Fast-Acting, Two-Position Actuators are spring return direct coupled actuators (DCA) for on/off damper control. The actuator accepts an on/off signal from a single pole, single-throw (spst) controller. Reversible mounting allows actuator to be used for either clockwise (cw) or counterclockwise (ccw) spring rotation.
What is a Honeywell damper actuator?
The M847D actuators are two positions, 24 Vac spring return damper actuators designed to operate directly driven zone or vent dampers, used to control airflow in ducts. When power is removed from the motor, the damper springs back to its normally open or normally closed position.
What is the difference between a two position control and a modulating control?
This is referred to as TWO POSITION control. This type of control is used with failsafe actuators. In modulating/proportional control, the output to the actuator varies continuously and is not limited to being fully open or fully closed.
What is a floating point actuator?
On/Off or Open-Close: The actuator is able to drive either to its full open position, or to its full closed position. 3-point, Tri-State, Floating Point: The actuator has both clockwise (CW) and counter-clockwise (CCW) control inputs. One drives the actuator to its open, the other to its close position.
What are two-position controls?
Two-position control compares the value of an analog or variable input with instructions and generates a digital (two-position) output. The instructions involve the definition of an upper and lower limit. The output changes its value as the input crosses these limit values.
What is the difference between floating and modulating actuator?
Floating is typically called THREE POSITION control (open/stop/close or on/stop/off). Two digital outputs are used (DO-1 opens and DO-2 closes the actuator and if there is no signal, the actuator stops and maintains its present position. Popular modulating control signals include 4-20mA and 2-10V.
What is the difference between floating and proportional control?
Floating control is a relatively simple control mode. Essentially you have a logical control block, called a float sequencer. A Float Sequencer takes a proportional control signal, 0-100%, as it’s input. This block will then control the control device using two physical outputs.
What causes damper to not open?
First, the flue may be clogged with ash or debris and may require a good cleaning. Second, the damper may be causing the smoking problem. If the damper will not open fully, it will cause the smoke to go back down into the room instead of exiting up the flue. Debris or ash buildup inside the flue can cause this.
