Regulus SRS2 TE Operating instructions

REGULUS SRS2 TE Solar Controller
EN
v. 1.3
Installation, Wiring and Operating Instructions

CONTENTS
A.1 EC Declaration of Conformity 4
A.2 General information 4
A.3 Explanation of symbols 4
A.4 Changes to the unit 5
B.1 Specification 6
B.2 Temperature resistance table for
Pt1000 sensors 6
B.3 Description 7
B.4 Scope of supply 7
B.5 Disposal 7
B.6 Hydraulic variants 8
C.1 Wall installation 9
C.2 Electrical wiring 10
C.3 Installing the temperature sensors 11
D.1 Terminal block wiring 12
D.2 Example of el. heating element wiring 13
E.1 Display and input 14
E.2 Commissioning help 15
E.3 Free commissioning 15
E.4 Menu sequence and menu structure 16
1. - Measurements 17
2. - Statistics 18
2.1. - Operating hours 18
2.2. - Heat quantity 18
2.3. - Graphic overview 18
2.4. - Error log 18
2.5. - Reset / Clear 18
3. - Operating modes 19
3.1. - Auto 19
3.2. - Manual 19
3.3. - OFF 19
4. - Settings 20
4.1. - Tmin S(X) 20
4.4. - ΔT Solar S(X) 20
4.5. - Tmax S(X) 21
4.14. - Auxiliary heat source 22
4.14.1. - TH Set 22
4.14.2. - Hysteresis 22
4.14.3. - Aux. heat source sensor 1 22
4.14.4. - Aux. heat source sensor 2 22
4.14.5. - T eco 22
4.14.6. - Energy saving mode 22
4.14.7. - Periods 23
4.15. - Recirculation 23
4.15.1. - Min. set temperature 23
4.15.2. - Hysteresis 23
4.15.7. - Recirculation time programs 23
5. - Protective functions 24
5.1. - Anti Legionella 24
5.2. - System protection 25
5.3. - Collector protection 25
5.4. - Recooling 25
5.5. - Frost protection 26
5.6. - Seizing protection 26
5.7. - Collector alarm 26
6. - Special functions 27
6.1. - Program selections 27
6.2. - Pump settings V1 27
6.2.1. - Type of pump 27
6.2.2. - Pump 27
6.2.3. - Output Signal 28
6.2.4. - PWM Off / 0-10V Off 28
6.2.5. - PWM On / 0-10V On 28
6.2.6. - PWM Max/ 0-10V Max 28
6.2.7. - Show signal 28
6.3. - Speed control R1 29
6.3.1. - Modes R1 29
6.3.2. - Purging time 29
6.3.3. - Sweep time 29
6.3.4. - Max. speed 30
6.3.5. - Min. speed 30
6.3.6. - Setpoint 30
6.3.7. - Temperature difference 30
6.7. - Heat quantity 30
6.7.1. - Heat metering 30
6.7.5. - Antifreeze type 30
6.7.6. - Glycol percentage 31
6.7.7. - Flow r ate 31
6.7.9. - ΔT Offset 31
6.8. - Sensor calibration 31
6.9. - Commissioning 31
6.10. - Factory settings 31
6.11. - Start aid function 32
6.12. - Time and date 32
6.13. - Daylight saving time 32
6.14. - Sleep mode 32
6.15. - Temperature unit 32
7. - Menu lock 33
8. - Service values 34
9. - Language 35
Z.1 Malfunctions with error messages 36
Z.2 Replacing the fuse 37
Z.3 Maintenance 37
Useful hints and tricks 38

3
SRS2 TE
2 output mechanical relays 460 W
1 output mechanical relays 3.5 kW
3 inputs for Pt1000 temperature sensors
This Instruction Manual applies to the following hardware version:

4
Safety Instructions
The manufacturer declares that the SRS2 TE Solar Controller is marked with the CE
mark and conforms to the following relevant safety regulations:
- Directive 2014/35/EU-EUlow voltage directive
- Directive 2014/30/EU- EUelectromagnetic compatibility directive
A.1 EC Declaration of Conformity
These installation and operating instructions contain basic instructions and important
information regarding safety, installation, commissioning, maintenance and the optimal
use of the unit. Therefore these instructions must be read completely and understood
by the installation technician/specialist and by the system user before installing,
commissioning and operating the unit. The installation shall be done in compliance
with valid standards and rules. The controller does not under any circumstances
replace any safety devices (e.g. safety valve, air vent valve etc.) to be installed into
a solar circuit! Installation of the unit may only be carried out by a specialist who is
trained on the required level.
For the user: Make sure that the specialist gives you detailed information on the
function and operation of the controller. Always keep these instructions in the vicinity
of the controller. Any changes to the controller or tampering with may pose a risk to
safe operation of the appliance and to the complete solar thermal system..
A.2 General information
Danger
Caution
A.3 Explanation of symbols
Failure to observe these instructions can result in danger to life from
electric voltage.
Danger
Failure to observe these instructions can result in serious damage to
health such as scalding, or even life-threatening injuries.
Warning
Failure to observe these instructions can result in destruction of the unit
or the system, or damage to the environment.
Information especially important for the function and optimal use of the
unit and the system.
- please read carefully!

5
Safety Instructions
A.4 Changes to the unit
• Changes, additions to or conversion of the unit are not permitted without a written
permission from the Manufacturer.
• It is forbidden to install any additional components into the controller that has not
been tested together with the controller.
• The controller shall not be used after an accident when its functions may have been
affected – e.g. after a fire. The controller shall be switched off immediately.
• Use original spare parts only.
• Marking of the Manufacturer and Distributor shall not be altered or removed.
• All adjustments shall be done in compliance with this Guide.

6
B.1 Specification
°C 0 102030405060708090100
Ω1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
Description
Electric specification::
Voltage 100 - 240 VAC +/- 10%
Mains frequency 50 - 60 Hz
Power consumption 0,5W - 2,5 W
Internal fuse T2 A / 250 V slow blow
IP rating IP40
El. protection class II
Overvoltage category II
Pollution degree II
SRS2 TE
Mechanical relay, 460 VA (AC1), 460 W (AC3) 2 (R1, R2)
Mechanical relay, 3500 VA (AC2), 3500 W (AC3) 1(R3)
Pt1000 sensors, from -40 °C to +300 °C 3
Permissible cable length of sensors and accessories:
Collector sensor <30 m
other Pt1000 sensors <10 m
Mechanical relay <10 m
Clock backup period 24 h
Permissible ambient conditions:
Ambient temperature:
for controller operation 0°C...40 °C
for transport/storage 0°C...60 °C
Air humidity:
for controller operation max. 85% rel. humidity at 25 °C
for transport/storage no moisture condensation permitted
Other specifications and dimensions:
Housing design 2-part, ABS plastic
Installation methods wall installation, optionally panel installation
Overall dimensions 163 mm x 110 mm x 52 mm
Installation aperture dimensions 157 mm x 106 mm x 31 mm
Display fully graphic display, 128 x 64
LED multicolour
Operation 4 entry keys
Temperature sensors:
B.2 Temperature resistance table for Pt1000 sensors:

7
SRS2 TE Controller is designed for automatic control of solar thermal systems. The
SRS2 TE model is intended to control solar thermal systems with one solar array and
one solar consumer. The solar consumer can be a hot water storage tank, a heat ex-
changer for a swimming pool, and a thermal store for heating. All hydraulic variants are
described in Chapter 2.
- both graphics and texts on a backlit display
- simple viewing of the current measurement values
- analysis and monitoring of the system also by means of statistical graphics
- extensive setting menus with explanations
- menu lock can be activated to prevent unintentional setting changes
- usual preset parameters in factory setting
B.3 Description
Description
- SRS2 TE Controller
- 3 screws 3.5 × 35 mm and 3 dowels 6 mm diam. for wall installation
- 12 strain relief clips with 24 screws
- replacement fuse T2A/250V
- 3 Pt1000 temperature sensors
B.4 Scope of supply
IMPORTANT INFORMATION ON DISPOSAL IN COMPLIANCE WITH THE EUROPEAN
DIRECTIVE 2002/96/ES
European Directive 2002/96/EC requires that the equi-
pment bearing this symbol on the product and/or its
packaging must not be disposed of with unsorted munici-
pal waste. The symbol indicates that this product should
be disposed of separately from regular household waste
streams. It is your responsibility to dispose of this and
other electric and electronic equipment via designated
collection facilities appointed by the government or local
authorities. Correct disposal and recycling will help pre-
vent potential negative consequences to the environment
and human health. For more detailed information about
the disposal of your old equipment, please contact your
local authorities, waste disposal service, or the shop where you purchased the product.
WEEE registration number: 02771/07-ECZ
B.5 Disposal

8
Description
B.6 Hydraulic variants
1. Solar with hot water storage tank
2. Solar with hot water storage tank and el. heating element
3. Solar with hot water storage tank and gas boiler
4. Solar with hot water storage tank and heat pump
5. Solar with hot water storage tank w. recirculation
6. Solar with hot water storage tank w. recirculation and el. heating el.
7. Solar with hot water storage tank w. recirculation and gas boiler
8. Solar with hot water storage tank w. recirculation and heat pump
1. Solar with hot water storage tank 2. Solar with hot water storage tank
and el. heating element
3. Solar with hot water storage tank
and gas boiler
4. Solar with hot water storage tank
and heat pump
8. Solar with hot water storage tank
w. recirculation and heat pump
7. Solar with hot water storage tank
w. recirculation and gas boiler
6. Solar with hot water storage tank
w. recirculation and el. heating el.
5. Solar with hot water storage tank
w. recirculation
For hydraulic variants 6, 7 or 8, an extra Pt1000 temperature sensor is needed.

9
C.1.1
C.1.2
Warning
C.1 Wall installation
Install the controller in dry areas only.
Installation instructions::
1. Unscrew cover screw completely.
2. Carefully pull the upper part of the hou-
sing from the lower part.
3. Set the upper part of the housing aside,
being sure not to touch the electronics
when doing so.
4. Hold the lower part of the housing up
to the selected position and mark the 3
mounting holes. Make sure that the wall
surface is as even as possible so that the
housing does not become distorted when
it is screwed on.
5. Mark the position on the wall with a
pencil. Using a drill and size 6 bit, drill 3
holes at the points marked on the wall and
push in the plugs.
Fig. C.1.2.
6. Insert the upper screw and screw it in
slightly.
7. Fit the upper part of the housing and
insert the other two screws.
8. Align the housing and tighten the three
screws.
Installation

10
Installation
C.2 Electrical wiring
Danger
Before working on the unit, switch off the power supply and secure
it against being switched on again! Check for the absence of power!
Electric wiring may only be done by a specialist in compliance with valid
rules. Do not use the controller if its case shows visible damage.
Low-voltage cables such as temperature sensor cables must be routed
separately from mains voltage cables. Feed temperature sensor cables
only into the left-hand side of the unit, and mains voltage and relay
cables only into the right-hand side.
The controller is not equipped with a mains switch. For this purpose
please use e.g. a circuit breaker.
The cables being connected to the unit must not be stripped by more
than 55 mm, and the cable jacket must reach into the housing just to the
other side of the strain relief.
Controller and VFS flowmeter have to have the same ground potential.
The VFS flowmeter uses a functional earth connector (PELV). For this
reason, the PE-connector of the controller has to be connected to the
pipe system near the flowmeter.
Caution
Warning
Warning
Warning

11
C 2. 1 Wiring instructions:
1. Select the necessary hydraulic variant
(B.6).
2. Open the controller as described in C.1
3. Strip the cable by 55 mm max., insert
and fit the cable strain relief. Strip the last
8-9 mm of all the wires (Fig. C.2.1)
4. Open the terminals using a flat
screwdriver (Fig. C.2.1.) and wire the leads
following the diagram.
5. Refit the upper housing part and fasten
with screw.
6. Switch on mains voltage and place cont-
roller in operation.
C.2.1
Installation
C.3 Installing the temperature sensors
The temperature sensor cables must be routed separately from mains voltage
cables.
The controller operates with Pt1000 temperature sensors.
Max. sensor lead length for S1 sensor is 30 m and its cross section at least
0.75 mm2. Max. sensor lead length for S2 and S3 is 10 m and its cross section
at least 0.75 mm2. Make sure there is no contact resistance in the wiring!
Select the proper location for the sensor where it feels the right temperature.
Use only immersion sensors. Pipe-mounted sensors only in exceptional
cases.
Make sure that the terminals of extension cables and sensors are properly
tightened. Use only immersion or pipe-mounted sensors.
Caution
Warning
The VFS flowmeter shall be connected via a terminal. It is highly
recommended to connect the VFS flowmeter to the solar return – this will
prevent damage by a too high temperature. Check the flow direction.
Caution

12
Installation
D.1 - Terminal block wiring
Extra low voltage max. 12 V
Terminal: connection for:
S1 sensor 1
S2 sensor 2
S3 sensor 3
S4 sensor 4
V1 output 0-10V / PWM
for high-efficiency pumps
Mains voltage 230 V 50 Hz
Terminal: connection for:
N neutral N
R1 relay 1
N Mains neutral N
L Mains phase L
N neutral N
R2 relay 2<
R3l relay 3l
R3 relay 3
PE protective conductor
(green-yellow)
S3V1
S3 S2 S2 S1 S1 R2 R1LNNN
R3R3
S4 S4
CAN CAN
Extra low voltage
max. 12 V
Warning
Mains voltage
230 V
Danger
*Sensor No. 4 is not included in supply!
*

13
D.2 Example of el. heating element wiring
Installation
L - mains phase
N - mains neutral
PE - protective
conductor
el. heating element
Controller
SRS2 TE
sensor 4 mains voltage
230 V

14
Examples of display symbols:
pump (rotates in operation)
valve (direction of flow black)
collector
hot water storage tank
swimming pool
temperature sensor
heat exchanger
load pause
warning/error message
new information available
logging is active
(1)
(2)
(3)
(4)
The display (1) shows graphic and text
info on the hydraulic variant, set and
measured values and other text info.
LED lamp (2):
lights up green - if a relay is closed and
the controller works right
lights up red - if the controller is set to
automatic operation and all relays are
open
flashes slowly red - if manual operation
mode is set
flashes quickly red - if an error occurred
Entries are made using four keys (3+4),
which are assigned to different functions
depending on the situation.
The ”esc” key (3) is used to cancel an
entry or to exit a menu.
If applicable there will be a request for
confirmation as to whether the changes
which have been made should be saved.
The function of each of the other three
keys (4) is shown in the display line
directly above the keys; the right-hand key
generally has a selection and confirmation
function.
Examples of key functions:
+/- = increase/decrease values
▼/▲= scroll menu down/up
YES/NO = approve/reject
Info = additional information
Back = to previous screen
ok = confirm selection
Confirm = confirm setting
Operation
E.1 Display and input

15
E.2 Commissioning help
E.3 Free commissioning
If you decide not to use the commissioning help, you should make the necessary
settings in the following sequence:
- Menu 9. Language (page 35)
- Menu 6.12 Time and date (page 32)
- Menu 6.1 Program selection (page 27)
- Menu 4. Settings, all values (page 20)
- Menu 5. Protective functions if modifications are necessary (page 24)
- Menu 6. Special functions if additional changes are necessary (page 27)
Finally, menu 3.2 under operating mode “Manual“ should be used to test the switch
outputs with the consumers connected, and to check the sensor values for plausibility.
Then switch on automatic mode.
ons of each parameter in the display.
Pressing the “esc” key takes you back to the previous value so you can look at the
selected setting again or adjust it if desired. Pressing the “esc“ more than once takes
you back step by step to the selection mode, thus cancelling the setup wizard. Finally,
menu 3.2 under operating mode “Manual” should be used to test the switch outputs
with the consumers connected, and to check the sensor values for plausibility. Then
switch on automatic mode.
The first time the controller is turned on,
language and clock need to be set.
After that a query appears as to whether
you want to parameterize the controller
using the Setup Wizard or not. The setup
wizard can also be terminated or called up
again at any time in the special functions
menu. The setup wizard guides you throu-
gh the necessary basic settings in the
correct order, and provides brief descripti-
Operation
Caution
Observe the explanations for the individual parameters on the following
pages, and check whether further settings are necessary for your
application.

16
E.4 Menu structure
The graphics or overview mode appears
when no key has been pressed for
2 minutes, or when the main menu is
exited by pressing “esc“.
Pressing any key (4) in graphics or
overview mode takes you directly to the
main menu. The following menu items are
then available for selection there:
Current temperature values with
explanations
Function control of the system with
operating hours etc.
Automatic mode, manual mode or switch
unit off
Set parameters needed for normal
operation
Solar and frost protection, recooling...
Commissioning help, program selection,
sensor calibration, clock etc.
Menu lock against unintentional setting
changes
Diagnosis in the event of an error
Language selection
Operation
1. Measurements
2. Statistics
3. Operating mode
4. Settings
5. Protections
6. Special functions
7. Menu lock
8. Service Data
9. Language

17
Caution
Menu “1. Measurements” serves to dis-
play the currently measured temperatures.
What measurement values are displayed
depends on the selected program and the
specific controller model.
The menu is closed by pressing “esc” or
selecting “Exit measurements”.
If “--” appears on the display instead of the measurement value,
then there may be a defective temperature sensor or its wiring. If the
cables are too long or the sensors are not placed optimally, the result
may be small deviations in the measurement values. In this case the
display values can be compensated for using the function of sensor
compensation - see Chapter 6.8.
Which sensors are displayed will depend on the program selected,
sensors connected and settings.
Measurement values
1. - Measurements

18
2. - Statistics
Caution
Menu “2. Statistics” is used for function
control and long-term monitoring of the
system.
The menu is closed by pressing “esc” or
selecting “Exit statistics”.
For analysis of the system data it is essential that time is set accurately
on the controller. Please note that the clock does not continue to run if
the mains voltage is interrupted, and must therefore be reset. Incorrect
time set in the controller may result in data being deleted, recorded
incorrectly or overwritten.
Statistics
2.1. - Operating hours
Display of operating hours of the solar pump connected to the controller; various time
spans are available (last day, week, month, year).
2.2. - Heat quantity
Display of the approximate heat output of the solar thermal system.
2.3. - Graphic overview
This function provides a clearly-organized display of operating hours, average ΔT and
heat output as a bar graph. Various time ranges are available. The two left-hand keys
can be used to page through the data.
2.4. - Error log
Resetting and deleting the individual analyses. The function “All statistics” clears all
analyses but not the error messages.
2.5. - Reset / Clear
Display of the last 20 events occurring in the system with indication of date and time.

19
3. - Operating modes
In menu “3. Operating modes” the cont-
roller can either be switched to automatic
mode, turned off, or placed in a manual
operating mode.
The menu is closed by pressing “esc” or
selecting “Exit operating mode”.
Automatic mode is the normal operating mode of the controller.
Only automatic mode provides proper controller function taking into account the
current temperatures and the parameters that have been set!
3.1. - Automatic
Operating modes
3.2. - Manual
The relay and thus the connected pump, valve or heating rod are switched on and
off manually by pressing a key, with no regard to the current temperatures and the
parameters which have been set. The measured temperatures are also shown.
3.3. - Off
When the operating mode “Off” is activated, all controller functions are
switched off. This can lead, for example, to overheating of the solar
collector or other system components. The measured temperatures are
displayed even when the controller is Off.
Warning
Danger
The manual mode is intended to be used by a technician when
commissioning or checking the system. Activating manual mode in
current operation can lead to system damage or overheating of water in
the hot water storage tank!
Never select other mode than automatic without a reason. Long-term operation in
manual mode may lead to collector or storage tank overheating and limiting the lifetime
of solar fluid and other solar thermal components!

20
4. - Settings
The system parameters are set in menu “4.
Settings”.
4.1. - Tmin S(X)
Sensor S(X) switch-on temperature
If the temperature at sensor S(X) exceeds the value of TminS(X) and the other con-
ditions are also met, then the controller switches on the associated pump and/or valve.
If the temperature at the sensor S (X) drops below the value of TminS(X) by 5 °C, then
the pump and/or the valve are switched off again.
Setting range: 0-99 °C /Default setting: 20 °C
The menu is closed by pressing “esc” or
selecting “Exit settings”.
Settings
3.4. - Tmax S2
Switch-on/switch-off temperature difference for sensor (X)
If this temperature difference between the reference sensors is exceeded and the
other conditions are also met, then the controller switches on the applicable relay.
When the temperature drops by ΔT Off, then the relay is switched off again.
Setting range: ΔT: 4 - 50 °C / ΔT off: 2 - 49 °C / Default setting: depends on the hydrau-
lic variant
Setting the temperature difference too small may lead to a situation
when the heat source will not be able to heat up the solar consumer to
the value when the pump is switched off (ΔT of source – ΔT off). Then
the pump will run continuously. Setting the temperature difference too
big may lead to switching the circulation pump on and off permanently.
Please refer to special rules described in Chapter 6.3 for switching
pumps with controlled speed.
Caution
4.4. - ΔT Solar S(X)