1. Introduction
The Dwyer Series TSXT Digital Temperature Switch is engineered for precise refrigeration system control. This device is compatible with both PTC and NTC temperature probe types, enabling comprehensive management of various refrigeration components including the compressor, defrost cycles, fan, alarm functions, and internal lighting. Its design supports master/slave configurations, facilitating synchronized defrost operations across multiple units. User programming is accessible via the intuitive front keypad or through the optional TS2-K programming key.
2. Product Overview
Figure 1: Front view of the Dwyer TSXT-213 Digital Temperature Switch. The image displays the digital temperature readout, along with 'AUX', 'SET', 'Up', and 'Down' control buttons. The unit is black with a blue digital display.
The TSXT-213 features a clear digital display for temperature readings and several buttons for configuration and operation.
- Digital Display: Shows current temperature and programming parameters.
- AUX Button: Auxiliary function control.
- SET Button: Accesses and confirms programming settings.
- Up/Down Buttons: Navigates menus and adjusts values.
3. Specifications
| Parameter | Value |
|---|---|
| Probe Range (PTC) | -58 to 302°F (-50 to 150°C) |
| Probe Range (NTC) | -58 to 230°F (-50 to 110°C) |
| Input | PTC (1000 Ω @ 25°C) or NTC (10 KΩ @ 25°C) thermistor |
| Output (Relay 1) | SPST, 16 A @ 240 VAC resistive, 10 FLA, 60 LRA |
| Output (Relay 2) | SPST, 5 A @ 240 VAC resistive |
| Output (Relay 3) | SPST, 8 A @ 240 VAC resistive |
| Ambient Operating Temperature | 32 to 131°F (0 to 55°C) |
| Storage Temperature | -4 to 176°F (-20 to 80°C) |
| Accuracy | ±1% FS |
| Display | 3-digit, plus sign |
| Resolution | 0.1° |
| Memory Backup | Nonvolatile memory |
| Item Weight | 7.2 ounces |
| Manufacturer | Dwyer Instruments, Inc. |
4. Setup and Installation
Proper installation is critical for the safe and accurate operation of the TSXT-213. Refer to the wiring diagram typically found on the unit's casing or in the full manufacturer's documentation for specific connection details.
4.1 Mounting
The TSXT-213 is designed for panel mounting. Ensure adequate space for ventilation and access to wiring terminals. Secure the unit firmly in its designated panel cutout.
4.2 Electrical Connections
- Power Supply: Connect the unit to a 115 VAC power source as indicated on the wiring diagram. Ensure power is disconnected before making any connections.
- Probe Connection: Connect the appropriate PTC or NTC temperature probe to the designated input terminals. Ensure correct polarity if specified by the probe type.
- Relay Outputs: Connect the compressor, defrost heater, fan, alarm, and light circuits to the respective relay output terminals (Relay 1, Relay 2, Relay 3) according to your system's requirements and the wiring diagram. Observe all local electrical codes and safety standards.
- Modbus Connection (Optional): If utilizing Modbus communication, connect the Modbus lines to the appropriate terminals.
Caution: All electrical work should be performed by qualified personnel. Disconnect all power before wiring to prevent electric shock or damage to the unit.
5. Operating Instructions
Once installed and powered, the TSXT-213 will display the current temperature. The front panel buttons allow for parameter viewing and adjustment.
5.1 Basic Operation
- Viewing Temperature: The default display shows the current temperature measured by the probe.
- Adjusting Setpoints:
- Press the SET button to enter the setpoint adjustment mode.
- Use the Up and Down buttons to change the desired temperature setpoint.
- Press SET again to confirm and save the new setpoint.
- Accessing Parameters: Press and hold the SET button for several seconds to access the programming menu. Use Up and Down to navigate through parameters and SET to select and confirm.
- AUX Function: The AUX button typically controls an auxiliary function, such as manual defrost or light control, depending on configuration. Refer to the detailed programming manual for specific AUX button functionality.
5.2 Advanced Programming
The TSXT-213 offers extensive programming options for compressor differential, defrost cycles, fan control, alarm thresholds, and master/slave configurations. These advanced settings are accessed through the programming menu. For detailed instructions on each parameter, consult the comprehensive programming guide provided by Dwyer Instruments, Inc.
Alternatively, the optional TS2-K programming key can be used for quick and efficient configuration of multiple units.
6. Maintenance
The Dwyer TSXT-213 is designed for reliable operation with minimal maintenance. Regular checks can help ensure continued performance.
- Cleaning: Periodically clean the front panel with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Probe Inspection: Inspect the temperature probe and its wiring for any signs of damage or corrosion. Ensure the probe is securely positioned in its measurement location.
- Terminal Connections: Occasionally check electrical terminal connections for tightness, especially after initial installation or if the unit has been subjected to vibration.
- Software Updates: Check the manufacturer's website for any available firmware updates or new programming guides.
Warning: Disconnect power to the unit before performing any maintenance or cleaning to prevent electric shock.
7. Troubleshooting
This section provides solutions to common issues encountered with the TSXT-213. For problems not listed here, contact technical support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank | No power; incorrect wiring; internal fault. | Check power supply and wiring connections. Ensure 115 VAC is present. If power is confirmed, contact support. |
| Incorrect temperature reading | Faulty probe; incorrect probe type selected in settings; poor probe connection. | Verify probe type (PTC/NTC) matches setting. Check probe wiring for damage or loose connections. Test probe if possible. Replace probe if faulty. |
| Relay outputs not activating | Setpoint not met; programming error; faulty relay. | Check setpoint and differential settings. Review programming parameters. Verify load connections. If all settings are correct and load is functional, relay may be faulty. |
| Unit not responding to button presses | Unit locked; internal fault. | Check if the keypad is locked (refer to programming manual). Power cycle the unit. If issue persists, contact support. |
8. Warranty and Support
For specific warranty information regarding the Dwyer TSXT-213 Digital Temperature Switch, please refer to the documentation included with your purchase or visit the official Dwyer Instruments, Inc. website. Warranty terms and conditions may vary.
For technical assistance, troubleshooting beyond this manual, or to inquire about replacement parts, please contact Dwyer Instruments, Inc. customer support directly. Contact details can typically be found on the manufacturer's website or product packaging.
Manufacturer: Dwyer Instruments, Inc.
Website: www.dwyer-inst.com
