USDT 2004 Differential Controller - Thermomax Technologies

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STARTENABLDISABStart function screenEnable start functionDisable start functionIf this feature is selected, following parameters must be adjusted for properoperation:SENS Pyranometer port designation (radiation monitoring sensor port)1 Sensor 12 Sensor 23 Sensor 3-- Manual input in next stepINS Radiation threshold in W/m 2CIRC Pump runtime in secondsINT Maximum interval time in secondFLU Number of flushesThe following example activates the circulation pump at 200 W/m 2 and runs it for15 seconds. If rT condition is met within the time period, the pump stays on.INS 20CIRC 15Alarm functions - User can enable the alarm function of the USDT 2004in the ALARM screen. Status of sensors and circulation pump can beviewed if alarm function is active.A ONA OFFAlarm function enableAlarm function disableThe status of the system can be monitored in the Stat Mode only if thecorresponding feature is active. The following example shows a system conditionwith a circulation problem:OT OFF Overheating feature disableOT OK No overheating1 SHORT Short circuit in sensor 1 wiring2 SHORT Short circuit in sensor 2 wiring1 OPEN Disconnection in sensor 1 wiring2 OPEN Disconnection in sensor 2 wiringOK System operates normalNO CIRC r T is more than 108 o F in last 30 minutesOK CIRC Pump is running15
CLEARClears NO CIRC display after correctionE nergy calculation - Energy gain is calculated by obtaining thetemperature increase of heat transfer fluid across the solar collector. The amountof fluid flow through the collector is registered by an in-line flow meter. USDT2004 computes the energy production as a function of the temperaturedifferential and fluid volume. In addition, the system anti-freeze (Glycol)percentage should be entered as it affects the thermal conductivity and heattransfer rate.BTU Energy calculation modeS IN Sensor port selection for inlet temperature (1, 2, 3, --)S OUT outlet temperature (1, 2, 3, --)F SEN Sensor port selection for flow rate (1, 2, 3, --)Energy calculation will be initiated only after temperature sensor ports aredesignated. Flow rate can be either a constant number to be entered by user, orfrom a flow meter input. To activate the energy calculation without using the flowmeter's impulse input, a dash (-) must be selected for F SEN channel followed bythe constant flow rate in gph (gallon per hour) unit.LLP Flow meter rate impulse number in liter per pulse, if flow meter isusedGAL Constant flow rate in gph instead of flow meter reading in (--)sensor modeGLYCOL Anti-freeze percentageCLEAR Sets the BTU meter's counter to zeroDIF Sensor calibrationThe output of USDT 2004 unit is kW for system power and kWh or MWh forcollected energy.The energy calculation dependents on flow meter accuracy, the temperaturesensors class, and their locations. The flow meter is a mechanical device and itsaccuracy fluctuates over time. Therefore, the user should calibrate the flow meterand incorporate temperature sensor tolerance.The supplied Thermistor sensor has an accuracy of ± 2 o F. The PT1000 sensoroffers a better accuracy of ± 1 o F. DIF represents the temperature differencebetween two sensors. User can increase the accuracy of reading by adjusting theDIF parameter. The energy calculation becomes accurate at temperature rangethat this reading adjustment is made.16
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 and 14: AUTO - The last display of the abov
Page 15: Sensor wires can receive electromag

USDT 2004 Differential Controller - Thermomax Technologies

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