Schneider Electric MR-VAV-AX Specifications

TAC I/NETTM

MR-VAV-AX

Application Speciﬁc MicroRegulator

TAC’s MR-VAV-AX Application Speciﬁc MicroRegulatorTM has an extensive range ofpre-engineered VAV control sequences, which combined with a fully integrated actuator and airﬂow transducer, makes it a low “Total Installed Cost” solution for most VAV terminal unit control applications.

TAC I/NET MR-VAV-AX Application Speciﬁc MicroRegulator Features

An intelligent I/STATTM interface for independent local control and an interface to a TAC I/NET System are standard options.

Distributed Control

PRODUCT AT A GLANCE

• Full y Integr ated Actuato r, Ai rflow Tran sducer

and Controller in a single, low profile package.

• Standalone and Networked Applications

• Extensive VAV Control Sequences:

– Two Stage Heating, Multiple Modes

– Series/Parallel Fan

– Local/Remote Occupancy Override

– Local/Remote Central Plant Heat or Morning

Warm-up Control

– Loc al/Rem ote Shut Down O verride

(fire, failure, etc.)

– Indoor Air Quality Airflow Setpoint Override

– Demand Control Setpoint Override

– Mi nimum a nd Maximum Airfl ow Param eters

for heating and cooling

• Complete “Out-of-the-Box” Installation,

Configuration and Commissioning

– DI P Switc h Confi guratio n and N etwork

Addressing with Local/Remote Override

– Completely mount and secure with one box

screw and two damper shaft screws

– Travel Limit Settings

– Automatic calibration of Airflow and

Temperature Sensors

– Autoconfiguration of Heating Stages

– “Prove It” function for Performance

Verification

– Automatic Database Distribution for

Networked Configurations

– Default Parameter Values

(continued)

Operation

The MR-VAV-AX has been designed to minimize the total installation, setup, conﬁguration and commissioning costs typically associated with VAV controllers.

Installation costs have been reduced by integrating the actuator, airﬂow transducer and controller into a single, low proﬁle, plenum-rated package that can be completely mounted and secured with one box screw and two damper shaft screws.

Setup costs have been reduced by the provision of DIP switches that can be set during installation and before power is applied. For most applications, default parameters will allow the controller to run immediately from startup based on these switch settings.

The MR-VAV-AX is also supplied with an extensive range of pre-engineered and tested control sequences and therefore, no application programming is required. All conﬁguration parameters are pre-installed with the most typical default values. However, they can be overwritten either by an I/STAT, an M/STAT (a portable I/ STAT) or the Operator Station PC. Heating stage setpoints, proportional bands and delays are automatically calculated and set in the controller based on the controller setup selection.

Commissioning costs have been reduced by the use of several automated processes. Airﬂow conversion parameters are automatically calculated once the box duct diameter and the manufacturer’s K-factor are entered. By measuring and entering the low and high airﬂow values for the box, automatic calibration of the installed airﬂow transducer is then performed. Automatic calibration of the temperature sensor is also initiated once a measured value is entered into the controller.

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