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Thermo Technologies USDT2004 Installation And User Manual

Temperature differential control unit
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Installation and User's Guide
General Information
Control Box
Power Connection
Display Window
Operation
Three Sensor Operation
Alarm Functions and Diagnostics
Energy Calculations
Troubleshooting
USDT 2004
Thermo Technologies
5560 Sterrett Place • Suite 115
Columbia, Maryland 21044
Phone 410.997.0778 • Fax 410.997.0779
e-Mail info@thermotechs.com
Revision 7, November 2005
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  Summary of Contents for Thermo Technologies USDT2004

  • Page 1: Table Of Contents

    Installation and User’s Guide Introduction General Information Installation Collector Sensor Control Box Power Connection Display Window Operation Basic Operation (Factory Setting for Only Two Sensors) Manual Operation Mode Three Sensor Operation Sensor Selection Alarm Functions and Diagnostics Energy Calculations Troubleshooting 5560 Sterrett Place •...
  • Page 2: 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 2004 is a powerful temperature differential control unit.
  • Page 3: 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 sa fety precautions are strongly recommended: 1. Before attempting to install and operate the unit read this instruction manual carefully. 2.
  • Page 4 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.
  • Page 5 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.
  • Page 6 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.
  • Page 7: Basic Operation (Factory Setting For Only Two Sensors)

    Use selection keys ïð during normal system operation to display the desired parameter: T1 xxx Collector temperature in T2 xxx Tank temperature in T3 xxx Reading of the third sensor; if the third sensor is not used it displays a fixed reference temperature of 250 XX xxx Collector power in [kW]...
  • Page 8: Manual Operation Mode

    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).
  • Page 9: Sensor Selection

    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.
  • Page 10 max=2 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...
  • Page 11 START Starts pump at pre-set insolation (solar radiation intensity) ALARM Enables/Disables protection functions Energy calculation and setting 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.
  • Page 12 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 by entering - 4 min= Pump runs below this temperature...
  • Page 13 2 OPEN Disconnection in sensor 2 wiring System operates normal r T is more than 108 NO CIRC OK CIRC Pump is running CLEAR Clears NO CIRC display after correction nergy calculation - Energy gain is calculated by obtaining the temperature increase of heat transfer fluid across the solar collector.
  • Page 14 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. Have the thermostat and differential thresholds already been reached? Were the settings in the submenus (Men) changed? Can the pump (output) be switched on and off in manual mode? If a forced pump “ON”...