Introducing the THMU3, a budget-friendly automatic monitoring and control Trace Heating unit designed for use in Sprinkler Systems in accordance with BS EN 12845/LPC/FPA(RC38) regulations. This unit comes in a weather-resistant plastic enclosure rated IP55, with a latching hinged viewing window for easy access to all the controls. It also includes a Temperature sensor assembly.

The THMU3 is equipped with an automatic heating feature that activates when the Sensor Temperature drops below the Heating Set Point, which is preset at 5oC. The unit also has a failsafe operation that switches to the Secondary circuit output if there is a fault in the Primary circuit. Additionally, the THMU3 is designed to monitor the power integrity of both the Primary and Secondary heating outputs at 2-hour intervals. The Heating tape outputs are protected by a 16 Amp Type "B" MCB.

The unit features two heating Set Points: 5oC or 8oC, which can be selected through an internal DIL switch. An LED Bar display indicates the Sensor temperature, and a remote (N/O) input is provided for the installation of an external Thermostat/Switch to override the sensor circuit setting.

The Temperature sensor circuit is monitored for open and short circuit conditions, and any faults will trigger automatic heating, ensuring failsafe operation. The THMU3 can monitor Trace heating in the range of 30 W to 3.0 KW for Constant wattage Heating tape or 30 W to 2.0 KW for Self-regulating Heating tape. Upon initial setup, the unit will auto-calibrate the heating load of both the Primary and Secondary circuits.

LED indicators provide visual indication for "Heating On" and "Fault" for both primary and secondary circuits. A "TEST" switch is also included for manual testing of both primary and secondary outputs. In the event of a fault, the appropriate Fault LED will illuminate along with the internal buzzer, and the Fault contacts (CHO & N/O) will also operate, ensuring failsafe operation. The System ON LED will flash under normal operating conditions. Additionally, the THMU3 can be used as a "Single Heating" monitored unit selected by a DIL switch (with secondary output monitoring/switching being isolated).

All controls and operating instructions are provided on the inner facia, and the unit is designed for easy installation. The front lid can be easily removed with four front screws, and the complete internal assembly can be removed with just two screws, allowing for complete back box access.

Key Features:

• Dedicated low-cost automatic monitoring and control Trace Heating unit
• Designed for use in Sprinkler Systems in accordance with BS EN 12845/LPC/FPA(RC38) regulations
• Weather-resistant plastic enclosure rated IP55
• Latching hinged viewing window for easy access to controls
• Temperature sensor assembly included
• Automatic heating feature activates when Sensor Temperature drops below Heating Set Point
• Failsafe operation switches to Secondary circuit output in case of Primary circuit fault
• Monitors power integrity of both Primary and Secondary heating outputs at 2-hour intervals
• Heating tape outputs protected by 16 Amp Type "B" MCB
• Two heating Set Points: 5oC or 8oC
• LED Bar display indicates Sensor temperature
• Remote (N/O) input provided for external Thermostat/Switch installation
• Temperature sensor circuit monitored for open and short circuit conditions
• Auto-calibrates heating load of both Primary and Secondary circuits upon initial setup
• LED indicators for "Heating On" and "Fault" for both primary and secondary circuits
• "TEST" switch for manual testing of both primary and secondary outputs
• Fault contacts (CHO & N/O) ensure failsafe operation in case of fault
• System ON LED flashes under normal operating conditions
• Can be used as a "Single Heating" monitored unit selected by DIL switch (with secondary output monitoring/switching isolated)
• All controls and operating instructions provided on inner facia
• Designed for easy installation

Specifications:

• Monitors Trace heating in the range of 30 W to 3.0 KW for Constant wattage Heating tape or 30 W to 2.0 KW for Self-regulating Heating tape
• IP rating: IP55
• MCB rating: 16 Amp Type "B"