulator is a self-adjusting, high-efficiency wet rotor circulator for chilled and hot water applications. All settings can be accomplished on the user-friendly interface. The ECM permanent magnet motor saves up to 85% of the electrical energy compared to conventional pumps.

Proportional Pressure

The VR3452 ECM High-Efficiency Circulator operates on a pre-programmed inclining performance curve where the differential pressure increases with flow. Hset on the user interface relates to the differential pressure at maximum speed with a corresponding differential pressure at zero flow of half of the Hset value. Hset range from 4.5′ to 35′ in 0.5′ increments. Factory default is 17.5′.

Constant Pressure

The VR3452 ECM High-Efficiency Circulator operates at a constant differential set pressure (Hset on the user interface) from zero flow to maximum speed. Once maximum speed is reached the differential pressure drops as flow increases in a similar manor to a constant speed pump. Hset range from 4.5′ to 35′ in 0.5′ increments. Factory default is 17.5′

Fixed Pressure

The VR3452 ECM High-Efficiency Circulator operates at its programmed speed between 1100 & 4400 RPM as set by the operator (RPMset on the user interface). Factory default is max speed (4400 RPM).

Night Setback Turndown

When VR3452 ECM High-Efficiency Circulator operates in night mode, it automatically switches between the selected operating curve in the mode and night curve. The transition to the night mode depends on the media temperature in the system. When the night mode is prepared for operating, its icon illuminates and the VR3452 ECM High-Efficiency Circulator operates in the selected operating curve of the mode. When the pump identifies the media temperature fall by 59-68F° (approximately during 2 hours), the icon starts to blink and the pump switches to the night curve. When the media temperature rises again, the icon stops blinking and the pump passes over to the operating curve in the selected operating mode. The night mode operates only in combination with the above indicated modes. It is not an independent operating mode.

Instruction Sheet
Submittal Data
Replacement Parts
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Performance Data

Flow Range: 0-52 GPM
Head Range (ft): 0-34′
HP: 1/100 – 1/4
Max. Operating Pressure: 145 PSI
Max. Water Temp.: 230°F (110°C)
Min. Water Temp.: 14°F (-10°C)
Ambient Temp. Range: 32°F (0°C) to 104°F (40°C)
Min. Inlet Pressure: 112˚F (50˚C) 0.73 PSI/ 0.05 bar 176˚F (80˚C) 5.8 PSI / 0.4 bar 230˚F (110˚C) 15.95 PSI/ 1.1 bar
Electrical specifications: 1phase,110-120V, 47-63Hz (VR3452-HY1) 1phase, 200-240V, 47-63Hz (VR3452-HB1)
Operating Power: 1/4HP, 10-180W
Rated Current: (1 phase, 115V) 0.1A to 2.5A (1 phase, 230V) 0.1A to 1.5A
Connection Size: ¾”- 1½” Flanged

  • High-efficiency ECM motor uses up to 85% less electricity
  • LED displays watts, flow, head, and RPM
  • Compact size for easy handling and installation
  • Plug & play simplicity
  • Robust construction for long life
  • Industry standard flange configuration and lay length
  • Low noise operation
  • Cataphoresis coated volute
  • Communication module (Standard on -FC1A01 models):
    • Ethernet communication
    • Modbus RTU communication
    • Analog Control input 0 – 10 V
    • 3 analog inputs/outputs
    • 1 relay output
    • Main, Standby, Parallel Pump Operation
  • Continuous Duty
  • Built in start-up circuit
  • Equipped with a cast iron casing and should be used for closed loop systems only
  • Taco circulator pumps are for indoor use only
  • Acceptable for use with water or maximum of 50% water/glycol solution
  • Degree of protection: IP 44, Class 2
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