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Comment faire pour

Comment faire pour


Produits : MP-V
Fonctionnalités : Matériel
Version produit : 2.0, 2.1, 3.0, 3.1, 3.2, 3.3
21/05/2019

Connecting an Air Velocity Probe to the MP-V Air Flow Sensor

You connect an air velocity probe installed in the duct inlet to the MP-V onboard air flow sensor (differential velocity pressure sensor) to measure the air flow in the VAV terminal unit.

Déclaration

Do not expose the MP-V air flow sensor inputs to moisture during installation or operation. Moisture in the sensor can cause measurement errors.

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

 
action_zoom_plus_stroke MP-V installed over the damper shaft
Figure : 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.

 
action_zoom_plus_stroke MP-V components
Figure : 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).

 
action_zoom_plus_stroke Supported installation orientations
Figure : 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.

 
action_zoom_plus_stroke AM-135 damper shaft adapter
Figure : AM-135 damper shaft adapter
Déclaration

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.

 
action_zoom_plus_stroke Alternative position of the mounting screws for shorter damper shaft lengths
Figure : 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.

 
action_zoom_plus_stroke Two mounting brackets
Figure : 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.

 
action_zoom_plus_stroke Tubing dip
Figure : 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. Pour plus d'informations, voir Configuring an MP-V Damper Command .

Déclaration

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. Pour plus d'informations, voir Configuring an MP-V Damper Command .

Déclaration

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 connect an air velocity probe to the MP-V air flow sensor

  1. Connect tubing to the air velocity probe in the inlet section of the VAV box.

    Déclaration

    A maximum length of 1.2 m (4 ft) FRPE polyethylene tubing with 6.4 mm (0.25 inches) outside diameter and 4.3 mm (0.17 inches) inside diameter is recommended for the typical plenum applications. The MP-V air flow sensor input also supports flexible Tygon tubing (when plenum rating is not required), using tubes with size of 6.4 mm (0.25 inches) outside diameter and 4.8 mm (0.19 inches) inside diameter.

  2. Connect the tube from the low pressure side of the air velocity probe to the barbed fitting labeled (Low) on the MP-V air flow sensor input.

  3. Connect the tube from the high pressure side of the air velocity probe to the barbed fitting labeled (High) on the MP-V air flow sensor input.

    Déclaration

    Ensure you connect the correct tube from the air velocity probe to the correct air flow sensor input on the MP-V, to avoid incorrect control of the VAV terminal unit.

     
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  4. Create a tubing dip that extends at least 75 mm (3 inches) below the barbed fittings.

    Déclaration

    Create a tubing dip to help prevent moisture from entering the MP-V. This applies to all MP-V orientations, but especially orientations with the barbed fittings pointing right or up. Failure to follow these instructions can damage the air flow sensor.

     
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Voir aussi

  • MP-V Device Installation
  • MP-V Air Flow Sensor
  • Installing MP-V on a Damper that Rotates Counter-Clockwise (CCW) to Open
  • Installing MP-V on a Damper that Rotates Clockwise (CW) to Open
  • VAV Box Controls to Full Open State with Maximum Air Flow
  • Air Flow Rate Higher or Lower Than Expected