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USDT 2004B
Installation and User’s Guide
Introduction
General Information 2
Installation
Collector Sensor 3
Control Box 5
Power Connection 6
Display Window 6
Operation
Basic Operation of Digital Display 6
Programming the Temperature Range 8
Manual Operation Mode 9
Troubleshooting 10
Thermo Technologies
5560 Sterrett Place • Suite 115
Columbia, Maryland 21044
Phone 410.997.0778 • Fax 410.997.0779
e-Mail info@the
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Introduction Note: The information supplied in this manual is for guidance only - no part of this may be used for any agreement, whether express or implied, or to form any contract. Thermo Technologies reserves the right to change specifications without prior notice. SDT 2004B is a powerful temperature differential control unit. It uses two temperature U sensors to control a simple solar water heating system; one sensor measures the temperature of the solar collector whilst th
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INSTALLATION Note: This installation procedure is for guidance only, and the installer should verify its suitability. Make sure that the solar system is physically installed, manually tested, and ready for controlled operation. he following safety precautions is strongly recommended: T 1. Before attempting to install and operate the unit read this instruction manual carefully. 2. Only suitably qualified personnel should carry out installation and required maintenanc
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l Collector sensor (red cable with protective terminal box): Either push into a thermowell, (sensor pocket), which is soldered or riveted directly to the manifold (vacuum tubes). Alternately, strap the sensor to the collector outlet pipe or the absorber (flat plate collectors) that projects from the collector housing. Ideally, house the collector sensor (encased in a suitable sensor pocket) into a T-piece on the collector return outlet. Protect the sensor cable from UV and moisture.
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Undo the screw at the top of the housing. The control electronics are mounted on the enclosure cover. The controller enclosure can be screwed to the wall with cable entry grommets pointed downwards. Use the supplied plastic bridges to secure power and sensor cables. Base of the unit to be mounted at eye-level and wired as shown above Caution: Controller wiring should only be done when the unit is not energized. It is possible to damage the control unit if it is assembled un
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ower Connections: A small blade screwdriver may be used to fasten miniaturized P terminal block screws while the corresponding wire is inserted. NOTE 1: Always disconnect the controller from power supply before opening the housing. NOTE 2: The controller should be properly grounded. Flexible wires, 18/3 AWG (gauge/conductor) simplify connection to the terminals. The power terminal block will accommodate wire sizes to 14 AWG. All other connections should be secured and adequa
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ò Push selection key once to enter the advanced (Par or *Men) mode. Once in selected mode, press one more time to select the parameter in that mode. Selected parameter blinks allowing the user to modify it. You can modify the selected parameter while the middle window blinks by pressing the ï or ð key. ñ Push selection key once to accept selection (blinking stops showing the new set-point steady) or go back to the previous selection. (*) USDT 2004B does not support “Men” mode oper
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Par Using the navigation key ^_ allows you to select the desired parameter while you are in the program mode. Press the selection key ò once to select the parameter in the window. Selected parameter blinks allowing you to modify it. You can modify the selected parameter while the middle window blinks by pressing the ï or ð key. The unit accepts the new value by pressing the ñ key once. RUV 2.0 – This display shows the software revision number. NR O – This indicates the USDT 20
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Manual Operation Mode This mode allows the user to manually turn the pump on or off. AUTO The above display indicates that the unit is working in automatic mode. The o pump starts at a temperature difference of 15 F and runs as long as ? T is o above 7 F. The B symbol appears in upper display line next to the collector symbol while the pump is running. User can switch to manual mode by pressing ò key. By pressing ð key while centerline blinks, a hand symbol G in lower lin
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roubleshooting T In general, all of the settings in the menus Par and Men and the terminal should first be checked if there is a malfunction. Malfunction, but "realistic" temperature values: • Check program number. It should be “0” (zero) for 2004B unit. • Check the switch-on and switch-off thresholds and the set differential temperatures, page 8. Have the thermostat and differential thresholds already been reached? • Can the pump (output) be switched on and off in manual mode? I
