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
12 © Copyright 2007 TAC All Rights Reserved. F-27169-5
MANUAL OVERRIDE OPERATION
When necessary, the actuator’s output shaft can be repositioned using the manual override
mechanism as follows:
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.
Caution:
• Only use manual override when the actuator drive motor is not powered.
• Engaging the manual override when the actuator is powered may cause damage to the
gears.
• Using power tools to adjust the override will cause damage to the gears.
Wiring Requirements Control Leads
See Table-2 for power wiring data. Refer to Figure-1 through Figure-7 for typical wiring.
Table-2 Power Wiring
CHECKOUT
After the entire system has been installed and the actuator has been powered up, the
following check can be made for proper system operation. Check for correct operation of the
valve while actuator is being stroked.
1. Apply power to the actuator. Actuator and valve should be driven to their powered position
0°0°
180°
90°90°
180°
Figure-13 Unacceptable Mounting Orientation
Actuator
Voltage
Part Number
Maximum Wire Run in ft. (m)
12 AWG 14 AWG 16 AWG 18 AWG 20 AWG 22 AWG
24 Vac
20-30 Vdc
MA51-7103
1678
(512)
1055
(322)
664
(202)
417
(127)
263
(80)
208
(63)
MF51-7103
1289
(393)
810
(247)
510
(155)
321
(98)
202
(61)
160
(49)
MS51-7103
1140
(348)
717
(219)
451
(137)
284
(86)
178
(54)
141
(43)