Fourtech Temperature — Controller Manual

Terminals 3, 4, and 5 generally host the input signals (Thermocouples or RTDs).

Press to confirm settings or hold to enter the menu system.

DIY projects where precise temperature isn’t critical (< ±1–2°C). Not for: Medical devices, direct compressor control without a contactor, or UL-listed commercial apps.

To ensure accuracy and safety, follow these standard setup rules found in technical guides: Sensor Polarity: fourtech temperature controller manual

The INFO function remains active for 3 minutes. You can exit it early by pressing and holding the "i" button again for 5 seconds.

| Error Code | Meaning | Likely Fix | | :--- | :--- | :--- | | or - - - - | Sensor broken, shorted, or not connected | Check thermocouple wiring; replace sensor. | | HHH or LLLL | Process value above or below sensor range | Sensor type mismatch. Check input type setting (e.g., set to K type instead of Pt100). | | E.OP1 | Output 1 overload or short circuit | Inspect SSR or relay; power cycle controller. | | LOC.1 | Parameter lock is engaged | Enter the access code (often 0001 or 0100) per your manual. | | AT.ERR | Auto-tune failed | Manual tune needed; check for external disturbances (open doors, wind). |

key once briefly. The SV display (usually the bottom green digits) will flash. arrows to reach your desired temperature. again to save and exit. Changing Sensor Type Terminals 3, 4, and 5 generally host the

For optimal performance, the Fourtech controller should learn the thermal characteristics of your specific setup. Set your desired temperature (SV). Enter the parameter menu (hold ). Locate the Atu parameter and change it to 1 (ON) . Exit the menu. The display will flash "AT" or "Atu".

Where you connect your SSR (Solid State Relay) or Magnetic Contactor. 3. Setting the Temperature (SV) Setting your target is the most common task: Press the SET key briefly. The SV display will flash.

For , connect the positive and negative terminals directly to the control input of your Solid State Relay. 3. Basic Operation and Adjusting the Set Value (SV) Not for: Medical devices, direct compressor control without

When the controller detects an operational error, it will halt normal processes and flash an error code on the PV display. oPPN (Open Sensor Error)

Set to ON to allow the controller to learn system parameters. 4. How to Use Auto-Tuning (ATU)

A Fourtech temperature controller is a digital device used to maintain a specific temperature setpoint. It works by taking input from a sensor (like a thermocouple or RTD) and adjusting an output device (like a relay, SSR, or heater). Key features often include:

A: Look for a parameter called F-RST or INIT in the advanced menu (usually under FUNC or SEC ). Set it to 1 . Warning: This erases all PID and alarm settings.

For the technician in the field, accessibility is key. The manual usually features a comprehensive table of contents and an index, allowing for rapid navigation. Furthermore, the inclusion of detailed diagrams—ranging from dimensional drawings for panel cutouts to intricate wiring schematics—ensures that the manual serves as both a planning tool for system designers and a reference guide for maintenance personnel.