USDT 2004 Installation and User’s Guide Introduction General Information 2 Installation 3 Collector Sensor 3 Control Box 5 Power Connection 6 Display Window 6 Operation Basic Operation (Factory Setting for Only Two Sensors) 7 Manual Operation Mode 8 Three Sensor Operation 9 Sensor Selection 11 Alarm Functions and Diagnostics 12 Energy Calculations Troubleshooting 13 14 Thermo Technologies 5560 Sterrett Place • Suite 115 Columbia, Maryland 21044 Phone 410.997.0778 • Fax 410.997.
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. U SDT 2004 is a powerful temperature differential control unit. It has *two programs and may be used in a wide range of applications: PROGRAM 0 – This program is USDT 2004's basic program.
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. T he following sa fety precautions are strongly recommended: 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 maintenance. 3.
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. l Return (tank) sensor (white cable): The sensor required for the solar loop return is installed in the lower part of the storage tank.
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 under voltage.
P ower Connections: A small blade screwdriver may be used to fasten miniaturized 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.
Use selection keys ïð during normal system operation to display the desired parameter: T1 xxx T2 xxx T3 xxx XX xxx YY xxx ZZ xxx GAL xx o Collector temperature in F o Tank temperature in F Reading of the third sensor; if the third sensor is not used it displays a fixed o reference temperature of 250 F Collector power in [kW] Energy collected in [MWh] Energy collected in [kWh] Flow rate [gallon/h] Operation Mode – Example: Following chart displays system temperatures At the upper text line , the icon for
RUV X.X – This display shows the software revision number. NR O – This is PROGRAM 0 which indicates simple operation of unit as a Universal Solar Differential Temperature (USDT) controller. Change this value to 1 (NR 1) for activation of the third sensor or pulse flow meter input (PROGRAM 1). Hysteresis Bandwidth User can program hysteresis (temperature range for output control) by using max? and max=.
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 line shows manual operation. Pressing ð one more time lets you turn the pump ON or OFF. By pressing ñ key you change the pump operation.
max=2 Pump runs again below this set point (T3) Energy calculation mode (PROGRAM 1): USDT 2004 computes the energy production as a function of the temperature differential and fluid volume. In addition, the system anti-freeze (Glycol) percentage should be entered as it affects the thermal conductivity and heat transfer rate. Press the Advance key ïð briefly until BTU appears in centerline and press the key ò. Designate sensor inputs for example T1 as collector inlet and T2 as collector outlet temperature.
START ALARM BTU Starts pump at pre-set insolation (solar radiation intensity) Enables/Disables protection functions Energy calculation and setting S ensor Designation – USDT 2004 accepts two different sensor types or a reference value . User can program a constant reference temperature instead of a sensor output. The factory-preset sensor is the thermistor (KTY 10) type. The KTY 10 tank sensor, white wire, should be used in a conditioned environment and will not be permanently damaged up o to 360 F.
circulation pump runs when the collector temperature is below a programmable minimum temperature, shown by = symbol. The pump stops as soon as the temperature in the solar loop reaches a safe region programmed by the ? symbol. This feature is also disabled at the factory o by entering - 4 F. min= min? Pump runs below this temperature Pump stops above this temperature S tart functions - The Circulation pump can be programmed to start on low insolation level.
2 OPEN OK NO CIRC OK CIRC CLEAR Disconnection in sensor 2 wiring System operates normal o r T is more than 108 F in last 30 minutes Pump is running Clears NO CIRC display after correction E nergy calculation - Energy gain is calculated by obtaining the temperature increase of heat transfer fluid across the solar collector. The amount of fluid flow through the collector is registered by an in-line flow meter.
T roubleshooting 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. Check the switch-on and switch-off thresholds and the set differential temperatures.
