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OJ-MRHX Stepper motor for rotary heat exchangers

Along with our OJ-DRHX controller, the OJ-MRHX stepper motor program perfectly meets the rotary heat exchanger demands. Being continuously run at low speeds, the MRHX stepper motor ensures a high starting torque and an even torque curve. Also, it has a smaller carbon footprint. Using a stepper motor both eliminates all risks of oil leakage and the use of worn-out components.

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MRHX-3P01N, 1Nm
MRHX-3P01N, 1Nm
MRHX-3P02N, 2Nm
MRHX-3P02N, 2Nm
MRHX-3P04N, 4Nm
MRHX-3P04N, 4Nm
MRHX-3P08N, 8Nm
MRHX-3P08N, 8Nm
MRHX-3P14N, 14Nm
MRHX-3P14N, 14Nm

OJ-MRHX Stepper MotorDirect and silent control with an even torque curve

Silent control
The MRHX stepper motor is ideal for use with the DRHX drive. Together, they form a system designed especially for rotary heat exchangers.
The system enables accurate and silent control of rotary heat exchangers in ventilation systems.

Even torque
The MRHX stepper motor provides an even torque curve throughout the entire speed range from 1 to 400* rpm. The rotor can be accurately
controlled over a wide operating range, resulting in energy-optimised heat recovery and precise temperature control.
*8Nm motor only up to 250 rpm.

Direct drive
To achieve correct rotor speed, simply mount a suitable pulley on the shaft of the MRHX stepper motor. Energy loss is reduced due to the non-gear solution, which means that motor power is utilized to its maximum. This also helps prolong the life-span of the equipment and minimize service costs.

Hygroscopic applications
The OJ solution supports hygroscopic rotors that typically require a higher speed than traditional rotors. Depending on application and torque
requirement, you can either upgrade in motor size or select a larger pulley.

UL approval
Motor are UL approval as unlisted component according to UL 1004 / CSA C22.2.100 for use in combination with OJ DRHX drive products.

Product Features:

  • 1Nm to 14Nm
  • Sealing grade of IP 54
  • Silent operation
  • Three-phase supply
  • UL 1004 / CSA C22.2.100


Product Documents

Product Sheets
Product Sheet, OJ MRHX, German
File type/size:PDF ( 902.92 KB )
Product Sheet, OJ-MRHX, English
File type/size:PDF ( 902.78 KB )
Brochure, OJ-DRHX-MRHX, English
File type/size:PDF ( 24.23 MB )
Product Catalogue, HVAC Controls and Drives, 2021, English
File type/size:PDF ( 4.20 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Swedish
File type/size:PDF ( 2.96 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Danish
File type/size:PDF ( 2.96 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Dutch
File type/size:PDF ( 3.00 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, English
File type/size:PDF ( 2.95 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Finnish
File type/size:PDF ( 2.96 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, French
File type/size:PDF ( 2.97 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, German
File type/size:PDF ( 2.91 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Norwegian
File type/size:PDF ( 2.96 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Russian
File type/size:PDF ( 3.02 MB )
Instructions, OJ-DRHX-MRHX-1-8Nm, Spanish
File type/size:PDF ( 2.97 MB )
Instructions, OJ-DRHX-MRHX-14Nm, Danish
File type/size:PDF ( 2.92 MB )
Instructions, OJ-DRHX-MRHX-14Nm, English
File type/size:PDF ( 2.92 MB )
Instructions, OJ-DRHX-MRHX-14Nm, Finnish
File type/size:PDF ( 2.92 MB )
Instructions, OJ-DRHX-MRHX-14Nm, French
File type/size:PDF ( 2.94 MB )
Instructions, OJ-DRHX-MRHX-14Nm, German
File type/size:PDF ( 2.97 MB )
Instructions, OJ-DRHX-MRHX-14Nm, Swedish
File type/size:PDF ( 2.93 MB )
Instructions, OJ-DRHX-MRHX-Constant-Speed, English
File type/size:PDF ( 3.04 MB )
Instructions, OJ-DRHX-MRHX-Constant-Speed, German
File type/size:PDF ( 3.04 MB )
Quick Guides
Quick Guide, OJ-DRHX / MRHX (DA, EN, DE, FR)
File type/size:PDF ( 517.35 KB )
BACnet,OJ-DRHX-MRHX, English
File type/size:PDF ( 1.40 MB )
Modbus Protocol, OJ-DRHX-MRHX, English
File type/size:PDF ( 1.37 MB )
MRHX-3P01N, 1Nm

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