JR Series

The JR Series was designed specifically for wall-fired boilers with burners using a combination of fuel and combustion air. The JR Series controls the secondary air that is introduced at the burner and the air/fuel ratio is regulated by a sliding-sleeve damper to balance the air flow distribution. The JR Series offers ‘split architecture’ with the Power Cylinder and the DPC-777 positioner mounted separately to remove sensitive electronics from the high-temperature area around the boiler and burner.

Power Cylinder:

  • High-temperature rated Linear Position Transducer (LPT) feedback to DPC-777
  • 100% duty-cycle, rated for continuous modulating service
  • 4” diameter thrust rating 1,178 lbf. (5,240 N) at 100 psi
  • 5” diameter thrust rating 1,885 lbf. (8,385 N) at 100 psi
  • 6”, 12” and 18” stroke lengths, digitally adjustable
  • Rated for +300° F (+149° C) ambient environment
  • Fail-in-Place of field selectable to fail-extend or fail-retract


  • Digital Position Controller accurate to +/- 0.5%
  • Push-button calibration
  • Direct or reverse acting, field selectable
  • Limit switch and continuous position feedback options
  • 4-20 mA, 1-5, 0-5 or 0-10 VDC input


  • Reset and local / remote pushbuttons for manual control
  • End position feedback alarm switches
  • Continuous analogue position feedback

See Main Type K Catalogue for further details.

JR Series Type K Damper Drive