Variable air volume controllers
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LMV-D3-MOD
NMV-D3-MOD
VAV-Compact MOD
A pressure sensor, digital VAV controller and damper
actuator all in one, providing a VAV-Compact
solution with a communications capability for
pressure-independent VAV systems in the comfort
zone
• Control function: VAV
• Communication via Modbus RTU (RS-485)
• Conversion of sensor signals
• Diagnostic socket for operating devices
Brief description
Application
The digital VAV-Compact has PI control characteristics and is used for pressure-independent
control of VAV units in the comfort zone.
Mode of operation
The actuator is fitted with an integrated interface for Modbus RTU, receives its digital
positioning signal from the superordinate Modbus-Master and returns the current status.
Converter for sensors
Connection option for a sensor (passive or active sensor or switching contact). In this way,
the analogue sensor signal can be easily digitised and passed along to Modbus.
Parameterisable actuators
The factory settings cover the most common applications. As desired, individual parameters
can be adapted for specific systems or servicing with a service tool (e.g. ZTH-GEN).
The Modbus communication parameters (address, baud rate, …) are set with the ZTH-GEN.
Pressing push-button 3 while connecting the supply voltage resets the communication
parameters to the factory setting.
Quick addressing: The Modbus address can alternatively be set using push-buttons from
1 to 16. The value selected is added to the «Basic address» parameter and results in the
effective Modbus address. For example, with a basic address of 140, Modbus addresses
between 141 and 156 can be parameterised using quick addressing.
Pressure measurement
Maintenance-free, dynamic, differential pressure sensor, proven in a wide range of
applications, suitable for use in offices, hospital wards, alpine hotels or cruise liners.
Actuator
Two versions are available, depending on the size of the VAV unit: 5 or 10 Nm.
VAV – variable volumetric flow
The VAV-Compact is supplied with its modulating setpoint by a room temperature controller
via Modbus. This facilitates demand-related, power-saving ventilation in individual rooms or
zones of air conditioning systems. The operating range (
min and
max ) can be set either
locally with PC-Tool or ZTH-GEN or via Modbus.
Operating and service devices
Belimo PC-Tool or Service-Tool ZTH-GEN, pluggable on the VAV-Compact.
Assembly and connection
The VAV-Compact device, which is assembled on the unit by the OEM, is connected using the
prefabricated connecting cable.
OEM factory settings
The VAV-Compact is mounted on the VAV unit by the unit manufacturer, who adjusts and
tests it according to the application. The VAV-Compact is sold exclusively via the OEM
channel for this reason.
Type listing
Type
Torque Power consumption For wire sizing
Weight
LMV-D3-MOD 5 Nm
2 W 4 VA (max. 5 A @ 5 ms) Approx.
500 g
NMV-D3-MOD 10 Nm
3 W 5 VA (max. 5 A @ 5 ms) Approx.
700 g
