Intiel DT 3.2.2 User manual

INTIEL LTD
10, str. Major Kolontaevski e-mail: office[email protected] ee
8200 Pomorie e-mail: [email protected]
BULGARIA www.intiel.com
INTIEL
THE ELECTRONICS ON YOUR SIDE
PROGRAMMABLE CONTROLLER FOR SOLAR
SYSTEMS
DT 3.2.2
USER'S GUIDE

2
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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І. Application
The solar controller is integrated into domestic hot water systems in boilers,
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.
ІI. Front panel
The front panel contains the monitoring and control elements. These are graphical
(LCD) displays, LED indicators and buttons. The appearance of the front panel is
shown in Figure 1.
The graphic display (1) is 128x64 pixels and backlit. Provides visual information
about the current values of the measured values and the status of the system, through
graphic images and symbols (icons), as well as the ability to set the controller through
a user menu.
LED indication (2) - Alerts for emergency operation.
Adjustment buttons:
„▲” –(3) scroll up the menu, increase value;
„▼” –(4) scroll down through the menu, decrease in value;
„ ▄” –(5) menu access, selection, saving change.
Fig.1

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2.1 Display
Basic versions of the solar system:
• Heating of a solar panel boiler and electric heaters (1a);
• Heating of the boiler by the fireplace (boiler) and electric heaters (1b).
Schemes should not be considered complete.
Depending on the particular application, there may be additional ones
components and safety components that may be required, such as check valves, shut-
off valves, etc.
The controller is not a substitute for safety devices.
2. Field of icons, provides additional information about the state of the system
(see Table 1);
3. Hour and day of the week field. The date is displayed in the menu only;
4. Pump control type:
- REL –pump control via relay output (terminals 5 and 6). Used for standard
pumps. PWM and DCV outputs are off;
- PWM –control of the pump by pulse width modulation (terminals 9 and
10). Used to change the speed of high-efficiency pumps. When a PWM
output is switched on, a relay output is also included, which can be used to
power the pump;
- DCV –pump control via 0-10V signal (terminals 11 and 12). Used to
change the speed of high-efficiency pumps. When the DCV output is
switched on, the relay output is also switched on.

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Table 1
ICONS
image
description
Anti-freeze function enabled
Triggered function against bacteria
"Legionella"
Warning of a dangerous condition
(excessive high or low temperature)
Mode activated "Holiday"
Weekly program included
The menu is locked
Pump. When the pump is running,
the icon rotates.
Pump. Manual mode
Other display symbols:
solar panel
water heater
fireplace (boiler)
day - indicates the bright part of the day. The time from at sunrise until
sunset (light period)
night - indicates the dark part of the day. The time from at sunset until
sunrise.
The length of the day and night periods is different and is calculated approximately
according to the season and location (latitude) of Sofia.

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III. Structure and description of the menu
The graphical mode in which the measured parameters are monitored and the status of
the system appears immediately after the operational power is supplied to the
controller or when no button is pressed for 30 seconds.
To access the main menu, press the "▄" button. It allows you to select a time settings
submenu or a system controller submenu. The main menu is as follows:
Use the "▲", "▼" buttons to position the selector of the selected submenu and press
the button „ ▄” again.
3.1 Time Settings submenu
Use the "▲" and "▼" buttons to move the selector * up or down in the menu. To
change a setting, press the " ▄" button. The value will start blinking and then you can
select the desired value or parameter with the ▲ and ▼ buttons.
Press the button to confirm and save to memory „ ▄”.
If no button is pressed for 30 seconds, it will exit the menu automatically and return to
graphical mode.
Available functions and settings:
- Time to cool (hrs). Time to delay the boiler cooling function to the set Tbset
temperature. In case the boiler temperature exceeds the set temperature.
The controller will wait for the time specified in this setting to expire and if
the condition is met Tp < Tb-2°, will turn the pump on until it reaches Tbset. Default
setting - 0 hours (no wait).
For example: the boiler was heated to 75 degrees during the day at a set
temperature of 60 degrees, after the temperature of the solar panel drops below the

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boiler temperature, if no waiting time is set, the pump will start immediately and will
try to cool the boiler to the set temperature.
If a delay time of 5 hours is set, the pump will start to cool the water heater at about
22.00 hours and if no hot water has been used during this time. This way instead of
cooling the boiler immediately, customers will be expected to use hot water.
The setting "- -" is also possible, in this case the cooling function to the set
temperature is switched off;
- Anti-legionella. “Legionella pneumophila”is a bacterium that is a natural inhabitant
of water. The artificial environments in which it can reproduce are systems for
domestic hot water, buffers, water heaters, etc., with poor water quality or misuse.
Consuming such water can cause serious health problems.
The optimal temperature for the bacterium to develop is 38 ° C, at 50 ° C it
stops multiplying and at 70 ° C it is destroyed. The controller's anti-legionella function
monitors the temperature in the boiler and if within 7 days the temperature in the
boiler did not reach 70 ° C, temporarily raises the Tbset and Thset setting to 70 ° C.
Electric heaters are used for this purpose and the time at which the function starts
heating is 23:00 to 05:00.
- Default setting - ON;
- Date. Setting for day, month and year;
- Time. Setting the day of the week, hour and minutes for the clock;
- Week Program. Weekly Programmer function. Works only at selected value 2 for
setting "Heaters ctrl. Type "(see submenu" System Settings "). When activated, it
switches on the electric heaters at the selected time interval until Thset is reached. For
the rest of the time, the heaters can only be switched on if the temperature in the boiler
goes down to values below Tbmin. Default setting - OFF;
- Program. Program number. Up to 7 stand-alone weekly programs can be set up;
- Select days of the week that a weekly program is active:
- None - the weekly program is deactivated;
- All days - the weekly program is active on all days of the week;
- Weekdays - the weekly program is active for days Monday through Friday;
- Weekend weekly program is only active on Saturdays and Sundays;
Monday, Tuesday, Wednsday, Thursday, Friday, Saturday, Sunday - the ability to
choose any day of the week;
- ON. Start the active interval of the weekly program. The heaters will be turned on
until Thset is reached;
- OFF. End of the active interval of the weekly program. Heaters are only allowed at
Tb<Tbmin.
If the switch-on time in the same program coincides with the switch-off time,
switching off takes priority. If the time of inclusion coincides with two (or more)
programs, the assignment for the first one is valid.
For example:
P1 time ON = P1 time OFF - will be valid P1 OFF
P1 time ON = P2 time ON - will be valid P1 ON

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3.2 System Settings submenu
Use the "▲" and "▼" buttons to move the selector * up or down in the menu. To
change a setting, press the "▄" button. The value will start blinking and then you can
select the desired value or parameter with the ▲ and ▼ buttons.
Press the button „ ▄” to confirm and save to memory.
If no button is pressed for 30 seconds, it will exit the menu automatically and return to
graphical mode.
Available settings:
- System Type. Choosing a principle hydraulic scheme for the graphics mode.
There are two types of schemes:
solar - Heating of solar water heater and electric heaters.
kettle - Heating of the boiler by the fireplace (boiler) and electric heaters.
- Vacation. Vacation mode. Intended for cases where the consumption of hot water
from the boiler is not used for a long time. Default OFF;
- delta T (∆T). Set difference between panel and boiler temperatures (differential
difference). It can be set between 2 and 20 ° C. The default setting is 10 ° C.
The actual difference will be denoted by ∆t.
- 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.

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Default setting is 60 °C;
- Tbmin. Minimum temperature in the boiler below which the defrosting of the panel
is stopped. It is set in the range from 10 to 50°C. The default setting is 20 ° C;
- Tbmax. Critical, maximum allowable temperature in the boiler. It is set between
80 and 100 ° C. The default setting is 95 ° C;
- Tpmin (Tkmin). Minimum temperature of solar panels.
It is set in the range from 20 to 50 ° C. Default setting is 40 ° C;
- Tpmax (Tkmax). Maximum permissible temperature of solar panels
(fireplace, boiler). It is set between 80 and 110 ° C. Default setting 105 ° C;
-Tpdef. Defrosting temperature of solar panels. It is set in the range -20 to 10 ° C.
Default setting without defrost - -;
- Pump control. The pump type determines how the pump is controlled and its speed.
The following settings are possible:
- REL - standard pump included at the relay output;
- PWM - high-efficiency pump that is controlled by a pulse-width signal;
- DCV - highly effective pump which is controlled by a signal 0-10V.
- Heater ctrl. Type. Determines the algorithm by which electric heaters will be
controlled. The following settings are possible:
1- Electric heaters are prohibited while the circulation pump is running. The controller
can switch them on until Thset is reached but only if the pump has not been running
for more than 10 minutes;
2- the controller switches on the electric heaters according to the set weekly program
until reaching Thset;
3- electric heaters are allowed to reach Thset, regardless of the operation of the
circulation pump;
4 - Electric heaters are prohibited.
-Thset. Set temperature in the boiler to which it can be heated by electric heaters. It is
set in the range from 5 to Tbset-5 ° C. When changing the setting Tbset, if the above
condition can not be met, the controller automatically adjusts the Thset. The default
setting is 45 ° C;
- Tb correct. Correction of the reading from the boiler temperature sensor;
- Tp correct (Tk correct). Correction of the reading from the panel temperature sensor
(fireplace, boiler).
The temperature reading can be adjusted by Tb correct and Tp correct.
The setting is in the range -10 to + 10 ° C. The default is 0 ° C.
3.3 Lock menu
The menu can be locked to prevent inadvertent changes to settings. This is done by
simultaneously pressing and holding for more than 3 seconds the "▲" and "▼"
buttons. After releasing the buttons, a "key" icon appears on the display indicating that
the security is activated.
To unlock the menus, the "▲" and "▼" buttons must be pressed and held again for
more than 3 seconds.

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Table 2
P A R A M E T E R
Designation
Description
Range
Default
setting
Customization
∆T
Set the temperature
difference between the solar
panels and the boiler
2 ÷ 20° С
10° С
Tbset
Set temperature in the boiler
to which it can normally be
heated by solar panels
(fireplace, boiler)
10 ÷ 80° С
60° С
Тbmin
Minimum temperature in the
boiler below which the
defrosting of the panels
ceases
10 ÷ 50°С
20° С
Tbmax
Maximum allowable
temperature in the boiler.
80 ÷ 100°С
95° С
Трmin
Minimum temperature of
solar panels.
20 ÷ 50° С
40° С
Тkmin
Minimum boiler temperature
(fireplace)
20 ÷ 50° С
40° С
Трmax
The maximum permissible
temperature of solar panels
80 ÷ 110°С
105° С
Tkmax
Maximum permissible
temperature of the boiler
(fireplace)
80 ÷ 110°С
105° С
Тpdef
Temperature at which the
defrosting of the solar panels
is switched on.
-20 ÷ 10°С
--
Pump control
Method of controlling the
circulation pump
REL,
PWM,
DCV
REL
Heater ctrl.
Type
An algorithm for controlling
electric heaters
1 ÷ 4
1
Tb correct
Correction of the indication
temperature Tb
-10 ÷ 10°С
0° С
Tp correct
Correction of the indication
temperature Tb/ Tp(Tk)
-10 ÷ 10°С
0° С
Time to cool
Cooling delay time to set
temperature Tbset.
0 ÷ 5ч.
or „- - ”
0ч.
Anti-
legionella
Protection against Legionella
bacteria
ON/OFF
ON

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IV. How it works
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, boiler) and the
boiler is greater than the set point ∆T + 2 ° C, the pump is switched on at maximum
speed 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 ∆T.
Depending on the pump control mode selected, the following controller
reactions are possible:
- REL –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 ∆T and ∆t.
The greater the differential difference, the interval for when the pump is on is longer
and the pause is shorter. When ∆t becomes equal to or less than zero, the pump
stops. Adjustment is with a period of 600s.
- PWM –The pump speed is controlled by a pulse width signal, depending on the
difference between ∆T and ∆t.
The greater the differential difference, the higher the pump speed. When ∆t
becomes equal to or less than zero, the pump stops. For example, when setting the set
point ∆T = 10 ° C, the controller measured a real differential difference ∆t = Tp - Tb
= 5 ° C, then the signal supplied to the pump will have a fill factor of 50%, ie. it will
run at 50% of its maximum speed.
- DCV –The pump speed is controlled by a signal of 0-10V (0% to 100% speed) and
depends on the difference between ∆T and ∆t. The greater the differential difference,
the higher the pump speed. When ∆t becomes equal to or less than zero, the pump
stops.
- 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 ° and Tb
<Tbset may be present;
- At the temperature of the panels below Tpdef and the anti-freeze function
enabled, the pump is forced to start, even though it was switched off due to the
temperature drop below Tpmin;

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- If in the previous mode the temperature of the boiler becomes lower than
Tbmin, the pump is switched off by stopping the defrosting of the panels;
- The heating of the boiler by the electric heaters is controlled according to the
selected setting for Heater ctrl. Type (see section 3).
In case of defrosting of the panels, the heaters are allowed at the boiler
temperature below Tbmin, only for the selected system - "solar".
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 (except when the Anti-legionella option is enabled). The pump
is switched on when necessary to prevent the panel / Tpmax / from overheating.
C) Emergency modes
- If during the boiler heating process the temperature of the panels (fireplace,
boiler) exceeds Tpmax (Tkmax), 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 Tbmax, 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 water heater Tb is above the set Tbset and when the
temperature of the solar panels Tp falls below the temperature of the water heater, the
pump is switched on until the temperature of the water heater Tb drops to the set
Tbset.
This cooling can be delayed from 0 to 5 hours. Sets using the Time to cool
parameter (the default setting is 0). When combined heaters with electric heaters are
used, the Thset reference must be lower than Tbset.
D) Manual pump mode
The pump is switched on and running at maximum speed without taking into
account current settings and measured temperatures.
Manual mode can only be used by qualified personnel for short tests.
Activation and deactivation is performed by pressing and holding down the "▄" button
for more than 3 seconds. The letter "M" will be displayed next to the pump symbol
(see Table 1).
V. Emergency alarm conditions
5.1 Light signaling.
LED shall be activated for warning in the following cases:
- when the temperature in the boiler exceeds Tbmax;
- when the temperature of the panels is greater than the maximum Tpmax or with
activated defrost Tpdef;
5.2 Signaling related to temperature sensors.
Temperature range of measurement is -30 ° to + 140 ° C.
In the case of a faulty sensor or a measured temperature outside the range, the
temperature value shall be indicated in the place:

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- “Hi” Temperature higher than + 140 ° C or intermittent sensor.
- "low" Temperature lower than -30 ° C or short sensor.
VI. Electrical connection
Electrical connection includes sensor connection, mains supply, controlled
pump (and electric heaters) according to Figure 2
If necessary, the connecting cables of the sensors can be extended, the length of the
cables does not significantly affect the measurement. The recommended maximum
length that does not affect the measurement is up to 100m.
Terminals 13, 14 are the sensor input from the panels (fireplace, boiler), terminals 15,
16 are sensor input from the boiler. The sensor type is Pt-1000. These types of sensors
are non-polar and the direction of connection is not important.
Terminals 1 and 2 are fed respectively to phase and zero from the mains.
The electrical heaters are connected to terminals 3 and 4.
It should be borne in mind that this is an operational signal.
An additional contactor (shown in Schemes B and D) must be installed to control
the electric heaters.
Connection of standard pump to terminals
5 and 6. Phase exits on terminal 5
respectively and at terminal 6 - zero.
Terminals 7 and 8 must be bridged if the
pump is supplied with a voltage of ~ 220V.
Special (high-efficiency pumps):
- Pumps operated with 0-10V signal, to
terminals 9/+/ and 10/-/;
- PWM controlled pumps to terminals 11/+/
and 12/-/.
The relay output - terminals 5 and 6 can be
used to supply the high-efficiency pumps.
At 0% for PWM and 0V for DCV, the pump
is powered through terminals 5 and 6 for
10 minutes. After this time, the voltage is
removed.
Caution: In order to remove the static electricity stored in solar panels, it
is imperative that they and the metal structure be earthed. Otherwise there is a
risk of damage to the sensors as well as to the controller itself.
Fig.2

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VII. Exemplary hydraulic connection diagrams
A) Heating the boiler only from solar panels
B) Heating of the solar panel water heater and electric heaters
RT - working thermostat of the boiler
BT - blocking thermostat of the boiler

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C) Heating of the boiler only by the fireplace and magnet valve "open" - "close"
for the boiler
D) Heating of the boiler by the fireplace and electric heaters
RT - working thermostat of the boiler
BT - blocking thermostat of the boiler

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8. Technical data
Power supply ~ 230V (+/- 10%) / 50-60Hz
Switching current 3A / ~ 250V / 50-60Hz
Number of output contacts two relay
Output signal PWM frequency 1 kHz level 10V (20mA)
Output DCV signal 0 - 10V (20mA) 10% tolerance
Differential temperature 2 ° - 20 ° C
Sensors: Pt1000 (-50 ° to + 250 ° C)
Current through the sensor 1mA
Measuring range -30 ° to + 140 ° C
The display is 128 x 64 pixel graphic
Unit of measurement 1 ° C
Environmental temperature 5 ° - 35 ° C
Environmental Humidity 0 - 80%
Degree of protection IP 20
Temperature / resistance ratio of Pt1000 sensors
°C 0 10 20 30 40 50 60 70 80 90 100
Ω1000 1039 1077 1116 1155 1193 1232 1270 1308 1347 1385
VIII. 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.