USDT 2004 Differential Controller - Thermomax Technologies

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ModeSENSORSGUARDSTARTALARMBTUOperationSelects sensor typeProtects system from overheating and frostStarts pump at pre-set insolation (solar radiation intensity)Enables/Disables protection functionsEnergy calculation and settingSensor Selection – USDT 2004 accepts different sensors types. User canprogram a constant temperature instead of a sensor output also. Thesensor types are programmed at the factory for thermistor (KTY 10) types. ThePT 1000 sensor is recommended for high performance collectors such asThermomax systems and will not be damaged during collector stagnation. PT1000 works fine in 482 o F range and survives up to 572 o F temperatures for ashort period of time. The KTY 10 tank sensor should be used in a conditionedenvironment and will not be permanently damaged up to 360 o F.Selection:S1S2S3Sensor 1 (collector outlet) selectionSensor 2 (collector inlet) selectionSensor 3 (tank) selectionDesignation:PT PT 1000 sensor (1000 O at 0 o C)KTY Thermistor sensor (2000 O at 25 o C)250 250 o F reference temperature- 4 - 4 o F reference temperature13
Sensor wires can receive electromagnetic pulses, which can result in a wrongtemperature reading. The USDT 2004 reads sensor values every 50 ms. It canbundle several readings and process their average.AV 1 Sensor 1 averageAV 2 Sensor 2 averageAV 3 Sensor 3 averageThe numbers of samples can be programmed from 4 to 20.F rost and overheating protections - Pump operation can be manipulatedby the user in both collector stagnation and frost conditions. The set-up ispossible in System Guard, SGUARD, domain.Overheating protection – The Circulation pump may not be powerful enough tocirculate the heat transfer fluid in the solar loop with air pockets. User canprogram the pump to stop at a desired maximum temperature, shown by ?symbol, to protect the pump. The USDT 2004 will take over the normal operationafter the temperature decreases to an acceptable working temperature, shownas =. This feature is disabled at 299 o F set point.Frost Protection – Frost protection in the sun-belt region is provided bycirculating water in the solar loop when freezing conditions exist. Regardless ofthe temperature difference Delta T, the circulation pump runs when the collectortemperature is below a programmable minimum temperature, shown by =symbol. The pump stops as soon as the temperature in the solar loop reaches asafe region programmed by the ? symbol. This feature is also disabled at thefactory by entering - 4 o F.min= Pump runs below this temperaturemin? Pump stops above this temperatureS tart functions - The Circulation pump can be programmed to start on lowinsolation level. The Start function feature is useful when heat transferredto the collector sensor is not fast enough for early start; especially when thecollectors are flat mounted.The enabled start function runs the pump at a given solar radiation orprogrammed temperature difference. The feature is disabled at the factory.14
Page 1 and 2: Revision3THERMO TECHNOLOGIESUSDT 20
Page 3 and 4: IntroductionNote: The information s
Page 5 and 6: INSTALLATIONNote: This installation
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: AUTO - The last display of the abov
Page 17: CLEARClears NO CIRC display after c

USDT 2004 Differential Controller - Thermomax Technologies

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