Siemens Official Manual for the Nesbitt Unit Ventilator
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APOGEE Unit Vent Controller⎯0 to 10 V Output Owner’s Manual

Application 2287 – Heating and Cooling,

Nesbitt Cycle W

Overview

In Application 2287, the Unit Vent Controller⎯0-10V Output controls a unit ventilator equipped with a heating coil, which may be hot water or steam, for Nesbitt Cycle W. Auxiliary radiation coils are piped parallel to the heating coil and are not controlled separately by the application. A chilled water coil or a DX cooling coil may be controlled. Heating only units can also be controlled with this application by overriding HEAT.COOL (Point 5) to HEAT.

Other features available in this application include morning warm-up/cool-down, night mode override and free cooling.

NOTE: The use of a low temperature detection thermostat (LTDT) is strongly recommended for hot water and steam systems.

This application controls room temperature by directly modulating the coil control device(s) and the outdoor air damper according to the schedule defined by Nesbitt Cycle W. The free- cooling/economizer function is turned on and off by the field panel using FREE CLG (Point 23). The unit ventilator fan is also controlled in this application.

Figure 20. Application 2287 Control Drawing.

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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 Conventions Manual SymbolsNotation Symbol Meaning Datamate SoftwareWhere To Send Comments Getting HelpOrdering Notes Product OverviewIntroduction Standard ApplicationsHardware Inputs AnalogDigital Hardware Outputs Power WiringCommunication Wiring Analog 0 toController LED Indicators Temperature SensorsRoom Temperature Sensor Damper Actuators Mixed Air/Discharge Air Temperature SensorActuators Valve ActuatorsApplications Control Temperature SetpointsDay/Night Mode Basic OperationValve Configuration Heating and Cooling SwitchoverControl Loops Electric Heat Morning Warm-up/Cool-downON/OFF Coil Valve Control 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 DescriptionRM Stpt MAX Wall SwitchRM Stpt MIN RM Stpt DialAUX.NOAUX Ovrd TimeNGT Ovrd Free CLGAOV2 Span AOV1SPANAOV1START AOV2 StartEhea T NGT CLG ModeEheat FANCLG P Gain CLG OutputOA Dmpr POS CLG D GainMA Loopout Switch LimitSwitch Time OA LoopoutNGT Dband Switch DbandError Status Morn DbandTroubleshooting Basic Service InformationOverview Safety Features Ordering Replacement PartsPreventive Maintenance Controller LEDsCentralized control GlossaryAlgorithm Control loopField panel English unitsEquipment controller InterceptOn text Override switchSlave mode Sl unitsUnbundle DDC IndexBST LED 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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