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THERMO TECHNOLOGIES

USDT 2004 Differential Controller

Installation and

User’s Guide

Revision

3

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Summary of Contents for USDT 2004

Page 1: ...THERMO TECHNOLOGIES USDT 2004 Differential Controller Installation and User s Guide Revision 3 ...

Page 2: ...mation 3 Installation 4 Collector Sensor 5 Control Box 6 Power Connection 8 Sensor Connection 7 Operation Control Mode 10 Program Mode 10 Advanced Mode 12 Alarm Functions and Diagnostics 15 Energy Calculations 16 Thermo Technologies 5560 Sterrett Place Suite 115 Phone 410 997 0778 Fax 410 997 0779 e Mail info thermotechs com June 2004 ...

Page 3: ...e reaches the programmable high limit TMAX temperature To prevent freezing the controller activates the pump and circulates water through the solar loop when frost conditions exist The temperature hysteresis a lagging in the set point may over ride DELTA T and can be modified in advanced operation mode to avoid pump cycling You may measure the temperature of the storage tank T3 top of the tank usi...

Page 4: ... or couplings 17 Immersion Heater 6 Collector Return 12 Pressure Relief Valve 18 USDT 2001 Controller Operation USDT 2004 Controller 18 will switch on the pump 11 when the temperature at the collector sensor T1 TC is higher than the return temperature T2 TR by at least the pre selected amount T The pump circulates a heat transfer fluid around the loop Heat from the collector is transferred to the ...

Page 5: ... supply via a suitably 6 amps isolating switch 4 WARNING When the unit is connected to the 115 volt power supply and the cover is opened high voltage circuits will be exposed Therefore when installing the unit 115 volt model ensure all required connections are made and the cover is attached to the controller box before turning the power on Ensure that all the connections are secure If any maintena...

Page 6: ...ion of a suitable sensor pocket into a T piece on the collector return outlet to house the collector sensor Protect sensor cable from UV and moisture For vacuum tube collectors use only PT1000 sensors 480 F max temperature l Hot water tank sensor white cable In the case of external heat exchangers the tank sensor should be installed with an immersion sleeve in the return leg cold side of the heat ...

Page 7: ... until tubing shrinks tight This connection can then be drawn gently into the pipe work You need only two wires for sensor cable the other two wires are spare wires Caution Do not overheat tubing Remove heat as soon as tubing shrinks tight as material will continue to shrink With flame source use even back and forth motion all around tubing A heat gun may be used if available Let tubing cool for m...

Page 8: ...an be screwed to the wall with cable entry grommets downwards Use the supplies plastic bridges to secure power and sensor cables Base of the unit to be mounted at the 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 ...

Page 9: ...using 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 wi re sizes to 14 AWG All other connections should be secured and adequately tightened as loose power connections will over heat and may cause fire NOTE 3 It is important that the specified output loads 245 Watts are not exce...

Page 10: ...ter by one unit ò Push selection key once to enter the advanced mode Once in advanced mode press one more time to select the parameter 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 ...

Page 11: ...am mode Program Mode 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 selected 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 onc...

Page 12: ...x min and min max 1 Pump stops above this temperature T1 T2 T3 max 1 Pump runs below this temperature if other conditions are met T1 T2 T3 Note This feature is useful to protect over heating of storage tank T2 and in other program version not supported with basic software load diff 1 Pump runs when temperature difference between collector T1 collector and T2 tank exceeds this value Factory setting...

Page 13: ...ters can be changed to meet the unique requirements of other applications The user may request an access code to modify the USDT 2004 program mode and its parameters To get your unique access code please register your unit at Solar ThermoTechs com We need the serial number of your USDT 2004 and your e mail address to e mail your access code The factory setting will be retrieved by pressing and hol...

Page 14: ...10 types The PT 1000 sensor is recommended for high performance collectors such as Thermomax systems and will not be damaged during collector stagnation PT 1000 works fine in 482 o F range and survives up to 572 o F temperatures for a short period of time The KTY 10 tank sensor should be used in a conditioned environment and will not be permanently damaged up to 360 o F Selection S1 Sensor 1 colle...

Page 15: ...n acceptable working temperature shown as This feature is disabled at 299 o F set point Frost Protection Frost protection in the sun belt region is provided by circulating water in the solar loop when freezing conditions exist Regardless of the temperature difference Delta T the circulation pump runs when the collector temperature is below a programmable minimum temperature shown by symbol The pum...

Page 16: ...d the pump stays on INS 20 CIRC 15 larm functions User can enable the alarm function of the USDT 2004 in the ALARM screen Status of sensors and circulation pump can be viewed if alarm function is active A ON Alarm function enable A OFF Alarm function disable The status of the system can be monitored in the Stat Mode only if the corresponding feature is active The following example shows a system c...

Page 17: ...g the flow meter s impulse input a dash must be selected for F SEN channel followed by the constant flow rate in gph gallon per hour unit LLP Flow meter rate impulse number in liter per pulse if flow meter is used GAL Constant flow rate in gph instead of flow meter reading in sensor mode GLYCOL Anti freeze percentage CLEAR Sets the BTU meter s counter to zero DIF Sensor calibration The output of U...

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