Intiel DT-3.1 User manual

INTIEL
THE ELECTRONICS ON YOUR SIDE
PROGRAMMABLE CONTROLLER FOR SOLAR SYSTEMS
DT 3.1
USER'S GUIDE
INTIEL LTD
10, str. Major Kolontaevski e-mail: office[email protected] ee
8200 Pomorie e-mail: [email protected]
BULGARIA www.intiel.com

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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)

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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 (∆Т)–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 Тbmax –Critical, maximum allowable temperature in the boiler. It is set
between 80 and 100 °C. Default setting is 95 °C;
2.4 Тpmin –Minimum temperature of solar panels. It is set in the range from
20 to 50 °C. Default setting is 40 °C;
2.5 Тpmax –Maximum permissible temperature of solar panels (fireplace). It
is set between 80 and 110 °C. Default setting 105 °C;
2.6 Тpdef –Defrosting temperature of solar panels. It is set in the range -20 to
10 °C. Default setting without defrost - OFF;
2.7 Тbmin –Minimum temperature in the boiler below which the defrosting
of the panel is stopped. Cannot be set. Default setting is 20 °C;
2.8 tcool –Time to delay the boiler cooling function to the set Tbset
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. The default 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.

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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:
А) Normal operating modes
- If the differential temperature (∆t) of the solar panel (fireplace) and the
boiler is greater than the set point ∆Т + 2 °C, the pump is switched on and the boiler
is heated from the panels. In the process of heating the boiler, ∆tdecreases. Once
the actual ∆tis aligned with the set ∆Т, 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 ∆Т and ∆t. The smaller the difference, the longer the
interval for pump operation and the smaller the pause. When ∆tbecomes 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 Тpdef and the anti-freeze function
enabled, the pump is forced to start, even though it was switched off due to the
temperature drop below Тpmin;
- If in the previous mode the temperature of the boiler becomes lower than
Тbmin, the pump is switched off by stopping the defrosting of the panels;
В) "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. The pump is switched on when necessary to prevent the
panel from overheating (Тpmax).
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 Tbset;
- If in the above emergency mode the temperature in the boiler reaches the
critical maximum value Тbmax,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 tcool
(tcc). Default setting is 4 hours.

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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.
1 –An indicator of the temperature of the solar panels, as well as a part of
the menu showing the parameter to be adjusted;
2 –Boiler temperature indicator, as well as part of the menu showing the
value of the parameter to be set;
3 –Real differential difference (∆t) represented graphically;
4 –Icons giving additional information about the status of the system:
The temperature of the solar panels is over Тpmax;
Indication of negative temperature of the solar panel;
Solar panel defrost activated;
The circulation pump is on;
"Vacation" mode is on;
The water temperature in the boiler is higher than Тbmax or
lower than Тbmin;
Fig.1

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"Settings" menu;
The button to access the "Settings" menu is disabled.
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 "▲" и "▼" 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 "Еnd 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 "▲" и "▼". 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 Тbmax;
-when the water temperature in the boiler drops below Тbmin.
5.2 –Icon lights up when solar panels temperature above Тpmax.
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 °С.
- 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.

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6. Electrical connection
Electrical connection includes sensor connection, mains supply and controlled
pump according to Figure 2. The sensors are Pt1000 type –non-polar.
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°С/4Ω. 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, 2 and 3 are supplied with neutral,
phase and protective earth respectively from the
mains.
The pump is connected to terminals 4, 5 and 6, on which protective earth, neutral
and phase come out, respectively. A phase (L2) is output on terminal 7, while it is
not output on terminal 6 (L1).
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.
Fig.2

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7. Exemplary hydraulic connection diagrams
А) Heating the boiler only from solar panels
B) Heating the boiler from solar panels and electric heaters
RT - working thermostat of the boiler
BT - blocking thermostat of the boiler
Фиг.2
Panel sensor
Boiler
Circulation pump
Boiler sensor
Solar
panel
L1
N
PE
L
N
PE
Differential
thermostat
BТ
RТ
Electrical heating
element switch
Panel sensor
Boiler
Circulation pump
Boiler sensor
Solar
panel
L1
N
PE
L
N
PE
Differential
thermostat

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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
Sensor
Fireplace
Heating
N
PE
L2
L1
м
Boiler sensor
Boiler
Open
Close
Differential
thermostat
L
N
PE
Heating
pump
Electrical heating
element switch
RТ
BТ
L1
N
PE
Sensor
Fireplace
Heating
Heating
pump
Boiler sensor
Boiler
Differential
thermostat
L
N
PE

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Table 1
P A R A M E T E R
Indication
Description
Range
Default
settings
User
settings
dt
Set temperature difference
between the solar panels and
the boiler - ∆T
2 ÷ 20 °С
10 °С
tbS
Set temperature in the boiler
to which it can normally be
heated by the solar panels.
Tbset
10 ÷ 80 °С
60 °С
Minimum temperature in the
boiler below which the
defrosting of the panels
stops. Тbmin
not set
20 °С
tbH
Maximum allowable
temperature in the boiler.
Tbmax
80 ÷ 100 °С
95 °С
tPL
Minimum temperature of
solar panels.Трmin
20 ÷ 50 °С
40 °С
tPH
Maximum allowable
temperature of solar panels.
Трmax
80 ÷ 110 °С
105 °С
tPd
Temperature at which solar
panels are allowed to
defrost. Тpdef
-20 ÷ 10 °С
OFF
ttc
Cooling delay time to set
temperature.
0 ÷ 5 h.
4 h.
Tb correct
Correction of the indication
temperature Tb
-10 ÷ 10 °С
0 °С
Tp correct
Correction of the indication
temperature Tp
-10 ÷ 10 °С
0 °С

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8. Technical data
Power supply ~230V/50-60Hz
Switching current 7А/~250V/ 50-60Hz
Number of output contacts one relay
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 not-
qualified 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