Siemens 125-699 owner manual Heating and Cooling Switchover, Electric Reheat, Compressor Operation

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Applications

Heating and Cooling Switchover

The heating/cooling switchover determines whether the controller is in heating or cooling mode by monitoring the room temperature and the demand for heating and cooling (as determined by the temperature control loops).

Electric Reheat

CAUTION:

Verify that the equipment is supplied with safeties by others to ensure that there is airflow across the heating coils when they are to be energized.

The heating loop controls up to three stages of electric reheat (Application 2583) or one stage (Application 2584) to warm up the room. The electric reheat is cycled on and off based on heating demand that is determined by the room temperature heating loop. When the controller is in cooling mode, the electric heat is OFF at all times.

Compressor Operation

When in cooling mode, the output of the cooling loop controls the staging of the compressors and enabling/disabling the mixed air control (used as a source of cooling when the outside air temperature is cool enough.

When in heating mode, the output of the heating loop controls the staging of the compressors or electric heat.

NOTE: Application 2583 only. When cooling or heating mode is opposite the reversing valve control, the compressors are turned off.

Fan Operation

Day Mode – The fan can be set to run all the time or the same as night mode.

Night Mode – The fan is controlled as follows:

The fan will turn ON when at least one of the following two conditions has been met:

•Free cooling is provided by the mixed air control loop.

•At least one compressor or stage of electric heat is ON.

The fan will turn OFF only after the following two conditions have been met:

•Free cooling is not provided by the mixed air control loop.

•All compressors and stages of electric heat have been OFF for at least 30 seconds.

Siemens Building Technologies, Inc.

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Contents 125-699 Rev. BA, July Siemens BACnet Heat Pump Controller MultiPage Credits Service StatementTo the Reader Page Table of Contents Reversing Valve Operation Manual Organization How to Use This ManualManual Conventions Convention ExampleGetting Help Manual SymbolsNotation Symbol Meaning Application Application Description Number Product OverviewOrdering Notes Hardware Outputs Hardware InputsReference Actuators Controller LED IndicatorsTemperature Sensors Related Equipment Siemens Building Technologies, Inc Day/Night Mode Control Temperature SetpointsNight Mode Override Switch ApplicationsCalibration Electric Reheat Heating and Cooling SwitchoverCompressor Operation Fan OperationCentralized Alarm Monitoring Power Failure RecoveryOverriding DOs Fail-safe OperationUsing Auxiliary Points Application Notes Compressor StagingReversing Valve Operation Application 2583 Control Drawing Compressor/Electric Heat Staging AppIication 2584 Control Drawing Using the Controller as a Point Extension Device Application 2590 BACnet Heat Pump Slave ModeApplications Description Address Application Point DatabaseRM Stpt MAX Wall SwitchRM Stpt Dial Stpt DialNGT Ovrd Ovrd TimeRmtmp Offset Rmtmp Offset + Room Temp = CTL TempCLG CMP1 on DAY.NGTCLG CMP1 OFF CLG CMP2 onHTG CMP Elec HeatREV Valve CompressorDmpr POS MTR SetupMTR1 POS FANFree CLG on Cycle FANFree CLG OFF CLG P GainSwitch Limit Rval SwitchSwitch Time HTG LoopoutCAL Timer Switch DbandError Status NGT MA CTLPoint Database Preventive Maintenance TroubleshootingBasic Service Information Controller LEDs Safety FeaturesGlossary English units Control loopEquipment controller Field panelSlave mode Override switchLps LoopoutUnbundle Stand-alone controlFLN IndexBST LED TX LED PIDRTS RX LED

125-699 specifications

The Siemens 125-699 is a state-of-the-art industrial control product that showcases Siemens’ commitment to innovation and quality in automation technology. This device is specifically designed for various industrial applications, providing exceptional performance and reliability.

One of the main features of the Siemens 125-699 is its robust processing capabilities. Equipped with a high-speed processor, it can handle complex control tasks efficiently, ensuring smooth operation even under demanding conditions. This makes it suitable for a wide range of applications, from manufacturing to process automation.

The device supports multiple communication protocols, which enhances its versatility. It is compatible with popular industrial communication standards such as Profinet, Profibus, and Ethernet/IP. This flexibility allows for seamless integration into existing systems and facilitates communication between various devices on the network, making it an ideal solution for modern interconnected factories.

In terms of user interface, the Siemens 125-699 offers an intuitive design with a user-friendly programming environment. The platform supports advanced programming languages, including Ladder Logic and Structured Text, enabling engineers to develop and modify control algorithms with ease. This capability not only improves efficiency but also reduces the time needed for troubleshooting and maintenance.

Another characteristic that sets the Siemens 125-699 apart is its rugged construction. Designed for harsh industrial environments, it features a durable housing that protects against dust, moisture, and extreme temperatures. This robustness ensures longevity and reliability, even in challenging conditions, which is crucial for minimizing downtime and promoting continuous operation.

Additionally, the Siemens 125-699 incorporates advanced diagnostic tools. These tools enable real-time monitoring of the system's performance, allowing operators to detect and address potential issues before they escalate. This proactive approach to maintenance is vital in enhancing productivity and ensuring the smooth operation of industrial processes.

In conclusion, the Siemens 125-699 is a comprehensive solution for industrial automation needs. Its combination of high processing power, versatile communication options, user-friendly interface, rugged design, and advanced diagnostic capabilities makes it a leading choice for companies looking to enhance their automation systems and improve operational efficiency. With Siemens' reputation for quality and innovation, the 125-699 stands as a testament to the company's dedication to advancing industrial technology.
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