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How to How to 10/14/2021
Products: MP-V
Functionalities: Hardware
Product version: 2.0, 2.1, 3.0, 3.1, 3.2, 3.3

Moving the Damper Shaft Mounting Screws to the Alternative Positions

You move the two damper shaft mounting screws to the alternative positions to be able to install the MP-V over a damper shaft with an exposed length that is less than 54 mm (2.125 inches) but greater than 22.2 mm (0.875 inch).

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The MP-V incorporates an integral actuator and the device is designed for over-the-shaft damper installation.

MP-V installed over the damper shaft

MP-V installed over the damper shaft

The MP-V can be used with dampers that are opened in clockwise (CW) position as well as dampers opened in counter-clockwise (CCW) position. You use WorkStation or the eCommission SmartX Controllers mobile application to configure the MP-V actuator direction of rotation accordingly.

MP-V components

MP-V components

The MP-V is typically installed with the air flow sensor barbed fittings pointing down (orientation B in the figure below). The MP-V can also be installed with the barbed fittings pointing left (A), right (C), or up (D).

Supported installation orientations

Supported installation orientations

With a downward extension, the available area around the damper shaft must measure:

  • 160 mm (6 inches) down from the lower edge of the shaft,

  • 120 mm (4.5 inches) to the right,

  • 45 mm (1.75 inches) to the left, and

  • 45 mm (1.75 inches) above the shaft.

Ensure that the location allows enough clearance for servicing.

The MP-V actuator is designed to be installed over a 12.7 mm (0.5 inch) diameter round damper shaft with a minimum of 54 mm (2.125 inches) exposed damper shaft length.

When the damper shaft diameter is less than 12.7 mm (0.5 inch), an adapter is required. An adapter with part number AM-135 can be ordered from Schneider Electric to enable installation on a 9.5 mm (0.375 inches) diameter damper shaft.

AM-135 damper shaft adapter

AM-135 damper shaft adapter

Important:

The cutout section of the shaft adapter must be positioned such that the damper shaft mounting screws are tightened against the damper shaft and not the adapter cylinder.

When the exposed damper shaft length is less than 54 mm (2.125 inches) but greater than 22.2 mm (0.875 inch), you move the damper shaft mounting screws from the actuator collar to the alternative screw holes on the MP-V actuator.

Alternative position of the mounting screws for shorter damper shaft lengths

Alternative position of the mounting screws for shorter damper shaft lengths

The MP-V also has two mounting brackets, which allow you to choose the mounting bracket that best accomodates the available access space in the VAV mounting area. You position the anti-rotation clip in the desired mounting bracket.

Two mounting brackets

Two mounting brackets

The MP-V onboard air flow sensor is connected to an air velocity probe in the VAV box using two tubes. A dip in the tubing helps prevent moisture from entering the MP-V and damaging the air flow sensor. The dip should extend below the elevation of the barbed fittings. This applies to all MP-V orientations, but especially C and D.

Tubing dip

Tubing dip

The MP-V is delivered with terminal blocks installed on the device. Spare terminal blocks can be ordered separately using the part number SXWMPVCON10001.

The terminal blocks are removable. You can quickly and easily replace an MP-V because no terminal wiring is affected.

When the MP-V is powered up for the first time, the MP-V software automatically performs an actuator travel and damper position calibration. The calibration operation drives the damper actuator in the close direction and registers the position when the actuator encounters the stop. The software then drives the actuator in the open direction and registers the position when the stop is encountered. The software uses that information to scale the 0 to 100% span. Mechanical obstructions hindering the damper actuator rotation during the calibration process can adversely affect the calibration results and thus the VAV damper operation. In that case, you can manually run a recalibration. For more information, see Configuring an MP-V Damper Command .

Important:

Initial calibration of actuator travel and damper position is performed automatically when the MP-V is powered up for the first time. If you subsequently press the manual override button, you must recalibrate the MP-V manually. For more information, see Configuring an MP-V Damper Command .

Notice

VAV DAMPER NOT PROPERLY CONTROLLED

  • Ensure that the MP-V is properly installed and secured prior to application of the 24 VAC power.

  • Ensure that the MP-V damper actuator can rotate freely between the fully open and fully closed positions.

Failure to follow these instructions can result in the VAV damper not being properly controlled by the MP-V.

To move the damper shaft mounting screws to the alternative positions
  1. Remove the two damper shaft mounting screws from the MP-V actuator collar using a 1/8-inch hex key.

  2. Remove the actuator collar.

  3. Press and hold the manual override button and rotate the actuator counter-clockwise (CCW) until the two screw holes for short damper shafts (alternative positions) become accessible.

  4. Install the damper shaft mounting screws in the two screw holes for short damper shafts.

You can now install MP-V.

Important:

When using the alternative positions for shorter damper shaft lengths, tighten the damper shaft mounting screws to the following recommended torque:

  • Steel damper shafts: 4.5 to 5.6 Nm (40 to 50 lbf.in)

  • Aluminum damper shafts: 4.0 to 5.1 Nm (35 to 45 lbf.in)

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