INTIEL DT-3.1 Programmable Differential Thermostat User Manual

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INTIEL  

THE ELECTRONICS ON YOUR SIDE  

Programmable Differential Thermostat  

DT-3.1  

User’s Manual  

І. Application  

Programmable Differential Thermostat DT-3.1 is used for domestic hot water preparation in water heaters, where the  

heating energy is provided in combined way, by solar panels (fireplace) and electrical heating elements. It is designed to control  

the circulation pump operation, installed in the water circuit between the solar panels (fireplace) and the water heater  

serpentine, this regulating the heat exchanging between them.  

II. Operation  

The thermostat has two temperature sensors mounted respectively in the boiler and solar panels. During an operation the  

thermostat monitors the following parameters:  

2.1. ∆Т, ∆t – adjusted and current (real) difference between the water heater and solar panel temperatures. ∆Т can be  

adjusted in the range of 2 up to 20°С. The default setting is 10°С  

2.2. Wb – adjusted temperature level of the water heater to which it can be heated from the solar panels. The  

temperature can be adjusted in the range between 30 and 90°С. The default setting is 60°С.  

2.3. Tb_max – maximum allowed water heater temperature. It can be adjusted in the range between 80 and 100 °С. The  

default setting is 95°С.  

2.4. Tp_min – minimum temperature level of the solar panel. It can be adjusted in the range between 20 and 50 °С. The  

default setting is 40°С.  

2.5. Tp_max – maximum allowed temperature of the solar panel. It can be adjusted in the range between 80 and 110°С.  

The default setting is 105°С.  

2.6. Tp_defrost – defrost temperature level of the solar panel. It can be fixed in the range between -20 up to 10°С. The  

default setting is “- -“, without defrosting.  

2.7. Tb_min – minimum water temperature level in the water heater. It cannot be adjusted. The default setting is 20°С  

Differential Thermostat DT-3.1 operation depends on the temperature sensor states, as follows:  

А) Normal operation  

- In case of a positive temperature difference Δt between the solar panel (stove) and the water tank, greater than the set  

ΔT of 3 ° C, the pump starts operation, thus heating the tank from the panel.  

A timer is being switched on when ∆t gets equal to ∆T, as from this moment the controller counts 10 minutes of  

circulation pump operation. That time can vary within above range of 10 minutes as decreasing the difference between ∆t and  

∆T to 0 relates to less operation time of the pump, which the device count automatically. The pump operation stops if the  

previous mentioned difference becomes 0 or less than 0.  

- Heating the water tank under the above conditions can be made only until the temperature in the water tank gets equal  

to the set one Wb, then the pump switches off, stopping the heating.  

- If the above conditions are fulfilled, and the solar panel (stove) temperature falls below Tpmin, the pump stops, even  

the following conditions ∆t>∆Т+3° and Тб< Wб are fulfilled.  

- If the temperature of the panel falls below Tpdefrost the pump is being switched ON, although it has been switched off  

because solar panel temperature is below Tpmin.  

В) VACATION Mode - The current mode is useful in case of not using the water tank for a long time. In case of the mode  

activation the adjusted temperature is being automatically set to 40 °С, as the heating elements switching on is not allowed. The  

pump is being switched on when it is necessary in order to prevent the overheating of the tank or the solar panel. The mode can  

be activated by means of pressing “PROGRAM” button for 3 seconds, as after its releasing on the display appears ON/OFF  

indication. When activated, the indication flashes “HOL”.  

В) Emergency operation  

- If during water heater warming the solar panel (stove) temperature exceeds Tp_max , the circulation pump will be  

switched on by force in order to provide the solar panel cooling. The previous mentions will be done despite of the water heater  

temperature can exceed Wb.  

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General	Details
Name	INTIEL DT-3.1 Programmable Differential Thermostat User Manual
Make	INTIEL
Language	English
Filetype	PDF (Download)
File size	0.18 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• INTIEL

INTIEL DT-3.1 Programmable Differential Thermostat User Manual Overview

Summary of Contents

• Page 1: Programmable Differential Thermostat DT-3.1 is used for domestic hot water preparation in water heaters. It is designed to control the circulation pump operation between the solar panels and the water heater serpentine. The thermostat has two temperature sensors mounted in the boiler and solar panels. The adjusted and current difference between the water heater and solar panel temperatures can be set between 2 to 20°C. The adjusted temperature level of the water heater can be set between 30 and 90°C. The maximum allowed water heater temperature can be set between 80 and 100°C. The minimum temperature level of the solar panel can be set between 20 and 50°C. The maximum allowed temperature of the solar panel can be set between 80 and 110°C. In vacation mode, the adjusted temperature is automatically set to 40°C, and heating elements are not allowed to switch on. If the solar panel temperature exceeds the maximum allowed temperature, the circulation pump will be switched on to cool the solar panel.
• Page 2: If the water heater temperature reaches its maximum allowed temperature, the circulation pump will stop to prevent overheating of the solar panel. When the water tank temperature is above the assigned level and greater than the solar panel temperature, the circulation pump will be switched on to prevent water tank overheating. The front panel contains elements for control and programming, including three digital displays, ten light indications, and two buttons, “SELECT” and “PROGRAM”. The digital display shows various temperature readings, including water heater temperature, solar panel temperature, and maximum allowed water heater temperature. The thermostat automatically goes into start mode after connection to the power supply, showing the water heater temperature. The inspection of water heater and solar panel temperatures can be done by pressing the “SELECT” button. Programming of temperatures can be initiated by pressing the “PROGRAM” button, allowing adjustments to be made during the blinking time. The adjustment of temperature values is accepted if the “SELECT” button is not pressed before the 10th blink. After programming all temperatures, the thermostat will go into start mode with the new adjusted values becoming current. You can return to the inspection of temperatures after completing the programming of all temperature settings.
• Page 3: For quick change of selected value, hold the “SELECT” button. The light indication Alarm will be activated when the water heater temperature exceeds Tb max. The light indication Alarm will also activate when the temperature of the solar panel is above Tpmax or below Tp defros, if defrost mode is allowed. When one of the temperatures is greater than +120°C, “Hi” will be indicated on the digital display. When one of the temperatures is lower than -20°C, “Lo” will be indicated on the digital display. The wiring comprises the connection of temperature sensors, a power supply, and the circulation pump. The sensors are Pt1000 – non-polar. The recommended cable length that does not affect measurement precision is up to 100m. Terminals 8 and 9 are input for the Pt1000 solar panel sensor. A ground connection is to be provided to discharge static electricity that could appear on the solar panels.
• Page 4: Domestic hot water preparation by means of solar panels and electrical heating elements of the water tank. Water tank operation thermostat. Water tank emergency (blocking) thermostat. Domestic hot water preparation by a fireplace and a motor actuator “open – close” for the water heater. Domestic hot water preparation by a fireplace and water heater electrical heating elements. Water tank operation thermostat. Water tank emergency (blocking) thermostat.
• Page 5: Technical data Supply voltage: 230V / AC / 50-60Hz Maximal rated current: 7 A / 250V / AC / 50-60Hz Outputs: 1 standard relay Switch-on difference: ΔT 2…20°C adjustable Sensors: 2 temperature sensors Pt1000 (-50° to +200°C) Warranty The warranty period is 24 months following the purchase date of the unit or its installation by an authorized Engineering Company. The warranty does not relate to malfunctions corresponding to not-qualified installation. Repairs during the warranty period can be done after correct filling of the manufacturer warranty card.