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Duct pressure control - static transducer

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Selectable safe position

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XF4

Control component with spring return actuator for VAV terminal units for duct pressure control

Compact device for use with VAV terminal units

  • Controller and static differential pressure transducer for duct pressure in one casing
  • Separate actuator with spring return for adjustable safe position
  • 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 and control electronics combined in one casing
  • Separate actuator with spring return
  • Integration in central building management system or stand-alone operation
  • Variable duct pressure control through 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 parameterised operating value
  • Override controls for the activation of shut-off, OPEN position, control stop possible via switch contacts or relay
  • Duct 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 minimum duct pressure or constant value
  • Pmax: selected operating value of maximum duct pressure
  • Operating parameters are specified via the order code and set in the factory


Operating modes

Variable operation (V)

  • Setpoint value 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 corresponds to 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
  • Terminal connections for power and signalling
  • Socket for the actuator
  • Terminals with cover
  • Service interface
  • Manual actuator adjustment with crank handle
  • Spring-winding mechanism can be locked with crank handle
  • Spring-winding mechanism can be unlocked with crank handle


 



Note:

Differential pressure connections on the outside of the control unit are not accessible with this attachment depending on the variant, e.g. acoustic cladding.

Construction

GUAC-PM6 with spring return actuator 341C-024-05-V/ST06 for:
▪   TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA,
▪   TVRK up to NW 250
GUAC-PM6 with spring return actuator 361C-024-20-V/ST06 for:
▪   TVJ
▪   TVT up to dimensions of 1000 x 600
▪   TVRK from NW 315





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 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 with an adjustment device, controller potentiometer including display or PC software.




Useful additions

  • Adjustment device type GUIV2-A (order code AT-VAV-G)
     


Technical information

Function, Specification text, Order code 

  • Function
  • SPECIFICATION TEXT
  • ORDER CODE
Principle of operation for type 227P-024-15-DS6 XF4_gc_02ai.png

① Differential pressure transducer
② Actuator
③ Differential pressure controller
④ Setpoint value signal or constant value
⑤ Duct pressure tapping point
⑥ Differential pressure sensor of the VAV terminal unit (unused, depending on type and variant possibly not accessible or not available)
⑦ 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
  • Use other connection side for pressure-stable reference measuring point

A static differential pressure transducer converts the duct 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. If the supply voltage is interrupted or a wire breaks, the spring return actuator moves to the safe position OPEN (NO) or CLOSED (NC) as specified in the order code.

Category

  • Universal controller for duct pressure with safe position



Application

  • Control of a constant or variable duct pressure setpoint
  • Electronic controller for signalling a reference value and for tapping 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


Area of application

  • Static transducer for duct pressure control in ventilation and air conditioning systems
  • Control range 25 – 550 Pa


Actuator

  • Spring return actuator for defined safe position of the damper blade in case of power failure
  • Run time max. 150 s for 90°; run time of spring return < 20 s for 90°


Installation orientation

  • Not critical


Connection

  • Connection terminals


Supply voltage

  • 24V AC/DC


Interface/signalling

  • Analogue signal 0 – 10 V DC or 2 – 10 V DC


Interface information

  • Analogue: Duct pressure setpoint and actual values


Special functions

  • Display for volume flow actual value and parameter setting
  • Activation Pmin, Pmax, Closed, Open, Control Stop by means of external switch contacts/circuitry


Parameter setting

  • Operating values Pmin, Pmax factory set
  • Signal characteristic factory set
  • Subsequent adjustment directly via control elements and display on the controller or by means of optional tools: adjustment device, PC software (cable connection in each case)

TVRD / 200 / D2 / XF4 / PDS / V0 / PminPmaxPa / NC
||||||||||
1256789101112
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)
XF4 Universal pressure controller, Static 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)
 
12 Damper blade position
NO Power off to OPEN
NC Power off to CLOSE
 
 Order example: TVR/100/D2/XF4/PDS/V0/300-500 Pa/NO
Acoustic claddingWithout
MaterialGalvanised sheet steel
Nominal size100 mm
AccessoriesDouble lip seal both sides
AttachmentUniversal controller for duct pressure, spring return actuator
Equipment function/installation locationDuct pressure control, supply air
Operating modeVariable operation – signal voltage range 0 –10 V DC
Operating value300 – 500 Pa
Damper blade positionNO, Power off to OPEN

 

Variants

  • VARIANTS


Technical data, Product details

  • TECHNICAL DATA, PRODUCT DETAILS


Compact controllers for VAV terminal units






Controller




Spring return actuator





Order code detail

Part numberTypePart numberType

VAV terminal units

XF4A00000038354GUAC-PM6A00000038357

341C-024-05-V/ST06


XF4A00000038354GUAC-PM6A00000038355

361C-024-20-V/ST06



① TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK up to NW 250

② TVJ, TVT up to dimensions 1000 x 500, TVRK from NW 315

 

 



Differential pressure controller GUAC-PM6

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 plus actuator used *


Nominal pressure range

0 – 600 Pa plus actuator used *


Pressure control range25 – 550 Pa
Torque

15 Nm


Input for setpoint value signal or override control



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
Weight0.570 kg

* When dimensioning the transformers and the supply cable for the universal controller, the power consumption of the associated actuator must be taken into account.

** Input can be connected to supply voltage as part of override control.



Actuator with spring return 341C-024-05-V/ST06

Supply voltageFrom the controller

Power consumption for motor (movement)



5.0 W




Standby power consumption (end position)




2.0 W


Rating



7.5 VA


Torque

5 Nm


Run time for 90°

100 s


Spring return time

< 20 s


Setpoint value signal inputFrom the controller
IEC protection classIII (protective extra-low voltage)
Protection levelIP 54 (cable entry at the bottom)
EC conformityEMC to 2014/30/EU
Weight

1.3 kg




Actuator with spring return 361C-024-20V/ST06

Supply voltageFrom the controller

Power consumption for motor (movement)



8.0 W




Standby power consumption (end position)




2.0 W


Rating



11.5 VA


Torque

20 Nm


Run time for 90°

150 s


Spring return time

< 20 s


Setpoint value signal inputFrom the controller
IEC protection classIII (protective extra-low voltage)
Protection level

IP 54

EC conformityEMC to 2014/30/EU
Weight

1.6 kg



 




Range of display functions

Display functions

  • Duct pressure actual value (unit Pa)
  • Display via 3-character display with positional notation (vertical line is used as thousands separator)
  • Status and error display for various operating states, including display of activated override control, display of diagnostic function
  • Display of the firmware version

 


Setting options

  • Work areas Pmin, Pmax
  • Signal voltage range 0 – 10 V or 2 – 10 V DC

 


Diagnostic function

  • Activation of override controls OPEN, CLOSED, qmin, Pmax, motor stop

 


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 pressure tap for duct pressure
    For supply air:
    - Connect differential pressure connection "+" of the controller to the duct to be regulated
    - Leave differential pressure connection "-" of the controller open
  • For extract air:
    - Leave differential pressure connection "+" of the controller open
    - Connect differential pressure connection "-" of the controller to the duct to be regulated
  • The connection for the pressure tapping point on the duct must always be made 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



 



Product details

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

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

  • The set signal voltage range always applies equally for setpoint value and actual value signals.
  • The signal voltage range is pre-set in the factory according to the order code entries.
  • Signal voltage range can be adjusted on site in the adjustment menu on the display, via adjustment device or PC software.


Setpoint value setting

Variable operation

  • In the operating mode V (variable operation), the setpoint value is specified with an analogue signal on terminal Y.
  • The selected signal voltage range 0 – 10 V or 2 – 10 V DC is assigned to the pressure range Pmin – Pmax.
  • Operating values Pmin – Pmax pre-set in the factory according to the order code entries.
  • Subsequent adjustment of Pmin or Pmax can be adjusted in the adjustment menu on the display or with adjustment device or PC software.


Constant value mode

  • In operating mode F (constant value mode), an analogue signal on terminal Y is not required.
  • The set duct pressure constant value Pmin is used.
  • Operating value Pmin is pre-set in the factory according to the order code entry.
  • Subsequent adjustment of Pmin can be adjusted in the adjustment menu on the display or with adjustment device or PC software.

 
Actual value as feedback for monitoring or tracking control

  • The actual duct pressure measured by the controller can be tapped as a voltage signal at terminal U.
  • The selected signal voltage range 0 – 10 V DC or 2 – 10 V 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 the control signal is Y < 0.5 V DC.
  • With signal voltage range 2 – 10 V DC: CLOSED is activated when control signal is Y < 0.8 V DC (0.8 V = factory setting).
  • The specified switching point of 0.8 V corresponds here to the factory default setting.


Override controls for diagnostic purposes

  • For test purposes, the override control can also be activated via the integral display, adjustment device or PC software.


Prioritisation of various setting options

  • High priority: settings via the display, adjustment device or PC software
  • Low priority: settings via wiring on the Y signal input of the controller


Spring return actuator

  • The spring return function in case of power failure is prepared at the factory according to the order option. NC = damper CLOSED, NO = damper OPEN. On site, this function cannot be changed by parameterisation via service tools.

 


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