1. Introduction
The Ranco ETC-112000 is a single-stage electronic temperature control designed for precise temperature management in various applications. This device features a digital display and a user-friendly keypad for easy setup and adjustment of temperature settings. It is equipped with diagnostic capabilities and a remote temperature sensing feature, making it a versatile solution for maintaining desired temperature conditions.
This manual provides essential information for the safe and effective installation, operation, and maintenance of your Ranco ETC-112000 temperature control.
2. Key Features
- Digital Display and Keypad: Allows for easy programming and constant readout of sensor temperature.
- Adjustable Settings: Setpoint temperature, differential, and mode of operation (heating or cooling) are user-selectable.
- Remote Temperature Sensing: Capable of sensing temperatures up to 400 feet away using standard 22 gauge sensor wire.
- Built-In Diagnostics: Features diagnostic programs to identify hardware, software, or system issues with error code display.
- Keyword Lockout: An internal switch prevents unauthorized tampering with control settings.
- Annunciators: Liquid crystal display indicators show when the relay is energized.
3. Safety Information
Please read and understand all safety instructions before installing or operating the Ranco ETC-112000. Failure to follow these instructions may result in property damage, personal injury, or death.
- Electrical Hazard: Ensure power is disconnected before performing any installation, wiring, or maintenance. Only qualified personnel should perform electrical work.
- Voltage: This device requires a 24 VAC input. Verify your power source matches this requirement.
- Environmental Conditions: Do not expose the control to conditions outside its specified operating and storage ambient temperatures or humidity ranges.
- Enclosure: The NEMA 1 enclosure provides basic protection. Ensure it is installed in an appropriate environment.
4. Setup and Installation
The ETC-112000 is designed for straightforward installation. Follow these steps carefully:
- Mounting: Securely mount the control unit in a suitable location, ensuring it is within the specified ambient temperature and humidity ranges. The enclosure dimensions are 6.52" high x 2.7" wide x 2.48" deep.
- Wiring Power: Connect the 24 VAC input power to the designated terminals on the control unit. Refer to the wiring diagram (typically found inside the control's cover or in a separate wiring guide) for correct connections. Ensure power is OFF before wiring.
- Sensor Installation: Connect the thermistor sensor to the control. The sensor is 2" long x 1/4" diameter with an 8' cable. It can be extended up to 400 feet using standard 22 gauge sensor wire. Position the sensor in the area where temperature measurement is required.
- Load Wiring: Connect the device(s) to be controlled (e.g., heater, cooler) to the SPDT relay output terminals. Ensure the load's power requirements are within the control's relay specifications.
- Power On: Once all connections are secure and verified, restore power to the unit. The digital display should illuminate.
Figure 1: Ranco ETC-112000 Single Stage Temperature Control unit with attached thermistor sensor. The unit features a digital display and control buttons on the front panel.
5. Operating Instructions
The ETC-112000 features a digital display and a keypad for easy operation. When not in programming mode, the display shows the current sensor temperature. Annunciators on the LCD indicate when the relay is active.
5.1. Display Readout
The primary display shows the real-time temperature measured by the sensor. Look for indicators on the display that signal the status of the control relay (e.g., heating or cooling active).
5.2. Keypad Functions
The keypad allows access to programming parameters. Typically, there are buttons for navigating menus, increasing/decreasing values, and confirming selections. Refer to the specific button labels on your unit for exact functions.
6. Programming Settings
To adjust the control's operational parameters, use the keypad to enter programming mode. The ETC-112000 allows adjustment of the setpoint temperature, differential, and mode of operation (heating or cooling).
6.1. Setting Temperature Setpoint
- Enter programming mode (consult your unit's specific button sequence, often a 'SET' or 'PROG' button).
- Navigate to the setpoint temperature parameter.
- Adjust the value using the up/down arrows. The range is 30 to 220 Degrees F.
- Confirm the setting.
6.2. Setting Differential
- In programming mode, navigate to the differential parameter.
- Adjust the value using the up/down arrows. The range is 1 to 30 Degrees F.
- Confirm the setting. The differential prevents rapid cycling of the controlled device.
6.3. Selecting Mode of Operation (Heating or Cooling)
- Access the mode selection parameter in programming mode.
- Choose between 'Heating' or 'Cooling' based on your application.
- Confirm your selection.
6.4. Keyword Lockout Switch
To prevent unauthorized changes to settings, the ETC-112000 includes a keyword lockout switch located inside the enclosure. Activating this switch disables the keypad functions. To enable keypad access, deactivate the switch.
7. Maintenance
The Ranco ETC-112000 is designed for reliable operation with minimal maintenance. Regular inspection and cleaning can help ensure its longevity and accuracy.
- Cleaning: Periodically clean the exterior of the control unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Sensor Inspection: Ensure the temperature sensor is free from debris and properly positioned. Check the sensor cable for any signs of damage.
- Connections: Occasionally verify that all electrical connections are secure and free from corrosion.
8. Troubleshooting
The ETC-112000 is equipped with diagnostic programs to help identify and display issues. If a problem occurs, the unit will display an error code.
8.1. Error Codes
The control displays different error codes to indicate specific problems related to hardware, software, or the system. Consult the following table for common error codes and their resolutions:
| Error Code | Description | Possible Solution |
|---|---|---|
| (Specific error codes not provided in source data) | Indicates a general system fault or sensor issue. | Check sensor connections. Power cycle the unit. If the error persists, contact Ranco support. |
| No Display / Unit Not Powering On | The unit is not receiving power or has an internal fault. | Verify 24 VAC power supply. Check wiring connections. Ensure circuit breaker is not tripped. |
| Incorrect Temperature Reading | Sensor is faulty or improperly installed. | Inspect sensor for damage. Ensure sensor is correctly connected and positioned. |
For specific error code definitions and advanced troubleshooting, refer to the full technical documentation or contact Ranco customer support.
9. Specifications
| Parameter | Value |
|---|---|
| Model | ETC-112000 |
| Temperature Setpoint Range | 30 to 220 Degrees F |
| Differential Range | 1 to 30 Degrees F |
| Input Power Requirements | 24 VAC |
| Sensor Type | Thermistor, 2" long x 1/4" Diameter, with 8' cable |
| Remote Sensing Capability | Up to 400 feet with 22 gauge sensor wire |
| Operating Ambient Temperature | 20 to 140 Degrees F |
| Storage Ambient Temperature | 40 to 176 Degrees F |
| Ambient Humidity | 0 to 95% RH, non-condensing |
| Enclosure Type | NEMA 1 |
| Dimensions (H x W x D) | 6.52" x 2.7" x 2.48" |
| Agency Approvals | UL Listed, CSA Certified |
| Switch Action | SPDT (Single Pole Double Throw) |
| Display Type | LCD |
10. Warranty and Support
Information regarding the specific warranty terms for the Ranco ETC-112000 was not provided in the product data. For warranty details, technical support, or service inquiries, please contact Ranco directly or refer to the documentation included with your purchase.
It is recommended to keep your purchase receipt as proof of purchase for warranty claims.
