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
2 © Copyright 2007 TAC All Rights Reserved. F-27169-5
Applicable Literature
SPECIFICATIONS
Actuator Inputs
Control Signal: See Table-1 for actuator models and control type.
Power Input: See Table-1. All 24 Vac circuits are Class 2. All circuits 30 VAC and above
are Class 1.
Connections: 3 ft (91 cm) appliance wire or plenum cables, enclosure accepts 1/2” (13
mm) conduit connectors. For M20 Metric connector, use AM-756 adaptor.
Actuator Outputs
Electrical:
Position Feedback Voltage (proportional or floating only),
For voltage ranges, the feedback signal is the same range as the input signal. The 4-
20 mAdc current range and floating actuators have a 2-10 Vdc position feedback
signal. The position feedback signal can supply up to 0.5 mAdc to operate up to four
additional slave actuators.
Mechanical:
Linear Stroke, 1/2” (13 mm) nominal.
Approx. Stroke Timing, See Table-1.
Manual Override, Allows positioning of valve and preload using manual crank.
Right/Left Jumper, Permits reverse acting/direct acting linear motion (MS51 only).
Environment:
Ambient Temperature Limits,
Shipping & Storage, -40 to 160 °F (-40 to 71 °C).
Operating, -22 to 140 °F (-30 to 60 °C).
Temperature Restrictions, For maximum ambient 140
°F (60
°C) the maximum
allowable fluid temperature should not exceed valve rating. See F-27252 Selection Guide
for specific ratings.
Humidity: 5 to 95% RH, non-condensing.
Location:
NEMA 1. NEMA 2 (enclosure is air plenum rated), UL Type 2 (IEC IP54) with customer
supplied water tight conduit connectors.
Agency Listings
UL 873: Underwriters Laboratories (File #E9429 Category Temperature-Indicating and
Regulating Equipment).
CUL: UL Listed for use in Canada by Underwriters Laboratories. Canadian Standards
C22.2 No. 24-93.
European Community: EMC Directive (89/336/EEC). Low Voltage Directive (72/23/EEC).
Australia: This product meets requirements to bear the C-Tick Mark according to the terms
specified by the Communications Authority under the Radio Communications Act 1992.
F-Number Description Audience Purpose
F-26080 EN-205 Water System Guidelines
– Application Engineers
– Installers
– Service Personnel
– Start-up Technicians
Describes TAC approved water treatment
practices.
F-27252
Vx-7xxx-8xx Series Vx-7xxx-59x Series Vx-9xxx-8xx
Series Vx-9xxx-59x Series Selection Guide
– Sales Personnel
– Application Engineers
– Installers
– Service Personnel
– Start-up Technicians
Provides Mxx1-720x and Mx51-710x
actuator, valve, and valve assembly
selection data including specifications,
close-off pressures, and dimensional
information.
F-26895
AM-703 Input Scaling Module, AM-704 Pulse Width
Modulation Interface, AM-705 Positioner, AM-706
Positioner, AM-708 Resistor
– Installers
– Service Personnel
– Start-up Technicians
Provides step-by-step mounting
instructions
F-27175
AM-756 Metric Conduit Adapter, AM-763 Hexcrank, AM-
770 Replacement Valve Linkage Parts Kit
Provides step-by-step mounting
instructions
F-27382 TAC Electric/Electronic Products Catalog
– Sales Personnel
– Application Engineers
Comprehensive catalog containing TAC’s
electric/electronic actuators, thermostats,
controllers, sensors, transmitters, and
accessories