SmartFan® Multi SD Programmable DC Fan Controller

SmartFan® Multi SD DC Fan Controller, NOW PROGRAMMABLE


  • Fan Speed Control for 2 & 3 Wire DC Fans

  •    5 Amp Rating
  •    Compatible with TachScan Fan Speed Alarm Products
  •    Compatible with Hand-held / Menu Driven Navigator Programmer
Operation / Installation PDF

Multi SD Datasheet

SmartFan® Multi-SD is a programmable fan speed control and alarm designed for two and three wire 12V, 24V, and 48V DC fans and blowers rated up to 5 Amps.  The Multi SD can regulate the speed of one or more fans by changing the fan supply voltage in relation to a control input (temperature or 0-4VDC PWM signal).  The Multi-SD can be customized for your application using the Navigator hand-held programmer.  The Navigator can be used to create custom fan/motor speed control curves based on temperature or PWM input.  Other programming variables include: on/off set points, alarm trigger points and override speed settings.  Simply plug the Navigator into a powered Multi-SD and scroll through the 11 variable menus, selecting the control inputs for your application.  Programmed profiles can be saved and copied to multiple controllers with ease.  Factory preprogramming available for orders of 50 or more.

Specifications Other Features
  • » Power Source: 10-75VDC, (Single or Dual)
  • » Current Rating: 4 Amps @ 55°C or less, 5 Amps in air-flow (200 ft/min)
  • » Operating Environment: -20°C to 55°C, 0-95% RH Non-condensing
  • » Storage temperature: -40°C to 125°C
  • » Weight: 1.9 oz. (54 grams)
  • » Control Input:
    • – Up to 3 P-series or S-series thermistors
    • – 0-4VDC PWM input, must be isolated from input supply voltage


  • Advantages over older 042D440-F & 042D440R-F Multi-SD design
    • – 0-4VDC PWM control capability
    • – Easy menu-driven digital programming
    • – Wider & more detailed programming options for increased accuracy and flexibility
    • – Save and copy control variables from unit to unit
    • – Compatible with more temp. sensors with tighter tolerance at lower cost
    • – Programmable motor on/off control
  • » Navigator Programmable Variables:
    • – Control Input: up to 3 sensors or PWM
    • – Min. & Max. fan speed
    • – Override speed
    • – Min. & Max. control signal
    • – Motor On/Off set points
    • – Speed on signal loss (fail safe)
    • – Alarm trip points
    • – Temp. sensor series
  • » High efficiency, >90% typical
  • » Soft starts & current limiting at startup
  • » Noise reduction of 15 dB(A) or more typical at idle speed
  • » Compatible with TachScan fan speed alarms
  • » RoHS compliant
  • » Factory programming for orders of 50 units and up
  • » 2 Year Warranty
  • » Made in the USA
  • » UL recognized to UL 508 and CAS-C22, File E100344

SmartFan Multi SD Fan Control & Alarm Dimensions

For CAD drawings, click here. 

SmartFan Multi SD Fan Control & Alarm Part Numbers

Part Number Current Rating (55°C) Supply Voltage Range Isolated Alarm Sinking Current
200 LFM Still Air
042D440-01 5.0A 4.0A 10 – 75 VDC 1 mA
042D440R-01 5.0A 4.0A 10 – 75 VDC 100 mA
PRG00-F Navigator Hand-Held Programmer, required to program Multi-SD (for sale or rent)
042D440-F & 042D440R-F: not Navigator compatible, not recommended for new designs, click for Instructions
Temperature Sensors (order separately)
H118-F                          Hardware Pack

Additional Information

» Multi SD Operation / Installation Datasheet
» Multi SD STEP CAD Drawing (.stp)
NOTE: If the CAD file opens as a new browser window with text, right click the link, select “Save Link As”, and select a local folder to save the file.
» Temperature Sensors Page
» Navigator Instructions
» SmartFan Price List
» Click here for Questions or Comments

To talk to an Engineer or Service Representative, call (978) 486-4160 (9:00 AM – 5:00 PM EST)

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