Programmable Differential Thermostat TD
Contents
1. C The default setting disables this function 3 9 Tvmax maximum allowed water tank temperature at which an emergency drainage of the water tank can be started by means of relay output 3 It can be adjusted in the range between 50 and 95 C The default setting is 95 C 2 When one of the temperatures is grater than 120 C on the digital display is being indicated Hi When one of the temperatures is lower than 20 C on the digital display is being indicated Lo Differential Thermostat DT 3 3 operation depends on the temperature sensor states as follows Installations equipped with one water tank A Normal operation The circulation pump is being switched on and the water tank heating is being started if the temperature at the lowest part of the water tank is lower than Tzad and there is a positive difference At between the solar panel and lowest part or the water tank temperature grater than the assigned one dT T1 T2 gt dT The circulation pump is being stopped relay output 1 if during water tank heating At is being decreased thus after At gets equalized with the assigned one dT The heating of the water tank at the above mentioned conditions is going until the water tank temperature at its lowest part is getting the same with the assigned one Tzad Afterwards the pump is being switched off and the heating is being stopped If under the above mentioned conditions the solar panel temperature is going down2. bellow Temin then the circulation pump operation will be stopped by force despite of conditions At gt dTu T2 lt Tzad could be available In case the solar panel temperature falls bellow Tdef the circulation pump is being switched on by force never mind it has been switched off due to solar panel temperature decreasing bellow Temin only in case the defrost option is activated If during the previous mentioned operation mode the water tank temperature falls down bellow Tbmin then the circulation pump is being switched off as the solar panel defrosting is being stopped If the water tank temperature at its upper part T3 is lower than the assigned one Tzad1 then the electrical heating elements operation is being allowed until Tzad1 is being reached relay output 2 but only in case there are no conditions for circulation pump operation B Emergency operation If during water tank heating the solar panel temperature exceeds Tcmax the circulation pump is being started by force in order to cool the solar panel The previous mentioned will be fulfilled despite of the water tank temperature at its lowest part T2 could exceeded Tzad relay output 1 If during the above mentioned emergency mode the water tank temperature at its lowest part reaches the critical maximum value Tbmax then the circulation pump is being switched off never mind it could reflect to solar panel overheating Thus the water tank temperature has a higher priority than the
3. circulation pump 2 is being stopped in case of reaching Tzad1 equalizing At with dT or with decreasing of T2 concerning water tank 1 bellow Tzad In the last case after circulation pump 2 is being switched off circulation pump 1 is being switched on for heating of water tank 1 Ifunder the above mentioned conditions the solar panel temperature is going down bellow Temin then both circulation pumps operation will be stopped by force despite of conditions At gt dT and T2 lt Tzad T3 lt Tzad1 could be available relay output 1 and 2 in case the solar panel temperature falls bellow Tdef circulation pump 1 is being switched on by force never mind it has been switched off due to solar panel temperature decreasing bellow Temin only in case the defrost option is activated if during the previous mentioned operation mode water tank 1 temperature falls down bellow Tbmin then the circulation pump is being switched off as the solar panel defrosting is being stopped B Emergency operation if during water tanks heating the solar panel temperature exceeds Temax the circulation pumps are being started by force in order to cool the solar panel The previous mentioned will be fulfilled despite of temperatures T2 and T3 of the water tanks could exceed Tzad and Tzad1 relay output and 2 if during the above mentioned emergency mode the water tank temperatures reach the critical maximum value Tbmax then the circulation pumps are being switche
4. INTIEL Programmable Differential Thermostat TD 3 3 User s Manual a E E E E a T a INTIEL tel 00359 596 333 66 I fax 00359 596 325 80 III info O intiel com www intiel com 9 Peter Beron Str Pomorie 8200 Bulgaria I Application Differential Thermostat DT 3 3 is used for a domestic hot water preparation where the heating of the water tanks is provided in a combined way by solar panels and electrical heating elements It is designed to control the operation of one or two circulation pumps installed in the water circuit between the solar panels and water tank serpentine thus regulating the heat exchanging between them II Functionality DT 3 3 has an ability to control two main types of installations for a domestic hot water preparation by means of solar or heating systems depends on the selected program 2 1 Systems equipped with one water tank default program the differential thermostat follows the temperature of the solar panel T1 the temperature of the lowest part of the water tank T2 and the temperature of the upper part of the water tank T3 2 2 Systems equipped with two water tanks the differential thermostats follows the solar panel temperature T1 the temperature of the lowest part of water tank 1 T2 and the temperature of lowest part of water tank 2 T3 The heating of water tank 1 is with a higher priority than water tank 2 III Operation The Thermostat is equipped with three temperatur
5. d off never mind it could reflect to solar panel overheating Thus the water tank temperature has a higher priority than the solar panel one when temperature T3 in water tank 2 exceeds Tvmax a valve is being switched on in order to drain the hot water of the water tank relay output 3 IV Front panel indications On the front panel are located the control elements and programming These are two line LCD display seven light indications and three buttons button up button down and button SET The front panel vision is shown at Figure 1 bellow 4 1 Light indication 1 shows the operation of circulation pump 1 4 2 Light indication 2 shows the operation of circulation pump 2 in case two water tanks are installed or heating of the water tank by means of electrical heating elements 4 3 Light indication 3 shows switched on valve for hot water draining 4 4 Light indication 4 shows emergency situation with the solar panel for example a maximum solar panel temperature is being reached or a defrost protection is activated 4 5 Light indication 5 show an emergency situation the temperature in water tank 1 has being reached the maximum allowed water tank temperature Tbmax 4 6 Light indication 6 show an emergency situation the temperature in water tank 2 has being reached the maximum allowed water tank temperature Tbmax 4 7 Light indication 7 shows that the unit is in a Vacation regime After con
6. e sensors mounted respectively at the water tank tanks and at the solar panels During its operation the thermostat monitors the following parameters 3 1 dT At adjusted and current real difference between the water tank and solar panel temperatures dT can be adjusted in the range of 2 up to 20 C The default setting is 10 C 3 2 Tzad W assigned temperature level of the water tank to which it can be heated from the solar panels The temperature can be adjusted in the range between 30 and 80 C The default setting is 60 C 3 3 Tzad1 W1 assigned temperature in the second water tank in systems with 2 water tanks or an assigned temperature at the upper part with systems with one water tank The default setting is 60 C 3 4 Tomax critical maximum allowed water tank temperature It can be adjusted in the range between 80 and 100 C The default setting is 90 C 3 5 Tbmin minimum water tank temperature bellow which the solar panel defrosting is being stopped It cannot be adjusted The default setting is 20 C 3 6 Tcmin minimum temperature level of the solar panel It can be adjusted in the range between 25 and 50 C The default setting is 40 C 3 7 Temax maximum allowed temperature of the solar panel It can be adjusted in the range between 90 and 110 C The default setting is 110 C 3 8 Tdef defrost temperature level of the solar panel It can be fixed in the range between 20 up to 10
7. for water tank1 water tank2 temperature sensors T3 Pt 1000 sensor is to be connected to those terminals To terminals 13 17 and 21 are to be connected a phase neutral and protection ground of the grid To terminals 11 9 and 7 are to be connected respectively circulation pump 1 circulation pump 2 electrical heating elements and a valve A phase L1 appears at terminals 12 10 and 8 when it does not at terminals 13 17 and 21 and an opposite VII Hydraulic connections A Systems equipped with one water tank The water tank heating is provided by means of solar panel and electrical heating elements Temperature sensor T1 Electrical heating element switch Temperature sensor T3 Temperature sensor T2 Differential Thermostat DT 3 3 Circulation Pump bT blocking thermostat PT operation thermostat B Systems equipped with two water tanks The water tank heating 1s provided by means of solar panels Temperature sensor T2 Temperature sensor T3 VIII Technical data Supply voltage Maximal rated current Outputs Switch on difference Sensors Sensor current Range of temperature measuring Digital display Measurement precision Humidity Protection Temperature sensor T1 Circulation Pump 2 Y A YOY o Differential Thermostat DT 3 3 MOO O O Circulation Pump 1 230V AC 50 60Hz 7A 250V AC 50 60Hz 3 standard relays c
8. hangeover contacts AT 2 20 C adjustable 3 temperature sensors Pt1000 50 mo 200 C 2 6 mA from 20 up to 120 C Two lines LCD 1 C 0 80 IP20 Parameters Indications A Temperature Default Clients Describtion SS s Range settings settingsa between the solar panel and the water tank Assigned temperature until which Tzad W the water tank can be heated by 30 80 C 60 C means ofthe solar panels Assigned temperature in second water tank with two water tanks O Tzad1 NONE o ce W1 systems and assigned temperature 60 C at the upper water tank part with systems with one water tank temperature C Minimum water tank temperature bellow which the solar panel antifreezing is 20 C being stopped Maximum allowed solar panel temperature he ae Minimum solar panel temperature 25 50 C Po l Solar panel temperature level at Tdef which the ant freezing protection 20 10 C is being activated Maximum water tank temperature at Tvmax which the relay output 3 is being activated Warranty The warranty period 1s 24 months following the purchase date of the unit or 1ts installation by an authorized Engineering Company but not exceeding 28 months after the production date The warranty is extended to the malfunctions that occur during the warranty period and are result of the production reasons or defective used parts The warranty does not relate to malfunctions corresponding to not qualified installatio
9. n activities directed to the product body interference not regular storage or transport The repairs during the warranty period can be done after correct filling of the manufacturer warranty card
10. nection of the power supply the thermostat goes into an initial mode as it shows the solar panel and water tank tanks temperatures INTIEL Differential Thermostat v3 3 V Programming 5 1 Entering the thermostat menu By pressing and holding the SET button for more than 3 seconds With the up and down to navigate forwards and backwards in the menu Change the selected item by pressing of a button SET Figure 1 A when the value is changed after pressing the button SET value start flashing changing it is done by pressing up or down Confirm the selected value again with SET Vacation Regime Mode is designed for cases where tanks is not used for a long time When activated the temperature of the water heater is set at 40 C and the inclusion of electric heaters is terminate Pumps turns as necessary in order avoid overheating the water heater or the panel Save amp Exit Save Settings and exit from the menu 5 Menu Password Allows access to the menu to be restricted by password When selecting enable the option is activated You can change the password from the following setting Renew Password The default password the one that the manufacturer supplies the controller is 000 After Menu Password is enable to enter the menu you must enter the correct password Press the SET button and the up down select the appropriate number press the SET button again to select the other two digits of the password If the password i
11. s entered incorrectly three times the controller returns to working condition If within 5 seconds not start entering the password access the menu but with limited rights You can browse the selections and parameters they can not be changed except for the vacation regime In Menu Password disable menu access does not require a password If a period of 30 sec no buttons are pressed 1t should automatically exit the menu as the changes are not saved in memory In this case they will be valid until it is stopped power One of Two water tanks Anti freezing protection Figure 2 VI Wiring The wiring of the thermostat includes connection of the temperature sensors power supply controlled circulation pump electrical heating elements and a valve according Figure 3 The IO temperature sensors are Pt 1000 non polar ones In case of necessity the connection cables of the sensors could be prolonged as the total resistance of both cores of the cable will be observed an indication sensibility of 1 C 4Q The recommended so P1000 cable length which does not boiler2 panel Pt1000 affect the measurement boiler1 precision is up to 100m 6 Terminals 1 and 2 are inputs for solar panel temperature sensor T1 Pt 1000 sensor is to be connected to those terminals Terminals 3 and 4 are inputs for water tank 1 temperature sensor T2 Pt 1000 sensor is to be connected to those terminals Terminals 5 and 6 are inputs
12. solar panel one When the water tank temperature at its upper part T3 exceeds Tvmax a valve is being switched on in order to drain the hot water of the water tank relay output 3 Installations equipped with two water tanks A Normal operation The circulation pump 1 is being switched on and the heating of the water tank is being started by means of the solar panels if temperature T2 in water tank 1 is lower than the assigned one Tzad and if there is a positive difference At between the solar panel and the water tank temperatures grater than the assigned dT T1 T2 gt dT The circulation pump is being stopped if during water tank heating At is being decreased thus after At gets equalized with the assigned one dT The heating of the water tank at the above mentioned conditions is going until the water tank temperature is getting the same with the assigned one Tzad Afterwards the pump is being switched off and the heating is being stopped relay output 1 when water tank reaches its assigned temperature then the operation of circulation pump 1 is being stopped and the heating of the second water tank is being started as circulation pump 2 is being switched on In this case circulation pump 2 will be started in case temperature T3 in water tank 2 is lower than Tzad1 and there is a positive difference At between solar panel and water tank grater than the assigned one temperatures dT T1 T3 gt dT relay output 1 and 2 the operation of
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