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Link Trim Actuator

Features | Overview | Specifications

The Link Trim Actuator (LTA) is an easy to install actuator used for oxygen trim control on single point positioning (jackshaft) burners. The LTA mounts inline as part of the burner fan damper linkage rod.

  • Gallery
Link Trim Actuator - Angled
Link Trim Actuator - Angled

  • Features
  • Mounts In-Line Using Existing Damper Linkage Eliminating The Need For Custom Brackets or Jackshaft Re-Design
  • Field Adjustable +/- 0.15" to +/- 0.75" Trimming; Mechanical Stops Prevent Over-Travel
  • Up to 76 Pounds Thrust Output
  • Self-Locking, Overload Protected, Electric Actuator With Position Feedback
  • Model LTA Actuator, PCC-III Controller, SPS Firing Rate Sensor, and Model ZP Oxygen Analyzer Provide Complete Oxygen Trim Control Package For a Jackshaft Burner
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  • Overview

The Link Trim Actuator (LTA) is an easy to install actuator used for Oxygen Trim control on single point positioning (Jackshaft) burners. The LTA mounts in-line as part of the burner fan damper linkage rod assembly. The LTA actually becomes an integral part of the burner linkage. A short length is cut out from the middle of the existing linkage rod, and the remaining rod ends are inserted into holes in the ends of the LTA. With the LTA at the mid-stroke, or ‘Null’, position, the end-to-end damper linkage rod length will be un-changed, and the burner will operate the same as it did previously. A single screw adjustment sets +/- 0.15" thru +/- 0.75" stroke without changing the LTA mid-stroke (‘Null’) length. This eliminates tedious interactive zero and span adjustments. The LTA end-to-end travel time does not change when the stroke distance is adjusted.

Operation: The Preferred Instruments PCC-III Oxygen Trim Controller has a programmable Oxygen setpoint as a function of burner firing rate.  The controller receives flue gas Oxygen signals from the Model ZP Oxygen analyzer , determines the Oxygen deviation from setpoint, sends a corrective signal to the LTA actuator, which in turn trims the burner air flow.  The existing jackshaft actuator positions the fuel control valve and air damper via the jackshaft linkage. The LTA becomes an integral part of the link (rod) that connects the fan lever arm to the jackshaft lever arm. When the LTA is at mid-stroke, the new fan link is the same length as the original. The LTA movement ‘lengthens’ or ‘shortens’ the fan linkage in order to add or subtract air flow to keep the Oxygen at setpoint.

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  • Specifications

Power: 120 Vac, 3.5 W

Ambient Temperature: 14 deg F to 104 deg F

Input: 24 Vac Increase and Decrease

Motor: DC Motor With Electronic Overload Protection

Operating Thrust: Refer To the “Operating Thrust” Table

Travel: Refer To the “Stroke” Table

Position Feedback: Potentiometer, 1000 ohm

Manual Operation: Pushbutton Clutch Release

Linkage Connections: ⅜" Dia. x ¾" Deep Holes 5/16" Dia. or ½" MNPT With Included Adapters

Stroke Time: 25 Seconds

Dimensions: 4 ⅜" W X 5 ¾" H X 6 ⅞" L

Motor Housing: NEMA 2

Weight: 5.31 lbs.

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