LEVTECH LSP-SC2 User manual

SOLAR CONTROL
LSP-SC2
User manual

Short description
Features
Ÿ Temperature measurement with Pt1000 sensors
ŸHeat resistant silicon sensor cables
Ÿ Sound alarm
Ÿ Wall mountable case
Ÿ Easy configuration
Ÿ Manually contrallable
Ÿ Algorithm preventing the pump from sticking
Ÿ Displaying of measured temperatures
The LSP-SC2 is designed to control a
solar collector system consisting of a solar
collector and a hot water storage tank. By
comparing the temperatures of the solar
collector and the storage tank, the unit controls
the pump and assures the user that the system
is operating safely and efficiently. Simplicity and
c o s t e ff e c t i v e n e s s w e r e t h e m a i n
considerations in its design.
T2 T1
Pow er ON
Pump O N
Err or
SOLAR CONTROL
START
TEMP
TEMP
DIFF
OFF TI ME
WATER TANK
TEMP
COLLECTOR
TEMP
Levtech Service & Prodtuction SRL

Description
Button for turning off
the sound alarm and
for testing the pump
5A fuse for
the pump
500mA fuse
for the
power
supply
Display
LED
indications
Pt1000
sensor from
the collector
Pt1000
sensor from
the water
tank
Levtech Service & Prodtuction SRL
Pump off delay
potentiometer
(0-20 sec).
Temperature
difference
potentiometer
(2-22°C).
Start temp
potentiometer
(0-40°C)
Jumper
Holiday switch

Description
You can easily change the settings, but it is recommended to seek the
advice of a professional. Our controller is equipped with potentiometers, a
switch, a button and a jumper. To change the position of the jumper, the back
cover must be removed. It has two temperature sensor inputs. Both sensors are
Pt1000, one measuring the temperature in the collector and the other in the water
tank. There is one output on the controller which operates the circulating pump.
On this output appears the input supply voltage, which can be 150V - 240V AC.
The maximum current drawn by the pump is 5A.
Display
When changing potentiometers, the display automatically shows the value
of the changing potentiometer.
Otherwise, it shows the tank temperature for 3 seconds and the solar
collector temperature for 10 seconds. A dot is displayed to distinguish between
the two values.
Temperature of the
water tank
(Dot)
Temperature of the
collector
(No dot)
Levtech Service & Prodtuction SRL
Potentionmeters
Ÿ With the OFF TIME potentiometer, you can set how long the pump will run
after the temperatures have equalised. This can be useful to prevent the warmer
heat transfer medium from stagnating in the pipes, possibly damaging them. Its
value can be set from 0 to 20 seconds.
Ÿ TEMP DIFF determines the temperature difference at which the controller
should switch. When the solar collector temperature becomes higher than the
tank temperature with this value, the controller will start the pump. Adjustable
from 2 to 22 degrees.
Ÿ The START TEMP potentiometer is used to set the system start
temperature. The collector temperature must be higher than this value for the
pump to start, regardless of the temperature difference between the collector and
the tank. E.g.: solar collector = 38, tank = 30, START TEMP = 40, TEMP DIFF = 6
degrees Celsius. Even if you have the 6 degrees difference, since the collector
temperature has not reached 40 degrees, the pump will not start.

Description
Levtech Service & Prodtuction SRL
Button
The main function of the push button is to start the pump when pressed. As
long as the button is pressed, the pump is active, when it is released it turns off. It
can be operated at any time by pressing the button, regardless of operating
mode, it can also be used to test the operation of the pump.
Another function of the button is to stop the alarm. When pressed, the
sound signal stops, only the light signal remains.
Jumper
In winter, when the outside temperature (solar collector) falls below a
certain value, the pump starts to avoid freezing. The jumper allows you to select
whether the system is or is not filled with antifreeze. When antifreeze mode is
selected, the controller will start the pump at -20 degrees Celsius and stop it when
it goes above -15. If antifreeze mode is selected, the control will start at 3 degrees
Celsius and stop if it exceeds 5 degrees, preventing possible freezing of the
water.
Holiday mode
Holiday mode can be activated by moving the switch at the bottom of the
controller to the ON position. When activated, it ensures that the system remains
at a specific temperature where it has no chance of overheating when not in use.
The controller achieves this by operating the pump at night when the water in the
tank is above 40 degrees Celsius but the water in the collector is below 40
degrees Celsius. The pump is operated by the controller until the water in the tank
falls below 40 degrees Celsius.
Without
antifreeze
With
antifreeze

Alarms
If any sensor wire is broken, the buzzer will sound and the pump will start
until the controller receives a readable value from the sensor again. The sound
signal can be turned off by pressing of the Button on the bottom of the controller.
After the beep stops, the pump continues to operate until the problem is resolved.
The display indicates which sensor has a problem and what the error is.
These can also appear in combination.
EO-- the sensor of the water tank is not connected or broken (open loop)
ES-- the sensor of the water tank is shorted
E--O the sensor of the collector is not connected or broken(open loop)
E --S the sensor of the collector is shorted
Sensor failure alarm
Overheat alarm
This alarm is triggered when the water temperature in the solar collector
reaches 115°C. The pump will start, the red Error LED will light up and an
audible alarm will sound. The beep can be stopped by pressing the button on
the bottom of the unit. If the temperature falls below 105°C, the beep will
automatically stop, but the light will remain on and the pump will continue to
run. If the temperature drops below 100°C, the alarm stops and the controller
returns to normal operation.
Low temperature alert
If the antifreeze mode is not active, i.e. the system is filled with antifreeze,
when the collector temperature reaches -20°C, the pump will start and the Error
LED will be active. The pump will continue to run until the temperature rises to -
15°C. At that point the light will also stop.
If the jumper is in antifreeze mode and the solar collector temperature drops
below 4°C, the pump and the Error LED will start and run until the temperature
exceeds 5°C.
Levtech Service & Prodtuction SRL

Operation
In normal operating mode, the controller measures the temperature in the solar collector
(T1) and the water tank (T2). If the temperature difference between the solar collector and the
water tank becomes greater than the preset value, the pump will start and run until the
temperature of the collector (T1) drops by half of the preset value.
For example: preset difference = 10 degrees Celsius
T2 = 50 degrees Celsius
When T1 reaches 60 degrees Celsius, the controller starts the pump and runs it until the solar
collector temperature T1 drops to 55 degrees Celsius (50 + (10 / 2)). During this time, the
temperature of the water tank (T2) should increase
Normal mode
Pump protection
If the pump has not been in operation for 8 days, the controller will start it and run it
for 3 minutes.
This mode can be used to keep the tank temperature at 50 degrees Celsius. It does
this so that when the temperature of the solar collector drops below 18 degrees Celsius
during the night, the controller starts the pump and runs until the temperature of the tank
drops below 50 degrees Celsius.
Holiday mode
T2 T1
Power O N
Pump ON
Error
SOLAR CONTROL
START
TEM P
TEM P
DIF F
OFF T IME
WATER TANK
TEMP
COLLECTOR
TEMP
Levtech Service & Prodtuction SRL

Dimensions
38 mm
96,5 mm
70 mm
147 mm 135 mm
Levtech Service & Prodtuction SRL

Connectors
Pt1000 sensor
from the water
tank
Pt1000 sensor
from the solar
collector
Pump
connector
(Max 5A/220V)
Power
supply150-
240V AC
By default, the two temperature sensors and the power cable are
connected to the controller. Before use, it is only necessary to connect the
motor wires properly. If the wires of one of the sensors need to be extended, it
is justified to dismantle, splice and reassemble them. The sensors can be
extended to a length of up to 300 m without affecting the accuracy of the
measurement.
The polarity of the Pt1000 sensors does not matter, their conductors are
interchangeable.
A 3-polarity connector is available for connecting the pump. This means that a
three-conductor pump can be connected using protective earth (G), neutral (N)
and phase (M).
The power supply is also connected based on the picture. Based on the image,
the phase (L) is at the bottom, neutral (N) is above it, and the protective ground
(G) is above it.
GND
N
L
GND
N
L
Levtech Service & Prodtuction SRL

Technical data
Power supply
150 - 240V AC 50Hz
Consumption
1W
Controller operating temperature
-20 °C to 60 °C
Dimensions (H x L x W)
147 x 96 x 38 mm
Weight
185g (460g with accessories)
Display
3-character 7-segment display
The pump max. current consumption
5A
Type of sensors
Pt1000 / Pt1000
Sensor wire length
3m / 3m
Measuring range
-50 °C to 180 °C
Temperature setting accuracy
+/- 0.5 °C
Levtech Service & Prodtuction SRL

Default settings
Levtech Service & Prodtuction SRL
Jumper
Without antifreeze
Holiday switch
OFF
High temperature alarm with sound
115 °C in collector
High temperature alarm without sound
105 °C in collector
Antifreeze mode
Pump starts at -20 °C and stops at
-15 °C
Without antifreeze mode
Pump starts at 4°C and stops at 5 °C
Pump off delay potentiometer
5 sec
Temperature difference potentiometer
6°C
Start temperature potentiometer
30°C

Attention!
Before starting work on the controller (cable
connection, equipment installation, etc.), make
sure the equipment is disconnected from the
main power source. All connections must be
made personally by a qualified electrician. Before
switching on the controller, check the correct
connection of the cables and inspect the
insulation of the wires!
The device may be damaged if struck by a
lightning.
Make sure the plug is disconnected from
the power supply during storm.
We are committed to protecting the environment.
The manufacture of electronic devices imposes
an obligation to ensure the safe disposal of
components and electronic devices used for
environmental safety. Recycling waste helps
protect the environment. The user is obliged to
transfer used equipment to a collection point,
where all electrical and electronic components will
be recycled.
Levtech Service & Prodtuction SRL

SOLAR CONTROL
INSTALLATION GUIDE
Remove the back of the device
by removing the 4 screws on it.
Once you have assembled the
configuration shown in the image,
follow the configuration instructions
on the next page.
230 AC
T2
T2
T1
T1
1
3
2
4
5
6
Insert the pre-wired temperature
sensor (Internal Sensor) into the
measuring port of the water tank.
If necessary, extend it up to 300m.
Insert the connected sensor into
the measuring socket of the
s o l a r c o l l e c t o r ( E x t e r n a l
Sensor). If necessary, extend
the sensor cable up to 300m.
Connect the pump to the
controller. Caution, the input
supply voltage can appear on
the connector! Do not connect
the device to mains voltage
during installation.
Plug the power cord of the
device into an AC outlet.
Check that the appliance is
working, the Power ON LED
should be lit.
T2 T1
Powe r ON
Pump ON
Erro r
SOLAR CONTROL
START
TEMP
TEMP
DIFF
OFF TIM E
WATER TANK
TEMP
COLLECTOR
TEMP

SOLAR CONTROL
CONFIGURATION INSTRUCTIONS
OFF
ON
1
3
2
5
6
Position the jumper according to your
system. If not filled with antifreeze, leave
it in the ON position. If it is filled with
antifreeze, move it to the OFF position.
Use a screwdriver to set the minimum
temperature from which the controller
should operate. You can do this by using
the potentiometer on the right.
It is set to 30°C by default.
Adjust the temperature difference
between the solar collector and the tank
using the central potentiometer.
By default, this value is 6°C.
Test the pump by pressing the
indicated button .
Reinstall the back cover.
4The third potentiometer on the left
can be used to delay the pump's stop.
This is factory set to 5 seconds.