Siemens 125-1957 Applications, Basic Operation, Control Temperature Setpoints, Day/Night Mode

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Applications

Basic Operation

The Unit Vent Controller⎯0 to 10V Output provides Direct Digital Control (DDC) technology for unit ventilator applications. The applications available in this controller are as follows:

•Heating and/or Chilled Water Cooling, ASHRAE Cycles l and II

•Heating and/or Chilled Water Cooling, ASHRAE Cycle III

•Heating and DX Cooling, ASHRAE Cycles I and II

•Heating and DX Cooling, ASHRAE Cycle III

•Nesbitt Cycle W

•Slave Mode (no control; available for set up, and point extension device)

Application 2281

Application 2283

Application 2284

Application 2286 Application 2287

Application 2299

Control Temperature Setpoints

The controller maintains a specified temperature setpoint based on Day/Night mode, the heating/cooling mode, or the setpoint dial (if used).

Day/Night Mode

The controller maintains the specified day setpoint temperature during daytime hours and the specified night setpoint at night.

Day Heating Operation

The controller maintains the room temperature by resetting the unit ventilator's discharge temperature setpoint (2281/2284), modulating the available coil control device, controlling auxiliary radiation (if provided), positioning the outdoor air or face-bypass damper.

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Siemens Building Technologies,Inc.

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Contents Apogee Unit Vent Controller ⎯ 125-1957 Rev. CA, JulyPage Service Statement Page Table of Contents Point Database Troubleshooting Table of Contents How To Use This Manual Manual OrganizationManual Symbols Notation Symbol MeaningManual Conventions Datamate SoftwareWhere To Send Comments Getting HelpProduct Overview IntroductionOrdering Notes Standard ApplicationsAnalog Hardware InputsDigital Power Wiring Communication WiringHardware Outputs Analog 0 toTemperature Sensors Controller LED IndicatorsRoom Temperature Sensor Mixed Air/Discharge Air Temperature Sensor ActuatorsDamper Actuators Valve ActuatorsControl Temperature Setpoints Day/Night ModeApplications Basic OperationHeating and Cooling Switchover Valve ConfigurationControl Loops Morning Warm-up/Cool-down ON/OFF Coil Valve ControlElectric Heat Fan OperationBasic Operation Application 2281 Control Drawing Application 2281 Control Drawing Application 2281 Control Drawing Application 2283 Control Drawing Application 2283 Control Drawing Application 2283 Control Drawing Application 2284 Heating and DX Cooling, Ashrae Cycles I Application 2284 Control DrawingApplication 2284 Heating and DX Cooling, Ashrae Cycles I Application 2286 Heating and DX Cooling, Ashrae Cycle Application 2286 Control DrawingApplication 2286 Heating and DX Cooling, Ashrae Cycle Application 2287 Heating and Cooling Nesbitt Cycle W OverviewApplication 2287 Heating and Cooling Nesbitt Cycle W Application 2299 Slave Mode Point Database Descriptor Address Application DescriptionWall Switch RM Stpt MINRM Stpt MAX RM Stpt DialOvrd Time NGT OvrdAUX.NOAUX Free CLGAOV1SPAN AOV1STARTAOV2 Span AOV2 StartNGT CLG Mode EheatEhea T FANCLG Output OA Dmpr POSCLG P Gain CLG D GainSwitch Limit Switch TimeMA Loopout OA LoopoutSwitch Dband Error StatusNGT Dband Morn DbandBasic Service Information TroubleshootingOverview Ordering Replacement Parts Preventive MaintenanceSafety Features Controller LEDsGlossary AlgorithmCentralized control Control loopEnglish units Equipment controllerField panel InterceptOverride switch Slave modeOn text Sl unitsUnbundle Index BST LEDDDC FLNRTS TX LED

125-1957 specifications

Siemens 125-1957, a notable creation of the German engineering giant Siemens, is recognized for its innovative design and advanced technology in the realm of electrical engineering. This model is emblematic of the mid-20th century's commitment to optimizing electrical machinery for industrial applications, contributing to enhanced productivity and efficiency.

One of the main features of the Siemens 125-1957 is its robust construction, designed to withstand the demanding environments of industrial settings. The body of the machine is built from high-grade materials, ensuring durability and longevity. It is also designed to minimize vibration and noise during operation, thus enhancing the user experience.

Technologically, the Siemens 125-1957 incorporates advanced electric motor technology, which provides reliable performance across a variety of applications. The motor is designed for high efficiency, allowing it to operate effectively under load while consuming less energy. This efficiency is crucial in industrial applications where operational costs are significant. The motor is also equipped with thermally protected windings, which prevent overheating and extend the service life of the equipment.

The 125-1957 model is characterized by its adaptability in various operational settings. It is compatible with a range of automation systems, making it a versatile choice for factories and production lines. Its design allows for easy integration with existing equipment, minimizing downtime during installation.

Moreover, the Siemens 125-1957 boasts a user-friendly interface, making it accessible for operators with varying levels of expertise. It comes with comprehensive safety features, including circuit protection and emergency stops, ensuring that it meets the strict industrial safety standards.

In summary, the Siemens 125-1957 represents a blend of robust design, advanced motor technology, and user-oriented features. With its energy-efficient performance and adaptability, it stands out as a key asset in industrial electrical engineering, demonstrating Siemens' commitment to innovation and quality in the manufacturing sector. This model continues to be relevant, supporting various industries in their pursuit of efficiency and reliability.
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