Rotary Actuators without Feedback
- 160° rotary electric actuator (adjustable from 45° to 270°)
- 12.5 ft-lb. torque output
- Designed for modulation service
- All gears and roller bearings submerged in oil
- One auxiliary limit switch position output
Overview
The Model DM Actuators provide positive and precise modulating control of boiler draft control dampers, combustion air louvers, or other final control elements:
- The actuator is used to position combustion air & fuel gas dampers and fuel control valves
- An integral interlock switch proves an open damper position for purge proving or a low-fire position for fuel valves prior to light-off, thereby assuring a safe burner light-off
- The DM Actuator is used on control dampers that have a maximum 6.5 sq. ft. area
- For heavy-duty service, use the Preferred Instruments PL-2 linear actuators
Operation
- The DM Actuator utilizes an instantly reversible motor to rotate a hardened steel output shaft through a reduction of precision gears
- The output shaft actuates four adjustable cam operated switches: two (2) travel limit switches to stop motor operation at pre-selected positions and auxiliary switch to provide damper position proving interlocks.
- The motor has an integral brake for positive positioning, and can be stopped, started, or instantly reversed at any time within its travel without overheating or loss of power.
- For maximum durability, the motor and gear train are sealed in an oil filled compartment.
Specifications
Power: Ambient Temp.: Input: Torque: Rotation: Auxiliary Switch: Integral Brake: Linkage: Output Shaft: Motor: Gear Train: Application Example: Dimensions: Enclosure: |
24 Vac - 50 / 60 Hz,20 VA +10º to 125° F Switching SPDT or floating contacts 25 ft-lbs (300 in-lb) breakaway 12.5 ft-lb (150 in-lb) running 160° in 60 seconds, Adjustable 45°-270° Integral SPDT, adjustable, 10 amps. @ 120 Vac Fail-safe, self locking Actuator Lever Arm included; connecting linkage optional Hardened steel Reversible, split phase, capacitor type, oil submerged Precision, hardened steel gears, oil submerged Fuel control valves & balanced boiler outlet damper, up to 6.5 sq. ft. duct 8 ¼" H x 5 27/32" L x 5 1/32" D Die cast aluminum, dust tight, splash proof |
Ordering Information
Specify actuator and linkage as required:
Actuator
DM-1: 24 Vac switching input actuator, auxiliary limit switch and MD3-600 lever arm
DM-2: 24 Vac switching input actuator, auxiliary limit switch and MD3-600 lever arm, 120/24 Vac transformer included.
Linkage
A-22: Linkage kit for mounting of actuator to top of duct or any flat surface, including:
- (1) 48" push rod (catalog number D5-100)
- (2) ball joint connectors (catalog number MD5-602)
- (1) damper lever arm for ½" shaft (catalog number MD3-601)