USDT 2004 Differential Controller - Thermomax Technologies

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General Information:USDT 2004, program mode “0”, is suitable for Closed and Open Loop systems.Closed Loop Solar Heating Systems are the preferred option for extremely coldareas and areas with questionable water quality. The following arrangementshows an application example in a closed loop system.1. Collector 7. Check Valve 13. Pressure Gauge2. Collector Sensor 8. Hose Bibs for Filling and Flushing 14. Collector Supply3. Manual Air Valve 9. Expansion Tank 15. Heat Exchange Coil4. Hot Water to Taps 10. Air Purge and Air Vent 16. Solar Hot Water Tank5. Tempering Valve 11. Circulating Pump with flanges or couplings 17. Immersion Heater6. Collector Return 12. Pressure Relief Valve 18. USDT 2001 ControllerOperation:USDT 2004 Controller (18) will switch on the pump (11) when the temperatureat the collector sensor (T 1 ) T C is higher than the return temperature (T 2 ) T R by atleast the pre-selected amount ?T. The pump circulates a heat transfer fluidaround the loop. Heat from the collector is transferred to the storage tank throughthe heat exchange coil. With the pump running, if DELTA T is less than presetvalue, the pump will switch off. When a preset collector temperature is reached atT MAX , the controller switches off the pump. The check valve (non-return valve)prevents heat from the tank rising towards the collector, should the tank bewarmer (e.g. at night). Please refer to the operation section of manual.3
INSTALLATIONNote: This installation procedure is for guidance only, and the installer shouldverify its suitability. Make sure that the solar system is physically installed,manually tested, and is ready for controlled operation.T he following safety precautions are strongly recommended:1. Before attempting to install and operate the unit read this instruction manualcarefully.2. Only suitably qualified personnel should carry out installation and anymaintenance required.3. It is recommended that the unit be connected to the power supply via asuitably 6 amps isolating switch.4. WARNING: When the unit is connected to the 115-volt power supply andthe cover is opened, high voltage circuits will be exposed. Therefore,when installing the unit (115-volt model) ensure all required connections aremade and the cover is attached to the controller box before turning the poweron. Ensure that all the connections are secure. If any maintenance work isrequired ensure that the unit is isolated from the power supply beforeremoving the cover. Never leave the unit unattended if the cover hasbeen removed and the power supply is connected.5. Do not exceed unit ratings of 2.15 amps (1/6 HP or 245 Watts pump).6. It is advisable to route power cables away from sensor cables.4
Page 1 and 2: Revision3THERMO TECHNOLOGIESUSDT 20
Page 3: IntroductionNote: The information s
Page 7 and 8: attach the sensor at the same place
Page 9 and 10: Miniaturized terminal blocks are us
Page 11 and 12: Operation Mode - Displays temperatu
Page 13 and 14: AUTO - The last display of the abov
Page 15 and 16: Sensor wires can receive electromag
Page 17: CLEARClears NO CIRC display after c

USDT 2004 Differential Controller - Thermomax Technologies

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