INTIEL DT 3.1.1 Programmable Controller User Guide
- June 9, 2024
- INTIEL
Table of Contents
INTIEL DT 3.1.1 Programmable Controller User Guide
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PROGRAMMABLE CONTROLLER FOR SOLAR SYSTEMS TECHNICAL DESCRIPTION
⚠ Safety instructions:
– Before installation, check the integrity of the unit and its connecting
wires.
– In case of damaged can not be mounted to the removing of the fault.
– The installation and disassembly of the unit must be carried out by
qualified personnel who have previously read the product manual.
– Mount in a dry and ventilated place away from heat sources and flammable
gases or liquids.
– Make sure that the mains voltage matches the voltage on the rating plate of
the unit.
– Use power consumers that match the power output of the appliance.
– In the event of malfunctioning, switch off the appliance immediately and
seek authorized service for repair. – In case of fire, use a fire
extinguisher.
– For the purpose of environmental protection, do not throw away electrical
appliances and their packaging marked with a symbol crossed bin
Contents of the package:
– The controller
– Sensors type Pt 1000-2 pcs.
– User guide (warranty card)
1. Application
The solar controller is integrated into domestic hot water systems in boilers (water heaters), combined with solar panels (fireplaces) and electric heaters. It is designed to monitor the differential temperature and to control the operation of a circulation pump mounted in the water circuit between the panels (fireplace, boiler) and the boiler coil. This regulates the heat exchange between them, helping to make the system more efficient.
2. How it works
The controller has two temperature sensors installed in the water heater and
the solar panels. The operation of the controller is determined depending on
the set parameters and the measured temperature. The following parameters are
monitored during operation:
2.1 delta T () Set difference between panel and boiler temperatures
(differential difference). It can be set between 2 and 20 °C. Default setting
is 10 °C;
2.2 Tbset Set temperature in the boiler to which it can normally be heated
by solar panels (fireplace, boiler). It is set in the range from10 to 80 °C.
Default setting is 60 °C;
2.3 bmax Critical, maximum allowable temperature in the boiler. It is set
between 80 and 100 °C. Default setting is 95 °C;
2.4 pmin Minimum temperature of solar panels. It is set in the range from 20
to 50 °C. Default setting is 40 °C;
2.5 pmax Maximum permissible temperature of solar panels (fireplace). It is
set between 80 and 110 °C. Default setting 105 °C;
2.6 pdef Defrosting temperature of solar panels. It is set in the range -20
to 10 °C. Default setting without defrost – OFF;
2.7 bmin Minimum temperature in the boiler below which the defrosting of the
panel is stopped. Cannot be set. Default setting is 20 °C;
2.8 Thset Set temperature in the boiler, up to which it can be heated by
electric heaters. It is set within range from 5° to Tbset-5 °. Default setting
is 45°;
2.9 EL.H – Algorithm for control of electric heaters;
2.8 tool Time to delay the boiler cooling function to the set Best
temperature. The controller will wait for the time specified in this setting
to expire and if the condition is met
Tp<Tb-2 °C, will turn the pump on until it reaches Tbset. Default setting is 4
hours.
If necessary, a correction can be made in the readings of the measured
temperatures:
Tbc Correction of the reading from the boiler temperature sensor; Tpc
Correction of the reading from panel sensor; The setting is in the range -10
to + 10 °C. Default setting is 0 °C.
Deviations in the readings of the temperature values can be the result of
cables that
are too long or from poorly positioned sensors.
The operation of the controller is determined depending on the set parameters
and the measured temperature of the solar panel and the boiler as follows:
A) Normal operating modes – If the differential temperature (t) of the
solar panel (fireplace) and the boiler is greater than the set point + 2 °C,
the pump is switched on and the boiler is heated from the panels. In the
process of heating the boiler, t decreases. Once the actual t is aligned with
the set , at certain intervals, a start and stop signal from the relay output
is sent to the pump. The work and pause intervals depend on the difference
between and t. The smaller the difference, the longer the interval for pump
operation and the smaller the pause. When t becomes equal to or less than
zero, the pump stops. Adjustment is with a period of 600s (10 min).
– The boiler is heated under the above conditions only until the temperature
in the boiler is equal to the set Tbset, after which the pump is switched off
and the heating is stopped;
– If the temperature of the panels (fireplace, boiler) falls below Tpmin, the
pump operation is prohibited, even though the conditions t>T+2 °C and Tb<Tbset
may be present;
– At the temperature of the panels below pdef and the anti-freeze function
enabled, the pump is forced to start, even though it was switched off due to
the temperature drop below pmin;
– If in the previous mode the temperature of the boiler becomes lower than
bmin, the pump is switched off by stopping the defrosting of the panels;
Heating the boiler with electric heaters. By setting EL.H an algorithm for the
control of the heaters is selected as follows: OFF heating with electric
heaters is prohibited; F1 heating with electric heaters is allowed, when
there are no conditions for heating from the panels, the temperature in the
boiler is lower than Thset and 10 min have passed during which the pump did
not work;
F2 heating with electric heaters is allowed until Thset is reached,
regardless of pump status.
Default setting F1. Heating with electric heaters is prohibited when
“Vacation” mode is activated.
B) “Vacation” mode. The mode is intended for cases when no hot water is
consumed from the boiler for a long time. When activated, the set boiler
temperature is set to 40 °C and the start of the heaters is forbidden. The
pump is switched on when necessary to prevent the panel from overheating
(pmax).
Activate/deactivate the mode – by pressing and holding “” button for more than
3 seconds. After releasing the button, an icon lights up on the display.
C) Emergency modes – If during the boiler heating process the temperature
of the panels (fireplace) exceeds Tpmax, the pump is forced to cool the
panels. This is done even though the temperature in the boiler may exceed
Best; – If in the above emergency mode the temperature in the boiler reaches
the critical maximum value bmax, the pump is switched off even though this may
cause the panels to overheat. Thus the temperature in the boiler is of higher
priority; – When the temperature of the boiler Tb is above the set Tbset and
when the temperature of the solar panels Tp falls below the temperature of the
boiler, the pump is switched on until the temperature Tb drops to the set
Tbset.
This cooling can be delayed from 0 to 5 hours. Sets using the parameter tool
(tcc). When combined heaters with electric heaters are used, the Thset
reference must be lower than Tbset. Default setting is 4 hours.
3. Front panel
The front panel contains the monitoring and control elements. custom LED display with numbers and symbols and buttons. The appearance of the front panel is shown in Figure 1.
LED display (1). Provides visual information about the current values of the measured values and the status of the system, through symbols (icons), as well as the ability to set the controller through a user menu.
- An indicator of the temperature of the solar panels, as well as a part of the menu showing the parameter to be adjusted;
- Boiler temperature indicator, as well as part of the menu showing the value of the parameter to be set;
- Real differential difference (t) represented graphically;
- Icons to provide additional information about a finding of the system:
Button functions:
“▲” (3) scroll forward in the menu, increase value;
“▼” (4) scroll back in the menu, decrease value;
“■ ” (5) access menu, select, save changes.
4. Settings
After the power is turned on, the thermostat starts in the initial state, in
which it displays the temperature of the water heater and solar panels. To
access the settings menu, press the button “■”. Icon lights up on the display.
Use buttons “▲” “▼” to select a parameter. To change its value, press a button
“■”. The value will start flashing, you can change it using buttons “▲” and
“▼”. To confirm and record in the memory, press the button “■”. All
parameters, the range in which they can be changed as well as their default
values are described in Table 1.
To exit from the menu select “nd SEt” and press the button “”. If no button is pressed for 15 seconds, the controller automatically exits from the menu. If this happens while changing a value (the value is flashing), then the change will not be stored in memory.
Lock menu access The menu can be locked to prevent unintentional changes to settings. This is done by simultaneously pressing and holding for 2 seconds the buttons “” “”. After releasing the buttons, an icon indicating activated protection lights up on the display.
To unlock the menu, the buttons “▲” and “▼” must be pressed and held again for 2 seconds.
5. Emergency alarm conditions
5.1 Icon lights up in the following cases:
– when the water temperature in the boiler exceeds bmax;
– when the water temperature in the boiler drops below bmin. 5.2 Icon lights
up when solar panels temperature above pmax.
5.3 Icon lights up when temperature of the solar panels is negative.
5.4 When measured temperature of the boiler or solar panels is outside the
defined range from -30° to +130 °.
– when any of the temperatures are higher than +130 °C appears “tHi” on the
display; – when any of the temperatures are lower than -30 °C appears “tLo” on
the display.
6. Electrical connection
Electrical connection includes sensor connection, mains supply, controlled
pump and electrical heaters according to Figure 2. The sensors are Pt1000 type
nonpolar.
If necessary, the connecting
cables of the sensors can be extended, taking into account the total
resistance of the two wires – sensitivity of the indication 1°/4. A
recommended length that does not affect the measurement is up to 100m.
Terminals 8, 9 are input for the sensor from the solar panels. Terminals 10,
11 are input for the sensor from the boiler. A Pt1000 sensor is connected to
them.
Terminals 1 and 2 are supplied with phase and neutral from the mains.
The pump is connected to terminals 3, 4, where zero and phase are output respectively. Terminals 5 and 6 are independent contacts for sending a start / stop signal to electrical heaters.
Attention: In order to remove the static electricity that accumulates in the solar panels, it is mandatory that they as well as their metal structure to be grounded. Otherwise, there is a risk of damaging the sensors as well as the controller.
7. Exemplary hydraulic connection diagrams
A) Heating the boiler only from solar panels
RT – working thermostat of the
boiler
BT – blocking thermostat of the boiler
C) Heating of the boiler only from a fireplace and an “open – closed” magnet
valve.
D) Heating of the boiler from fireplace and electric heaters.
RT – working thermostat of the boiler
BT – blocking thermostat of the boiler
Table 1
8. Technical data
Power supply ~230V/50-60Hz
Switching current 3A (7А optional)/~250V/ 50-60Hz
Number of output contacts two relays
Differential temperature 2° – 20 °С
Sensor type Pt1000 (-50° to +250 °C)
Current through the sensor 1mA
Measuring range -30° to +130 °C
Display type custom LED indication
Unit of measurement 1 °С
Environmental temperature 5° – 35 °C
Environmental Humidity 0 – 80%
Degree of protection IP 20
9. Warranty
The warranty period is 24 months following the purchase date of the unit or
its 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 notqualified
installation, 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.
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>