Danfoss PTU 025 Fact sheet

Fact sheet | VLT® Pressure Transmitter PTU 025

Optimized airflow control

saves energy and improves indoor climate

Optimize indoor climate

Optimizing indoor climate in for instance
office buildings or hospitals will ensure
a healthy work environment for optimal
staff performance and increase overall
well-being for both staff and patients by
ensuring access to clean and fresh air.

The VLT® HVAC Drive FC 102 has a built-in
airflow controller. Combining the control
with the filter monitoring, via the
VLT® Pressure Transmitter PTU 025, will
create a solution that is easy to install and
that provides great indoor climate with
minimal energy consumption.

Save energy and costs

Cut operation costs by ensuring airflow
based on the actual demand and system
design – whether this is based on the
airflow through the fan or the pressure in
the connected air distribution system.

The control solution can handle different
control logics from simple pressure
measurement to advanced flow or pressure
control in air-handling units (AHUs)/roof
top units (RTUs).

Four PID loops for full control

The FC 102 has a total of four PID loops to
support different air conditioning needs
in the AHU/RTU, e.g. heating, cooling,
humidification, or energy recovery.
The advanced, programmable smart logic
controller with four independent control
loops will cover many simple AHU/RTU
control solutions.

Easy to install

The VLT® Pressure Transmitter is fast and
easy to install, commission and operate.
Avoid complexity in installation and system
integration thanks to the simplicity of this
compact design. It is built specifically for
AHU and RTU applications, for reliable
operation both indoors and outdoors.

Communicate seamlessly

When combined into a single unit,
the VLT® Pressure Transmitter and the
VLT® HVAC Drive ensure that airflow
and pressure level are handled by
the drive according to predefined
control parameters and sensor inputs.
Communication to the connected network
or building management system (BMS) is
automatic and seamless.

Mount VLT® Pressure Transmitter PTU 025 directly
onto the VLT® HVAC Drive FC 102 enclosure, and
connect easily to achieve seamless BMS integration.

Ensure

clean

air and win the
benefits of an optimal
indoor climate

Features Benefits

Optimizes energy consumption by aiding correct
airflow and pressure in air distribution system.

Easy to install, with dedicated software for airflow
control in different combinations.

Three additional PID controllers for special
requirements in the actual application, like integrated
controller for air conditioning in AHUs and RTUs,
for instance heating or cooling.

Connects to building management system (BMS)
via network, analog interface, or digital and
relay outputs.

4 pressure sensors. Monitoring of filter and airflow in one unit.

Reduces operating costs to demand.

Complexity reduction.
Easy control and monitoring on the local control
panel of the VLT® HVAC Drive or via fieldbus network.

Reduce installation cost and complexity with the
built-in software features.

Easy to harvest, correlate and present
performance data.

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Electrical connection

The VLT® Pressure Transmitter PTU
025 module is easily integrated into
the VLT® HVAC Drive, and suitable for
IP55/66 enclosures. It is easily mounted
onto the enclosure of the VLT® HVAC
Drive, and suitable for retrofitting
existing drives.

Ordering number

Order with code number 134B5925. Includes pressure transmitter with tube relief
and internal C-option connection cable with cable binder.

Specifications

System integration

 Sensors 1 and 2; working area of 0-500 Pa.

Pressure sensor inputs

Pressure sensor outputs

Control method

Communication

Compatibility

Control parameterization

Differential air pressure flow control

Pressure level flow control

Performance

Measuring accuracy

Environment

Temperature Range -25 to +50 °C

IP class IP66

 Sensor 3; working area of 0-1000 Pa.
 Sensor 4; working area of 0-2500 Pa.

5 mm pressure tube tap connection and holder
for the tubes.

Pressure signals on fieldbus and digital output,
relay or as analogue values.

Airflow control with closed-loop PID regulator on
air volume or pressure level in air channel.

Data communication via different fieldbus
networks.

VLT® HVAC Drive FC 102 with minimum software
version 5.12. Retrofit solution with minimum MK II
new control card for older version.
Internal connection to C-option slot on
VLT® HVAC Drive FC 102.

Use the capacity K-factor, provided by the
AHU/RTU manufacture for the fan, to control
the demanded airflow, or provide detailed
information of the AHU/RTU to calculate the flow.

Define the pressure level the AHU/RTU must
provide to the air distribution ducting.

Pressure compensated to altitude, and absolute
accuracy of ± 2.5% of sensor FS value and
temperature range.

SENSOR 4

Example of installation: The supply and exhaust

air strings in the AHU are controlled by separate

VLT® HVAC Drives measuring in total seven pressure

DKDD.PFM.104.A1.02 © Copyright Danfoss Drives | 2021.08

points in the AHU.

SENSOR 1

SENSOR 2

SENSOR 1

SENSOR 4

SENSOR 3 SENSOR 3