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Duct pressure control - static transducer

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XF0

Control component for VAV terminal unit for duct pressure control

Compact device for use with VAV terminal units

  • Controller, static differential pressure transducer and actuator are fitted together in one casing
  • Duct pressure control in ventilation and air conditioning systems up to 550 Pa,
    e.g. pressure control in branch ducts
  • Suitable for clean and contaminated air
  • Constant value control Pmin  or variable control Pmin  – Pmax 
  • Operating parameters Pmin  and Pmax  are set in the factory and saved in the controller
  • Activation of override controls via external switch contacts
  • Change of operating parameters using adjustment devices
  • Service access for manual adjustment devices and PC configuration software

 

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General information

Application

  • All-in-one control devices for duct pressure control
  • Static differential pressure transducer, electronic controller, and actuator are fitted together in one casing
  • Integration with central BMS or stand-alone operation
  • Variable duct pressure control through default setting of setpoint values via analogue signal generated by the central building management system
  • Constant value control for constant duct pressure without additional signalling thanks to set operating value
  • Override controls for the activation of shut-off, OPEN position or control stop is possible via switch contacts or relay
  • Pressure actual value is available as linear voltage signal



Control strategy

  • Duct pressure fluctuations are compensated
  • To prevent the control from becoming unstable, a dead band is allowed within which the damper blade does not move
  • Pmin : selected operating value of lowest duct pressure or constant value
  • Pmax : selected operating value of highest duct pressure
  • Operating parameters are specified via the order code and set in the factory


Operating modes

  • Variable or constant value

Variable operation (V)

  • Setpoint value default setting via analogue interface
  • Signal voltage range corresponds to Pmin to Pmax

Constant value mode (F)

  • A setpoint value signal is not required
  • Setpoint value is Pmin



Interface

Analogue interface with adjustable signal voltage range

  • Analogue signal for pressure setpoint value
  • Analogue signal for pressure actual value



Signal voltage ranges

  • 0 – 10 V DC
  • 2 – 10 V DC



Operating parameters

  • Observe the variable duct pressure range from 25 – 550 Pa
  • Reference point for the output signal: nominal pressure 600 Pa



Parts and characteristics

  • Transducer for static pressure measurements
  • Overload protection
  • Release button to allow for manual operation
  • Terminals with cover
  • Service interface
  • Duct pressure testing set with duct pressure test plug and measuring tube included in supply package

Note:
Depending on variant, e.g. acoustic cladding, differential pressure sensors or pressure connections of the control unit are not accessible for this attachment.




Construction

Type 227P-024-15-DS6 for control units of types

  • TVR, TVJ, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK
  • TVT up to 1000 × 500



Commissioning

  • Due to the duct pressures set in the factory, always ensure that the control units are only installed in the specified locations
  • Install the control unit and wire up the control component
  • Install the duct pressure tap and connect it to the control component via tubing
  • The controller is then ready for use
  • Operating parameters can be adjusted by the customer via the adjustment device


Useful additions

  • Adjustment device type GUIV-A (order code AT-VAV-G)
    for type 227P-024-15-DS6


TECHNICAL INFORMATION

Function, Specification text, Order code

  • Function
  • SPECIFICATION TEXT
  • ORDER CODE
Principle of operation of type 227P-024-15-DS6 XF0_gc_01ai.png

① Differential pressure transducer
② Actuator
③ Differential pressure controller
④ Setpoint value signal or constant value
⑤ Duct pressure measurement point
⑥ Differential pressure sensor of the VAV terminal unit (unused, depending on type and variant possibly not accessible or not available)
p) Differential pressure connection at the transducer of the control component, depending on the installation situation (supply air/extract air):

  • One connection side for duct pressure measurement - see ⑤
  • Connect other connection side to pressure-stable reference measuring point

A static differential pressure transducer converts the differential pressure into a voltage signal. The differential pressure actual value is available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal differential pressure (Δp nom). The differential pressure setpoint value is either a constant value or it comes from a setpoint adjuster or from switch contacts. The controller compares the differential pressure setpoint value to the actual value and controls the actuator accordingly if there is a difference. Differential pressure parameters and signal voltage range are stored in the control component. Customers can easily make changes using an adjustment device or a notebook with service tool.


Category

  • Compact controller for duct pressure
  • Control of a constant or variable duct pressure setpoint
  • Electronic controller for connecting a controlled variable and capturing an actual value signal
  • The actual value signal is based on the nominal pressure such that commissioning and subsequent adjustment are simplified
  • Stand-alone operation or integration in central building management system



Application

  • Static transducer for duct pressure control in ventilation and air conditioning systems

  • Control range 25 – 550 Pa





Supply voltage

  • 24 V AC / DC





Actuator

  • Integral; slow running (running time 150 s for 90°)




Installation orientation

  • Not critical




Interface/signalling


  • Analogue signals (0 – 10V or 2 – 10V DC)




Connection


  • Connecting cable with 4 wires




Interface information

  • Analogue
  • Duct pressure setpoint and actual values

 




Special functions


  • Activation Pmin , Pmax , Closed, Open, Control Stop by means of external switch contacts/circuitry




Parameter setting

  • Operating parameters Pmin , Pmax  factory set
  • Signal characteristic factory set
  • Subsequent adjustment using optional tools: adjustment device, PC software (cable connection in each case)




Factory condition


  • Electronic controller factory mounted on control unit
  • Parameters are factory set (see sticker)
  • Duct pressure testing set with duct pressure test plug and measuring tube included in supply package


TVRD / 200 / D2 / XF0 / PDS / V / PminPmax
||||||||
125678911

1 Type

TVR VAV terminal unit 

2 Acoustic cladding
No entry required: None
D With acoustic cladding 

3 Material
Galvanised sheet steel (Standard construction)

P1 Powder-coated RAL 7001, silver grey
A2 Stainless steel construction 

5 Nominal size [mm]
100, 125 , 160, 200, 250 

6 Accessories

No entry required: None
D2 Double lip seal both sides
G2 Matching flanges both sides 

7 Attachments (control component)
XF0 Compact controller with dynamic transducer
 
8 Equipment function/Installation location
PDS Duct pressure control, supply air
PDE Duct pressure control, extract air 

9 Operating mode

F Constant value (a setpoint value)
V Variable (setpoint value range) 

10 Signal voltage range

0 0 – 10 V DC
2 2 – 10 V DC 

11 Operating values for factory setting
Duct pressure in Pa
Pconst (only with operating mode F)
Pvmin (only with operating mode V)
Pvmax (only with operating mode V)  

Order example: TVR/100/D2/XF0/PDS/V0/300-500 Pa

Acoustic claddingwithout
MaterialGalvanised sheet steel
Nominal size100 mm
AccessoriesDouble lip seal both sides
AttachmentCompact controller for duct pressure
Equipment function/installation locationDuct pressure control, supply air
Operating modeVariable operation – signal voltage range 0 –10 V DC
Operating value300 – 500 Pa
 


Variants

  • VARIANTS



Technical data, Product details

  • TECHNICAL DATA, PRODUCT DETAILS


Compact controllers for VAV terminal units

VAV terminal units

Type of installation componentPart number


TVR, TVJ, TVT, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK


227P-024-15-DS6

A00000038356



 

 

 





Compact controller XF0, 227P-024-15-DS6

Supply voltage (AC)24 V AC ± 20%, 50/60 Hz
Supply voltage (DC)24 V DC ± 20 %
Power rating (AC)5 VA max.
Power rating (DC)Max. 2.5 W
Nominal pressure range0 – 600 Pa
Pressure control range25 – 550 Pa
Torque

15 Nm


Setpoint value signal input

0 – 10 V DC, Ra > 100 kΩ or 2 – 10 V DC,
Ra > 50 kΩ


Actual value signal output

0 – 10 V DC or 2 – 10 V DC,
0.5 mA max.


IEC protection classIII (protective extra-low voltage)
Protection levelIP 42
EC conformityEMC to 2014/30/EU


Analogue interface 0 – 10 V or 2 – 10 V DC (operating mode V, F)

The analogue interface can be set for signal voltage range 0 – 10 V DC or 2 – 10 V DC. The assignment of the duct pressure setpoint value or actual value to a voltage signal is shown in the characteristic curves.

▪ The set signal voltage range applies to both setpoint value and actual value signals

▪ The signal voltage range is pre-set in the factory in accordance with the order code entries

▪ The signal voltage range can be adjusted by others with an adjustment device


Setpoint value default setting

Variable operation

▪ In operating mode V (variable operation), the setpoint comes from an analogue signal on terminal Y

▪ The selected signal voltage range 0 – 10V or 2 – 10V DC is assigned to the pressure range Pmin – Pmax .

▪ Operating values Pmin – Pmax preset at the factory according to the order code

▪ Subsequent adjustment of Pmin or Pmax is possible with adjustment device


Constant value mode

▪ In the operating mode F (constant value mode), an analogue signal is not required on terminal Y

▪ The set duct pressure constant value Pmin is used.

▪ Operating value Pmin is preset at the factory according to the order code

▪ Subsequent adjustment of Pmin is possible with adjustment device


Actual value as feedback for monitoring or tracking control

▪ The actual duct pressure measured by the controller can be captured as a voltage signal at terminal U

▪ The selected signal voltage range 0 – 10V DC or 2 – 10V DC is converted to the pressure range 0 – PNominal .

▪ Reference point PNominal = 600 Pa


Override control

For special operating situations, the duct pressure controller can be put in a special operating mode (override control). The following modes are possible: control Pmin, control Pmax, damper blade in the OPEN position, damper blade CLOSED. Under certain conditions, the control can also be suspended (control stop).


Override control via signal input Y

With appropriate wiring on the signal input Y, the override controls can be activated according to the connection diagrams via wiring with external switch contacts/relays. OPEN and CLOSED are only available if the controller is supplied with alternating current (AC). In the signal voltage range 2 – 10 V, the differential pressure control can be suspended (stop) by connecting input Y to GND.

Override control CLOSED via control signal Y

  • With signal voltage range 0 – 10 V DC: CLOSED is activated when Pmin = 0 is set and control signal Y < 0.5 V DC

  • With signal voltage range 2 – 10V DC: CLOSED is activated when control signal is Y < 0.8V (*1) DC (*1) 0.8V = factory setting


Override control for diagnostic purposes

  • For test purposes, the override control can also be activated via the service tools (adjustment device, PC software).


Prioritisation of various setting options

  • High priority: settings via the service connector (adjustment device, PC software) for test purposes
  • Low priority: settings via Y signal input of the controller


Commissioning

  • On-site adjusting is not required

  • Due to the duct pressures set in the factory, always ensure that the control units are only installed in the specified locations

  • Install control unit in the duct section to be controlled

  • Set up a pressure measurement point


For supply air:

  • Connect the positive connection point of the controller to the duct to be controlled

  • Leave the negative connection point of the controller open


For extract air:

  • Leave the positive connection point of the controller open

  • Connect the negative connection point of the controller to the duct to be controlled

  • The duct connection has to be on the side facing away from the fan

  • Note duct pressure control ranges as per technical data

  • Establish electrical wiring connection

  • The controller is then ready for use


Downloads

product information

certificates

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