User Guide
Table Of Contents
- Application
- Features
- . Two position models controlled by SPST controller
- . Floating models controlled by SPDT floating controllers
- . Proportional models controlled by 0-3 Vdc, 6-9 Vdc, 0-10 Vdc, 0-20 mAdc, 2-10 Vdc, or 4-20 mAdc. Control function direct/reverse action is jumper selectable
- . 105 lb force (467 newton) with 1/2" (13 mm) nominal linear stroke
- . 24 Vac, 120 Vac, and 230 Vac models
- . Rugged polymer housings rated for up to NEMA 2/IP54
- . Overload protection throughout stroke
- . Automatically sets input span to match valve travel
- . Compact size to allow installation in limited space
- . Manual override to allow positioning of valve and preload
- . Spring return operation
- . Direct mount to valves without separate linkage
- . Polymer housing rated for plenum use
- . Five year warranty
- Applicable Literature
- SPECIFICATIONS
- TYPICAL TWO POSITION CONTROL (wiring diagrams)
- Figure-1 Typical Wiring Diagrams for Two Position Actuators
- TYPICAL FLOATING CONTROL (wiring diagrams)
- TYPICAL PROPORTIONAL CONTROL (wiring diagrams)
- INSTALLATION
- Figure-8 Wire Diagram Notes Guide
- Inspection
- Requirements
- Precautions
- Location
- Mounting
- Changing Control Function (proportional units only)
- Installation: Mx51-710x Series Actuator to 1/2" to 2" VB-7xxx Series Valve Bodies, 2-Way Stem-Up Closed and 3-Way Mixing or Diverting Applications
- A. Preload the valve to insure proper close-off according to the numbered steps in Figure-10 and the text below. (Remove power before proceeding.)
- 1. Locate the steel jam nut that came packaged with the actuator. (Do not re-use the brass jam nut present on an existing valve.)
- 2. Screw the nut onto the valve stem all the way as far as it will go (you may need to use a TOOL-20-1 or a 5/16” open-end wrench). At least 1/2” of the valve stem should extend above the nut.
- 3. Thread the stem extension onto the valve stem, making contact with the jam nut. Raise the valve stem to the full up position.
- 4. Orient the actuator mounting bracket on the valve and tighten the hex mounting nut securely against the bracket using TOOL-37.
- 5. Insert the crank provided in the actuator cover. Wind the crank two turns counterclockwise. Press in the turn crank 1/8 turn counterclockwise to lock in position.
- 6. Rotate the stem extension until the through holes in the stem extension and rack line up. Insert connecting pin to secure stem extension and tighten jam nut against stem extension using TOOL-20-1 or a 5I16” open end wrench.
- B. Apply power to the actuator and check the system operation for heating or cooling output in response to the control signal.
- Installation: Mx51-710x Series Actuator to 1/2" to 2" VB-7xxx Series Valve Bodies, 2-Way Stem-Up Open
- A. Preload the valve to insure proper close-off according to the numbered steps to 10 and the text below. (Remove power before proceeding.)
- 1. Locate the steel jam nut that came packaged with the actuator. (Do not re-use the brass jam nut present on an existing valve.)
- 2. Screw the nut onto the valve stem all the way as far as it will go (you may need to use a TOOL-20-1 or a 5/16” open-end wrench). At least 1/2” of the valve stem should extend above the nut.
- 3. Thread the stem extension onto the valve stem, making contact with the jam nut. Push the valve stem to the full down position.
- 4. Orient the actuator mounting bracket on the valve and tighten the hex mounting nut securely against the bracket using TOOL-37.
- 5. Insert the crank provided in the actuator cover. Wind the crank counterclockwise until the actuator fully extends, then unwind 2 turns and press in and turn crank 1/8 turn counterclockwise to lock in position.
- 6. Rotate the stem extension until the through holes in the stem extension and rack lineup. Insert connecting pin to secure stem extension and tighten jam nut against stem extension using TOOL-20-1 or a 5I16” open end wrench.
- B. Apply power to the actuator and check the system operation for heating or cooling output in response to the control signal.
- Valve Mounting
- 1. Following general piping practices is recommended.
- 2. Apply pipe sealant sparingly to all but the last two threads of a properly threaded, reamed, and cleaned pipe. Make sure the ...
- 3. Start the joint hand-threading the pipe into the valve. If the thread alignment feels normal, continue to turn the pipe by hand as far as it will go.
- 4. Use a pipe wrench to fully tighten the pipe to the valve.
- 5. Insulate only the valve body and associated piping, not the actuator.
- 6. In chilled or cold water systems where the environment is humid, use a drip pan under the valve to catch condensate.
- Figure-11 Acceptable Mounting Orientations for Non-Steam Applications
- Figure-12 Acceptable Mounting Orientation for Steam Applications
- 1. Following general piping practices is recommended.
- MANUAL OVERRIDE OPERATION
- Figure-13 Unacceptable Mounting Orientation
- 1. Disconnect power from the actuator. The actuator will fully retract.
- 2. Without pushing down on the crank, crank the manual override counterclockwise until the actuator extends to the desired position. Push in until the mechanism locks in position. (The manual override lock will release the next time power is applied.)
- 3. If you desire to reposition the actuator manually from a locked position, turn the crank 1/8 turn counterclockwise and pull out to release. Adjust position as desired.
- Wiring Requirements
- Table-2 Power Wiring
- CHECKOUT
- THEORY OF OPERATION
- MAINTENANCE
- FIELD REPAIR
F-27169-5 © Copyright 2007 TAC All Rights Reserved. 13
as determined by the control signal. Refer to Table-3 for valve flow.
2. Break power to the actuator. Actuator and valve should return to the spring return
position (retracted position).
Table-3 Assembly Configuration Chart
Note: Check that the transformer(s) are sized properly.
• If a common transformer is used with multiple actuators, make sure that polarity is
observed on the secondary. This means connecting all black wires to one leg of the
transformer and all red wires to the other leg of the transformer.
• If multiple transformers are used with one control signal, make sure all black wires are
tied together and tied to control signal negative (-).
• If the controller uses a full-wave power supply and does not provide isolated outputs, a
separate transformer is required.
THEORY OF OPERATION
The MA, MF and MS series actuators are directly mounted onto the valve without the use of
a separate linkage. They are equipped with true mechanical spring return operation for
reliable, positive close-off on valves. When power is applied, the actuator moves to its
powered position, at the same time tensing the spring return safety mechanism. When the
power is removed, the spring returns the actuator to its normal position (retracted position).
The spring return system provides consistent close-off force to the valve.
MA series two-position actuators use a DC motor controlled by on board electronics. When
the actuator encounters a stall or end of travel position, the motor current is automatically
reduced, preventing damage to the actuator or motor.
MF or MS series floating or proportional actuators use a DC motor which is controlled by a
microprocessor. The microprocessor supplies the intelligence to provide a constant speed
and to know the actuator’s exact position. The microprocessor monitors and controls the DC
motor’s rotation and provides a digital rotation sensing function to prevent damage to the
actuator in a stall condition.
All actuators may be stalled anywhere in their normal rotation without the need of a
mechanical end switch.
MAINTENANCE
Regular maintenance of the total system is recommended to assure sustained optimum
performance. The Linear series actuators are maintenance free.
FIELD REPAIR
None. Replace with a functional actuator.
Valve Body Valve Body Action
Normal Position
Action
a
a
Proportional models shipped with RA/DA jumper set for DA (actuator extends with increasing signal).
Valve Stem Flow
VB-721x
VB-921x
b
b
Discontinued 1/2” to 1-1/4” VB-9xxx.
Two-Way Stem Up Open Up Open A to AB flow decreases as actuator extends
VB-722x
VB-922x
b
Two-Way Stem Up Closed Up Closed A to AB flow increases as actuator extends
VB-731x
VB-931x
b
Three-Way Mixing Up B to AB
A to AB flow increases as actuator extends
B to AB flow decreases as actuator extends
VB-732x
VB-932x
b
Three-Way Diverting Up B to AB
B to A flow increases as actuator extends
B to AB flow decreases as actuator extends