WILDEBOER DKpro Pressure Controller User Manual

WILDEBOER DKpro Pressure Controller

Quick setup and operation

1. Install the DKpro pressure controller position-independently in the air direction indicated on the label, using a tension-free installation to ensure lasting function and leak tightness.
2. Allow sufficient space around attachment parts for commissioning and servicing access.
3. Connect the electrical/control connections required for the selected operating modes (constant, variable, overrides, or sequential/parallel operation).
4. Apply power. With blades supplied factory-open, operation begins when sensor signals indicate the differential pressure is above Plimit.
5. Adjust reference pressure and operating parameters on site using the Link.10 setting device (or via compatible communication software with PC or smartphone).
6. If using optional volumetric flow rate measurement or pressure tapping, connect the supplied hoses to the measuring/pressure tapping interfaces as described in the operating instructions.

Product overview

DKpro pressure controllers regulate the pressure in ventilation ducts or rooms using a controller with an integrated sensor and an actuator. The controllers have LED status indicators and a service port, while the actuators have a manual adjustment function. With the dynamic sensor, a small amount of air flows through the sensor. It is proportional to the static pressure in the ventilation duct or the room. There is a thermal detection in a measuring chamber. There is no flow through static sensors. The static pressure present at the pressure tapping point downstream of the DKpro pressure controller, or the static pressure present in a room, is directed into a diaphragm measuring chamber and detected inductively. In addition to a selection of controllers and actuators, optional acoustic insulation is available.

Specification

Specification	Description
On-Site Adjustment	Can be set on site
Installation	Position-independent installation
Design	Maintenance-free design
Size Range (W × H)	200 × 100 mm to 1000 × 1000 mm
Length (L)	250 mm
Casing Leak Tightness Class	ATC 3 (formerly Class C) according to DIN EN 1751
Damper Blade Leak Tightness Class	Class 4 according to DIN EN 1751
Maximum Differential Pressure	1000 Pa
Differential Pressure Control Range	5 … 1000 Pa
Differential Pressure Sensor Options	Dynamic up to 500 Pa or Static up to 75 / 600 Pa
Volumetric Flow Rate Control Range	72 … 36000 m³/h
Flow Velocity Range	1.0 … 10 m/s
Voltage Supply	24 V AC/DC, -10% to +20%
Communication Interface	Analogue, bus-compatible (MP-Bus, Modbus, BACnet)
Actuator Options	Standard speed, high speed, or spring return for emergency operation
Operating Temperature	0 … +50 °C
Protection Rating	IP42 according to DIN EN 60529
Hygiene Certificate	W-408912-25-JRoll, issued by Ruhr District Institute of Hygiene
Environmental Product Declaration	EPD-WIL-20230373-ICA1-DE, issued by Institut Bauen und Umwelt e.V.
Operating Modes	Constant, variable (0 … 10 V, 2 … 10 V adjustable), overrides, parallel operation, and sequential circuits
Factory Presets	Available
Acoustic Insulation Option	Acoustic insulation with sheet metal jacket
Sound Attenuator Option	SKE-V sound attenuator
Pressure Measurement Option	Pressure tapping set
Flow Measurement Option	Volumetric flow rate measuring device, dynamic or static

Product features

Actuators

• Various actuators, differentiated by run mode/runtime:
• Standard speed High speed Spring return
• 120 s
• 4 s / 7 s
• 120 s, 20 s spring

Controller
Different controllers, differentiated by sensor and measuring method:
Static dynamic

• Diaphragm measuring method
• Thermal measurement method

Dimensions

Width W [mm]	Height H [mm]	Inflow Cross Section Aₐ [m²]	Min. … Max. Volumetric Flow Rate V̇ [m³/h]
200	100	0.020	72 … 720
200	200	0.040	144 … 1440
300	100	0.030	108 … 1080
300	200	0.060	216 … 2160
300	300	0.090	324 … 3240
400	100	0.040	144 … 1440
400	200	0.080	288 … 2880
400	300	0.120	432 … 4320
400	400	0.160	576 … 5760
500	100	0.050	180 … 1800
500	200	0.100	360 … 3600
500	300	0.150	540 … 5400
500	400	0.200	720 … 7200
500	500	0.250	900 … 9000

Product features

Width W [mm]	Height H [mm]	Inflow Cross Section Aₐ [m²]	Min. … Max. Volumetric Flow Rate V̇ [m³/h]
600	100	0.060	216 … 2160
600	200	0.120	432 … 4320
600	300	0.180	648 … 6480
600	400	0.240	864 … 8640
600	500	0.300	1080 … 10800
600	600	0.360	1296 … 12960
700	200	0.140	504 … 5040
700	300	0.210	756 … 7560
700	400	0.280	1008 … 10080
700	500	0.350	1260 … 12600
800	200	0.160	576 … 5760
800	300	0.240	864 … 8640
800	400	0.320	1152 … 11520
800	500	0.400	1440 … 14400
800	600	0.480	1728 … 17280
800	800	0.640	2304 … 23040
900	300	0.270	972 … 9720
900	400	0.360	1296 … 12960
900	500	0.450	1620 … 16200
1000	300	0.300	1080 … 10800
1000	400	0.400	1440 … 14400
1000	500	0.500	1800 … 18000
1000	600	0.600	2160 … 21600
1000	800	0.800	2880 … 28800
1000	1000	1.000	3600 … 36000

Accessories

Acoustic insulation with sheet metal casing to reduce the external sound radiation (radiated noise). Optional accessories, preassembled in the factory

Volumetric flow rate measuring device for measuring and displaying the actual volumetric flow rate and for subsequent controls. Optional accessories for on-site installation

SKE-V sound attenuator for reducing flow noise in the connected ventilation duct. Optional accessories for on-site installation

Link.10 setting and diagnostics tool for convenient configuration, commissioning and fault diagnosis. Optional accessories

Pressure tapping set for detecting the static pressure in the ventilation duct upstream and downstream of the pressure controller. Optional accessories for on-site installation

BS2-VR-01 volumetric flow rate and pressure controller module for functional upgrade as a result of integration into the Wildeboer-Net communication system. Optional accessories

Some of the accessories depend on the size. For reliable selection and to determine the appropriate order data, the web application Wildeboer Connect is recommended Wildeboer Connect.

Product description
DKpro pressure controllers are maintenance-free electronic controllers for constant and variable pressures in ventilation and air conditioning systems or corresponding rooms. They can be installed and operated in any installation position in ventilation ducts for supply and exhaust air.

The casing and control mechanism are made of galvanised sheet steel. The blades for volumetric flow rate control are centrally supported and equipped with a seal. The bearing axles are made of stainless steel and are guided in special plastic bearing bushes. The measuring cross is made of aluminium. The measuring cross is only required for the optional volumetric flow rate measuring device, which is available for retrofitting. Otherwise, the connections are closed.

The control components comprise a controller with integrated static or dynamic sensor and an actuator with standard, quick or spring return. The controller with integrated sensor is mounted on an attachment console which can be tilted or offset manually in confined spaces.

Control and electrical connection of the DKpro pressure controller are analogue, by MP-Bus, BACnet or Modbus. All control components facilitate the operating modes “constant” and “variably adjustable 0 … 10 V, 2 … 10 V”. Overrides, parallel operation and sequential circuits are possible.

Constant or variable set points which can be referenced as overpressure or negative pressure are specified. The differential pressure is measured. The positioning angle of the blades is then used for pressure control.
Factory settings can be ordered. Modifications by the user can be made using a setting device, including in conjunction with a PC or the integrated NFC interface with a smartphone.

Item No.	Description
1	Duct Casing
2	Actuator
3	Sensor and Controller with Detachable Attachment Console
4	Blades
5	Measuring Cross
6	Service Socket for Setting Device
7	Acoustic Insulation with Sheet Metal Jacket (Optional)

Hygiene
DKpro Pressure controller

• meet the hygiene requirements according to VDI 6022-1, VDI 3803-1, DIN 1946-4, DIN EN 16798-3, SWKI VA104-01, SWKI VA105-01, ÖNORM H6020, ÖNORM H6021,
• are resistant to microbes, so they do not promote the growth of micro-organisms (fungi, bacteria),
• are resistant to cleaning agents and disinfectants,
• are suitable for cleaning and satisfy the requirements for surface and geometric design

Accuracy
DKpro pressure controllers make for high accuracy with only around ± 5 %… ± 10 % deviation from the actual pressure. The sensor-related pressure ranges Pstart to Pnom and the pressures preset for ventilation ducts or rooms are held constant within the hysteresis.

Pressure Range Sensor Type	Dynamic Sensor	Static Sensor (Up to 75 Pa)	Static Sensor (Up to 600 Pa)
Plimit [Pa]	25	4	30
Pstart [Pa]	25	8	60
Pnom [Pa]	500	75	600

Function of pressure control

DKpro pressure controllers control the static pressure in a ventilation duct or in a room to a specified set point. This set point can be constant, variable or specified by a reference variable. The control is based on a differential pressure measurement compared to a reference pressure.

The control process closes or opens the blades in the pressure controller casing to a greater or lesser extent. This results in a change in the static pressure drop pS.
As a result of the pressure drop, the pressure upstream of the pressure controller is always higher than the pressure downstream. The “primary pressure” generated by a fan is reduced to the “duct pressure” downstream of the pressure controller. Its actual value is measured at the pressure tapping point.

The actual value should correspond to the specified reference pressure Pref within the designated tolerances. The tolerance is made up of the sensor accuracy plus the control hysteresis = dead band ± 5 % Pnom. If the actual pressure deviates from the reference pressure by more than the control hysteresis specifies, the control system intervenes. A corresponding blade adjustment ensures that the actual pressure is returned to the tolerance range.

Area of application
A prerequisite for proper functional control is that the degree of throttling of the blades must be within a range suitable for the application. In principle, the DKpro pressure controller should therefore be engineered to have the lowest possible pressure drops, not only from an economic perspective but also from a technical one.

Function of operating modes
The use of the operating modes requires the necessary electrical connections and the setting of the corresponding parameters. Pressure control begins as soon as the sensor signals to the controller that the differential pressure is above Plimit.
Setting the reference pressure from Pstart leads to the specified accuracy in the pressure range up to Pnom. This must be taken into account for serviceable control in the lower pressure range.

Constant
For Pmin ≤ Pnom, a reference pressure is set. The purpose of this is to keep the controller constant.

Variable
With Pmin < Pmax or Pmin = 0 [Pa] and Pmax ≥ 20 % Pnom, a reference pressure range is set. Within it, the reference pressures Pref to be kept constant by the controller can be specified by a command signal Y [V]. It is applied to terminal 3.
For bus operation, see page 22.

Override

• Overrides require electrical connections with 24 V AC/DC voltage signals on terminals 11 and 12. Analogue and bus controls can be used.
• The signals override all operating modes and allow the blades to open or close fully. Additionally, the operating levels motor stop and Pmax can be forced. See page 22.

Actual value signal U

• For analogue or BACnet / Modbus operation of the pressure controllers, an actual value signal U proportional to the actual pressure Pact is available on terminal 5 for external pressure display and as a command signal for sequential circuits.
• It is proportional to the maximum pressure Pnom and independent of the settings on the pressure controller.
• The voltage range can be set from
• LL = 0 … 8 V DC to UL = 2 … 10 V DC.

Stand-alone operation, parallel operation and master-slave sequential operation – examples

• With stand-alone operation, the pressure controller is set to one of the possible operating modes.
• With parallel operation, this affects two or more. The command signals are always identical and are connected electrically individually or in parallel to terminal 3 (command signal Y). When connected in parallel, controllers operate independently of one another. Reference pressures Pmin and Pmax can be set independently of each other and according to the size and operating modes of the controllers. Changes to one controller have no effect on the others.
• With master-slave sequential operation, the actual pressure Pact of one controller controls the reference pressure Pref of the others. a
• In the case of analogue control, the actual value signal U from terminal 5 of the master controller is fed as the command signal Y to terminal 3 of the slave controllers.
• If the master is set to “variable 0 … 10 V”, “variable 2 … 10 V” or “variable adjustable”, the same mode must be set on the slave. If a master operates in “constant” mode, the slave must be operated in “variable” mode and must be matched to the master’s output signal (0 … 10 V or 2 … 10 V).

Example 1: Stand-alone operation of the pressure controllers (static sensor up to 600 Pa) and parallel operation with identical pressure

Example 2: Parallel operation of the pressure controllers (static sensor up to 600 Pa) with constant pressure difference
Example 3: Parallel operation of the pressure controllers (static sensor up to 600 Pa) with equal-percentage pressure difference.

Applications
Preparation for pressure control:
A mandatory prerequisite for functioning pressure control using the DKpro pressure controller is a tapping point to be provided on site for the measurement of the static pressure to be regulated. It is required for both duct pressure control and room pressure control.

• Duct pressure control
  When it comes to duct pressure control, the DKpro pressure controller is ideally supplemented with the optionally available pressure tapping set. The static pressure to be regulated in the duct is captured by the pressure tapping point and fed to the differential pressure sensor of the DKpro pressure controller via the hose, which has to be laid on site.
• Duct pressure control is carried out as differential pressure control. The ambient pressure in the vicinity of the pressure controller serves as the reference pressure. For this purpose, the respective sensor connection remains free. For duct pressure control, sensors with measuring ranges of up to 500 Pa or 600 Pa are recommended.
• The hose connection on the sensor is different for positive pressure or negative pressure control. See the operating instructions and installation instructions

For solid pressure control, the pressure tapping point in a ventilation duct must be installed in a suitable position at a sufficient distance from obstructions. See page 15

Room pressure control:

• When it comes to room pressure control, the static pressure to be regulated in the respective room is detected using a room pressure sensor and fed to the differential pressure sensor of the DKpro pressure controller via a hose which has to be laid on site. For room pressure control, a sensor with a measuring range up to 75 Pa is recommended.
• The pressure tapping point in the room must be positioned so that the pressure is detected without turbulence and is thus not adversely affected by any room currents. Each application must always be considered individually. It is often advisable to capture the static pressure in the area of the room ceiling. See page 15
• Room pressure control is also carried out as a differential pressure measurement; a position with stable ambient pressure must be chosen as the reference pressure, e.g. an unventilated room or the external atmospheric pressure independent of wind pressure.

Supplementing the DKpro pressure controller with a volumetric flow rate measuring device:

• The DKpro pressure controller can optionally be retrofitted with the VD or VS volumetric flow rate measuring device. It is used to determine the actual volumetric flow rate and thus makes it possible to dispense with complex network measurements when calibrating a ventilation system.
• In system operation, the actual volumetric flow rate can, for example, be used for a possible sequential control or can be transmitted to a higher-level building control system. The actual value signal U is set to 0 … 10 V in the factory.
• The on-site connection to the measurement cross of the DKpro pressure controller is made using the supplied hoses.

Reliable and noise-optimised operation of volumetric flow rate limiters
The use of DKpro pressure controllers in ventilation ducts ensures optimised and reliable operation of volumetric flow rate limiters. At the same time, acoustic optimisation can be performed. In the application example, the DKpro pressure controller is used for this purpose in the secondary line of a supply air duct network. It regulates and limits the static positive pressure. Pressure fluctuations in the upstream duct network are offset, and the reference pressure Pref in the secondary line is kept constant. This control system thus ensures the reliable operation of the volumetric flow rate limiters within their application limits.

This means that both the minimum differential pressure is maintained and protection from excessive mechanical strain due to excessively high differential pressures is provided. If operation of the volumetric flow rate limiters can be limited to low pressure drops, this also has a positive effect on noise levels. Flow noise from the volumetric flow rate limiters in the branches, and thus the sound pressure level in the room, are minimised, meaning that the sound attenuators which are otherwise usual in the branches, can be omitted.

The reference pressure Pref to be regulated is determined within the scope of the system engineering with the corresponding duct network calculation. The reference pressure in the application shown should be regulated at the start of the secondary line. It should be selected so that the volumetric flow rate limiter in the branch with the lowest duct losses operates reliably within its permissible differential pressure range. In addition, the volumetric flow rate limiter in the branch with the greatest duct losses must still be able to limit the set volumetric flow rate.

Application example
The actuator is a high-speed design that is combined with a controller with an integrated dynamic sensor for up to 500 Pa. The volumetric flow rate for each air diffuser is calibrated automatically by the volumetric flow rate limiters; this can also be performed manually using dampers.

In the example, the pressure generated by the fan, minus the duct pressure drops, initially continues to all DKpro pressure controllers. They regulate and limit the static positive pressure in the secondary lines to 100 Pa. Pressure fluctuations in the duct network upstream of the pressure controllers are offset.

Thus, pressures in the range of 85 to 45 Pa are present in the branches of all secondary lines. This ensures that the pressure drops of all volumetric flow rate limiters, at 70 to 30 Pa, always remain within the permissible application range, and at the same time, the pressure drops are limited to low values, which leads to low flow noise. Sound attenuators in the branches are not required. Flow noise in the secondary lines can be reduced if necessary by using the optionally available SKE-V sound attenuators.

Accessories
Acoustic insulation with sheet metal jacket

For further technical data, see WiDim

SKE-V sound attenuator
The SKE-V sound attenuator for reducing flow noise is supplied separately. Assembly is performed with the pressure controller on site.

For further technical data, see the user manual for SKE or WiDim.

Link.10
Universal setting and diagnostics tool for actuators and controllers. It serves as a Bluetooth and USB-to-NFC and MP-Bus converter, enabling user-friendly configuration, commissioning and fault diagnosis.

Volumetric flow rate measuring device
Volumetric flow rate measuring device for measuring and displaying the actual volumetric flow rate and for subsequent controls. It comprises a console with a controller with an integrated dynamic or static sensor. The measurement cross included in the pressure controller must be connected using the supplied hoses.

Pressure tapping set
Pressure tapping set for detecting the static pressure in the ventilation duct upstream and downstream of the pressure controller. It comprises the pressure tapping point, the push-on tube for bridging walls with insulation with a thickness of up to 80 mm, 3 m of hose for connection to the sensor of the DKpro pressure controller, fastening screws and a seal.

Installation

The DKpro pressure controller is installed position-independently and in the air direction indicated on the label. To ensure lasting function and leak tightness, tension-free installation in ventilation ducts is a prerequisite.

Space requirement
To enable the commissioning and servicing work to be carried out, sufficient space should be kept free in the area of any attachment parts. Inspection openings of sufficient size may required so that the attachments are easily accessible.

Installation information/clearances to obstructions

Installation instructions are supplied together with delivery of the DKpro pressure controller, and must be observed.

• DKpro pressure controllers are designed for ventilation and air conditioning systems. Suitable air purity is a prerequisite for operation.
• DKpro pressure controllers are parametrised for the entire controllable pressure range from Pstart to Pnom and achieve the specified accuracy in this range. Greater fluctuations can occur at low pressures.
• Optimum function of the DKpro pressure controllers in duct pressure control requires a suitable placement of the pressure tapping point on the ventilation duct. When supplementing the pressure controllers with a volumetric flow rate measuring device, the straight upstream and downstream sections shown in the examples should be adhered to as a minimum downstream of obstructions.
• When it comes to duct pressure control, multiple obstructions in a row can be compensated for by shifting the pressure tapping point; for determining the volumetric flow rate, a longer upstream section may be required in this case; otherwise, greater fluctuations must be expected.

For room pressure control, the pressure tapping points for both the room pressure and the reference pressure must be selected appropriately.

• DKpro pressure controllers can be inserted position-independently.
• DKpro pressure controllers are supplied from the factory with the blades open and with either the standard setting or a customer-specific presetting.
• If there is no system operating pressure, the blades are open. If the pressure increases to the specified set point, the DKpro pressure controllers enter into operation. For application limits, see page 18 and page 19
• The actuators are overload-proof. Standard and high-speed actuators remain in their current position in the event of a power failure. Spring return actuators perform the emergency positioning movement (closing or opening) using a spring. In the process, all settings remain in place.
• On-site changes to the setting values can be made using the Link.10 setting device; additionally, with the appropriate communication software, this can also be performed on a PC or a smartphone.
• DKpro pressure controllers and SKE-V sound attenuators are supplied individually. They are assembled on site; in doing so always align the gap in the splitter at a right angle to the blade axis.

Technical data

Weights
DKpro pressure controller with standard actuator [with acoustic insulation] Weights in kg

• Specifications depending on size
• Specifications depend on the sensor being used

Dimensions

SKE-V sound attenuator

For further technical data, see the user manual for SKE or WiDim.

Sound power level inside the ventilation duct – flow noise

In the above nomogram, the sound power level inside the ventilation duct is dimensioned as an overall level LWA. Octave sound power levels LW-Oct for every size and any required operating point are obtained from the WILDEBOER dimensioning software.
See download at www.wildeboer.de

In the above nomogram, the sound power level inside the ventilation duct is dimensioned as an overall level LWA. Octave sound power levels LW-Oct for every size and any required operating point are obtained from the WILDEBOER dimensioning software.
See download at www.wildeboer.de

Sound power level inside/outside the ventilation duct – examples

• The sound power levels inside the connecting duct are calculated in the nomograms as A-weighted overall levels LWA.
• Corresponding octave sound power levels LW-Oct can be calculated for every size and all operating points using the Wildeboer dimensioning software; also for designs with additional SKE-V sound attenuator.
• With SKE-V sound attenuators, the sound power levels LWA can be reduced by up to 16 dB.

Important:

• The sound levels indicated in the nomograms are stated as sound power levels! They represent the sound energy introduced into the duct system. They are used for acoustic calculations, e.g. when adding sound attenuators.
• In other documents, sound pressure levels Lp or LpA are frequently specified instead of sound power levels. They include general attenuations of up to 21 dB. This distinction must be taken into account when comparing numeric values. Furthermore, the extent of these attenuations only becomes clear once the ducts, baffles, branches and spaces have actually been connected.

Nomenclature

Electrical connection

Constant pressure control

Connection in parallel

Variable pressure control

Sequential circuit

Overrides in operating modes “constant” and “variable”

Bus operation

Specification text

Wildeboer Connect

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WiDim dimensioning software

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Documents online

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Troubleshooting guidance

• Pressure control shows greater fluctuations at low pressures: The source notes that optimum control in the controllable range Pstart to Pnom is parametrised for, while “greater fluctuations can occur at low pressures.” Consider checking operation within the intended pressure range.
• Uncertain duct/room pressure measurement: For duct pressure control, ensure the pressure tapping point placement is suitable. For volumetric flow rate measurement, the straight upstream/downstream sections shown in the examples should be adhered to as a minimum downstream of obstructions; otherwise greater fluctuations may be expected.
• System does not enter pressure control: Verify that the sensor signals to the controller indicate differential pressure above Plimit (pressure control begins once this condition is met).
• Need on-site configuration/diagnostics: Use the Link.10 setting and diagnostics tool for convenient configuration, commissioning, and fault diagnosis; on-site setting changes can also be performed with Link.10 and (where applicable) with PC/smartphone using the appropriate software.

More Info

Find out more at
www.wildeboer.de/downloads