Fan Operation | Siemens 125-5050 guide

Chapter 2 – Applications

Application 2864 VAV Series Fan Powered with Electric Reheat

In Application 2864, the controller modulates the supply air damper of the terminal box for cooling and controls stages of electric reheat for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. Application 2864 has a series fan for air circulation. In order for the terminal box to work properly, the central air-handling unit must provide supply air.

See the following figure.

Fan Operation

	CAUTION
	On series fan powered terminal boxes, the terminal box fan must be
	controlled/interlocked to start either before or at the same time as the central air
	handler. Failure to do so may cause the terminal box fan to rotate backwards and
	cause consequent damage at start up.
	In day mode, the fan is ON all the time. In night mode, the fan cycles on when heating
	or cooling is required.
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Siemens Industry, Inc.	BACnet ATEC Owner's Manaul
125-5050, Rev. AA	4/20/2010

Image 19

Siemens 125-5050 owner manual Application 2864 VAV Series Fan Powered with Electric Reheat, Fan Operation

Contents

Siemens Industry, Inc Siemens BACnet AtecPage Copyright Notice Service StatementFCC Regulations Credits To the Reader Table of contents Using the Controller as a Point Extension Device Manual Organization How To Use This ManualManual Conventions Where to Send Comments Manual SymbolsGetting Help Application Description Product OverviewOrdering Notes BACnet Atec Electronic Output Applications Digital Hardware InputsHardware Outputs Analog Application Power Wiring Indication Communication WiringController LED Indicators Controller LEDs Related Equipment Temperature SensorsRoom Temperature Sensor Duct Temperature Sensor Basic Operation Applications Fail-safe Operation Heating and Cooling SwitchoverCalibration Damper Status Operation Hot Water Reheat Modulate Damper During Heating Mode optionalElectric Reheat Application 2861 VAV Cooling or Heating Application 2860 VAV Cooling Only Baseboard Radiation Application 2863 VAV with Hot Water ReheatElectric Heat Interlock Fan Operation Application 2864 VAV Series Fan Powered with Electric Reheat Insert TEC2564CD Insert TEC2566CD Insert TEC2567CD Application 2897 Slave ModeUsing Auxiliary Points Using the Controller as a Point Extension Device Applications Descriptor Address Application Description Point Database Descriptor Address1 Descriptor Address1 Application Description MTR2 Timing MTR SetupVLV POS VLV1 POS CTL Flow MIN Switch LimitSwitch Time Flow Setup Switch DbandCAL Setup CAL Timer Basic Service Information Chaper 4 TroubleshootingPreventive Maintenance Controller LEDs Safety Features Glossary Loopout Override switchField panel Lps Unbundle Slave modeStand-alone control Terminal Equipment Controller Index Duct temperature sensor, 15 RTS Index Communication wiring Wiring Power wiring 125-5050, Rev. AA