1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the TPI Corporation T5100 Built-in Thermostat. The T5100 thermostat is designed for use with TPI 5100 series fan-forced electric heater models, offering precise temperature control for units ranging from 3.3 to 20kW. Please read this manual thoroughly before installation and use to ensure safe and efficient operation.
2. Safety Information
WARNING: To reduce the risk of fire, electric shock, or injury, observe the following safety precautions:
- Always disconnect power to the heater unit at the main service panel before installing or servicing the thermostat.
- Installation must be performed by a qualified electrician in accordance with all local and national electrical codes.
- Ensure the thermostat's voltage and wiring are compatible with the electrical circuit where it is to be used.
- Do not operate the thermostat or heater with damaged wiring or components.
- Keep the area around the heater and thermostat clear of combustible materials.
3. Product Overview
The TPI T5100 is a built-in thermostat designed to integrate directly into compatible TPI 5100 series electric heater units. It features a single-pole, single-throw (SPST) switch for either low-voltage or line duty operation, providing reliable temperature regulation.

Figure 1: TPI T5100 Built-in Thermostat. This image shows the thermostat module with its wiring connections and the copper sensor bulb.

Figure 2: TPI T5100 Thermostat, another view. This image provides an alternative perspective of the thermostat, highlighting its compact design and mounting bracket.
4. Setup and Installation
The T5100 thermostat is designed for field installation into the enclosure of TPI 5100 series fan-forced electric heaters. Refer to the specific heater unit's instruction manual for detailed access and wiring diagrams.
Installation Steps:
- Power Disconnection: Ensure all power to the heater unit is disconnected at the circuit breaker or fuse box before beginning installation. Verify with a voltage tester.
- Access Heater Enclosure: Open the heater unit's control panel or access cover as per the heater's manual.
- Mount Thermostat: Securely mount the T5100 thermostat within the designated area inside the heater enclosure. The thermostat typically mounts using screws or clips provided with the heater or thermostat.
- Wiring Connections: Connect the thermostat's wires to the appropriate terminals within the heater unit. The T5100 operates as a single-pole, single-throw (SPST) switch. Ensure connections are tight and secure. Refer to the wiring diagram provided with your 5100 series heater for correct terminal identification.
- Sensor Bulb Placement: Position the copper sensor bulb in the designated location within the heater, typically in the airflow path, to accurately sense the ambient temperature. Avoid bending the capillary tube sharply.
- Close Enclosure: Once wiring and sensor placement are complete, securely close the heater unit's control panel or access cover.
- Restore Power: Restore power to the heater unit at the main service panel.
5. Operating Instructions
After installation, the T5100 thermostat will control the heater's operation based on the set temperature. The thermostat typically features a rotary dial or similar mechanism for setting the desired temperature.
Setting the Temperature:
- Locate the temperature adjustment dial or control on the heater unit's control panel.
- Rotate the dial to the desired temperature setting. The heater will activate when the ambient temperature falls below the set point and deactivate when it rises above the set point.
- Allow time for the heater to cycle and stabilize the room temperature. Adjust the setting as needed for comfort.
6. Maintenance
The TPI T5100 Built-in Thermostat requires minimal maintenance. Regular inspection of the heater unit and its components is recommended.
- Annual Inspection: Annually, or as part of routine heater maintenance, inspect the thermostat's wiring connections for tightness and signs of wear or damage.
- Cleaning: If accessible, gently clean any dust or debris from the thermostat and its sensor bulb using a soft, dry cloth. Ensure power is disconnected before cleaning.
- Sensor Integrity: Ensure the sensor bulb and capillary tube are not damaged or kinked, as this can affect temperature accuracy.
7. Troubleshooting
If the heater unit is not operating as expected with the T5100 thermostat, consider the following common issues:
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater not turning on | No power to heater; Thermostat set too low; Faulty wiring connection; Thermostat malfunction. | Check circuit breaker; Increase thermostat setting; Inspect wiring (with power off); Consult a qualified technician. |
| Heater not turning off | Thermostat set too high; Thermostat malfunction; Sensor bulb improperly placed or damaged. | Decrease thermostat setting; Consult a qualified technician; Verify sensor bulb placement and condition. |
| Inaccurate temperature control | Sensor bulb obstructed or improperly placed; Drafts affecting sensor; Thermostat calibration issue. | Ensure sensor is clear and in proper airflow; Eliminate drafts near sensor; Consult a qualified technician. |
8. Specifications
- Model: T5100
- Compatibility: TPI 5100 Series Fan-Forced Electric Heater Units (3.3 to 20kW)
- Switch Type: SPST (Single Pole, Single Throw)
- Operation: Line Duty or Low Voltage
- Color: White
- Product Dimensions: 4 x 4 x 6 inches
- Item Weight: 6.4 ounces
- Manufacturer: TPI
9. Warranty and Support
For warranty information or technical support regarding your TPI Corporation T5100 Built-in Thermostat, please refer to the documentation included with your specific TPI 5100 series heater unit or contact TPI Corporation directly. Contact details can typically be found on the manufacturer's official website or on the product packaging.
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