Thermo Solar SR24 User manual

Read carefully before installation, commissioning and operation
Temperature Difference Controller SR24
Installation and operating instructions

Content
A.1 EC declaration of conformity 4
A.2 General instructions 4
A.3 Explanation of symbols 4
A.4 Changes to the unit 5
A.5 Warranty and liability 5
B.1 Specifications 6
B.2 About the controller 7
B.3 Scope of supply 7
B.4 Disposal and pollutants 7
B.5 Hydraulic variants 8
C.1 Wall installation 9
C.2 Electrical connection 10
C.3 Installing the temperature sensors 11
D. - Terminal connection diagram 12
E.1 Display and input 27
E.2 Commissioning help 28
E.3 Free commissioning 28
E.4 Menu sequence and menu structure 29
1. - Measurement values 30
2. - Statistics 31
2.1. - Operating hours 31
2.2. - Average temperature difference T 31
2.3. - Heat output 31
2.4. - Graphic overview 31
2.5. - Message log 31
2.6. - Reset/clear 31
3. - Display mode 32
3.1. - Schematic 32
3.2. - Overview 32
3.3. - Alternating 32
4. - Operating modes 33
4.1. - Automatic 33
4.2. - Manual 33
4.3. - Off 33
4.4. - Fill system 33
5. - Settings 34
5.1. - Tmin S1 34
5.2. - Tmin S2 34
5.3. - Tmin S3 34
5.4. - Tmax S2 35
5.5. - Tmax S3 35
5.6. - T R1 35
5.7. - T R2 36
5.8. - Tset S3 36
5.9. - Hysteresis 36
5.10. - Priority sensor 37
5.11. - T priority 37
5.12. - Loading time 37
5.13. - Increase 37
5.14. - Thermostat periods 37
5.15. - „Party Function“ 38
5.16. - Energy saving mode 38
5.17. - TecoS3 38
6. - Protective functions 39
6.1. - Seizing protection 39
6.2. - Frost protection 39
6.3. - System protection 40
6.4. - Collector protection 40
6.4.1. - Cooling functions 41
6.5. - Col.- Alarm 41
6.6. - Recooling 41
6.7. - Anti-Legionella 42
7. - Special functions 43
7.1. - Program selections 43
7.2. - Signal V1 43
7.1.1. - Type of pump 43
7.2.1.1. - Pump 43
7.2.1.2. - Output Signal 44
7.2.1.3. - PWM off 44
7.2.1.4. - PWM on 44
7.2.1.5. - PWM Max 44
7.2.1.3 - 0-10V off 44
7.2.1.4 - 0-10V on 44
7.2.1.5 - 0-10V Max 44
7.2.1.6. - Speed when „On“ 45
7. 2.1.7. - Show sig nal 45
7.2.1. - Modes 45
7.2.2. - Purging time 46
7.2.3. - Sweep time 46
7.2.4. - max. speed 46
7.2.5. - min. speed 46
7.2.6. - Setpoint 46
7.3. - Time & date 47
7.4. - Sensor calibration 47
7.5. - Commissioning 47
7.6. - Factory settings 47
7.7. - H eat qua ntit y 48
7.7.1. - He at meter ing 48
7.7. 2 . - AF t y pe 48
7.7.3. - Glycol portion 48
7.7. 4. - Flow rate 48
7.7. 5. - T Offset 48
7.8. - Start aid function 49
8. - Menu lock 50
9. - Service values 51
10. - Language 52
Z.1. Malfunctions with error messages 53
Z.2 Replacing the fuse 54
Z.3 Maintenance 54

3
Version 1
2 mechanical relays on/off
Version 3
2 mechanical relays on/off
1 PWM / 0-10V for high efficency pumps
Version 2
1 mechanical relays on/off
1 electronic relay
Version 4
1 mechanical relay on/off
1 electronic relay
for speed control of standard pumps
1 PWM / 0-10V for high efficency pumps
This manual applies to the following hardware versions:
When you are unsure which version you have, check the type label on the side
of the controller.
If the version is not readable here, open the controller’s “Service values” menu.
The version is shown in the first line of the service values.
M

4
Safety instructions
By affixing the CE mark to the unit the manufacturer declares that the Temperature-
Difference-Controller SR24, conforms to the following relevant safety regulations:
- EC low voltage directive 2006/95/EC
- EC electromagnetic compatibility directive 2004/108/EC
Conformity has been verified and the corresponding documentation and the EC declaration
of conformity are kept on file by the manufacturer.
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 installation, com-
missioning and operation of the unit.
The valid accident prevention regulations, VDE regulations, the regulations of the lo-
cal power utility, the applicable DIN-EN standards and the installation and operating
instruction of the additional system components must also be observed. The controller
does not under any circumstances replace any safety devices to be provided by the
customer!
Installation, electrical connection, commissioning and maintenance of the unit may
only be carried out by specialists who possess the appropriate training.
For the user: Make sure that the specialist gives you detailed information on the func-
tion and operation of the controller. Always keep these instructions in the vicinity of the
controller.
A.2 General instructions
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.
Caution
Failure to observe these instructions can result in destruction of the unit
or the system, or damage to the environment.
Information which is especially important for the function and optimal
use of the unit and the system.
It is essential that you read this!

5
Safety instructions
A.4 Changes to the unit
The controller has been manufactured and tested with regard to high quality and
safety requirements. The unit is subject to the statutory guarantee period of two years
from the date of sale.
The warranty and liability shall not include, however, any injury to persons or material
damage that is attributable to one or more of the following causes:
- Failure to observe these installation and operating instructions
- Improper installation, commissioning, maintenance and operation
- Improperly executed repairs
- Unauthorised structural changes to the unit
- Installation of additional components that have not been tested
together with the unit
- Any damage resulting from continued use of the unit despite an
obvious defect
- Failure to use original spare parts and accessories
- Use of the device for other than its intended purpose
- Operation above or below the limit values listed in the
specifications
- Force majeure
A.5 Warranty and liability
- Changes, additions to or conversion of the unit are not permitted without the writ-
ten permission from the manufacturer
- It is likewise forbidden to install additional components that have not been tested
together with the unit
- If it becomes clear that safe operation of the unit is no longer possible, for exam-
ple because of damage to the housing, then turn the controller off immediately
- Any parts of the unit or accessories that are not in perfect condition must be
exchanged immediately
- Use only original spare parts and accessories from the manufacturer.
- Markings made on the unit at the factory must not be altered, removed or made
illegible
- Only the settings actually described in these instructions may be made on the
controller
Changes to the unit can compromise the safety and function of the unit
or the entire system.
Danger

6
B.1 Specifications
°C 0 102030405060708090100
1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
Description of controller
Electrical specifications:
Mains voltage 115VAC +/- 10%
Mains frequency 50 - 60Hz
Power consumption 1,5W - 2,3W
Internal fuse T2A / 250V slow blow
Protection category IP40
Protection class II
Overvoltage Category II
Degree of Pollution Category II
Vers.1 Vers.2 Vers.3 Vers.4
mechanical relay 460VA for AC1 / 460W for AC3 2 (R1-R2) 1 (R2) 2 (R1 - R2) 1 (R2)
electronic relay min.5W...max.120W for AC3 - 1 (R1) - 1(R1)
0-10V output, tolerance 10%, 10 k load or
PWM output freq. 1 kHz, level 10 V --11
PT1000 sensor input measuring range -40°C to
300°C 3333
Permissible cable length of sensors and appliances:
Collector and outdoor sensor <30m
other PT1000 sensors <10m
PWM / 0...10V <3m
electronic relay <3m
mechanichal relay <10m
Real Time Clock RTC with 24 hour power reserve
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 3-part, ABS plastic
Installation methods Wall installation, optionally panel installation
Overall dimensions 163mm x 110mm x 52mm
Aperture installation
dimensions 157mm x 106mm x 31mm
Display Fully graphical display, 128 x 128 dots
Light diode Multicolor red/green
Operation 4 entry keys

7
The Temperature Difference Controller SR24 facilitates efficient use and function
control of your solar or heating system. The device is impressive most of all for its
functionality and simple, almost self-explanatory operation. For each step in the input
process the individual entry keys are assigned to appropriate functions and explained.
The controller menu contains headwords for the measured values and settings, as well
as help texts or clearly-structured graphics.
The SR24 can be used as a temperature difference controller for the various system
variants illustrated and explained under B.5.
Important characteristics of the SR24:
- Depiction of graphics and texts in a lighted display
- Simple viewing of the current measurement values
- Analysis and monitoring of the system by means of statistical graphics,etc.
- Extensive setting menus with explanations
- Menu block can be activated to prevent unintentional setting changes
- Resetting to factory settings
- A wide range of additional functions are available.
B.2 About the controller
Description of controller
- Temperature Difference Controller SR24
- 3 screws 3,5x35mm and 3 plugs 6mm for wall installation
- 6 strain relief clips with 12 screws, replacement fuse 2A slow-blow
- Installation and operating instructions SR24
Optionally contained depending on design/order:
- 2-3 PT1000 temperature sensors and immersion sleeves
Additionally available:
- Pt1000 temperature sensor, immersion sleeves, overvoltage protection,
- Various additional functions by means of supplementary circuit boards
B.3 Scope of supply
B.4 Disposal and pollutants
The unit conforms to the European RoHS directive 2002/95/EC for the restriction of
the use of certain hazardous substances in electrical and electronic equipment.
Caution
The unit must not under any circumstances be disposed of with ordinary
household refuse. Dispose of the unit only at appropriate collection
points or ship it back to the seller or manufacturer.

8
Description of controller
B.5 Hydraulic variants
Caution
The following illustrations should be viewed only as schematic diagrams showing
the respective hydraulic systems, and do not claim to be complete. The controller
does not replace safety devices under any circumstances. Depending on the
specific application, additional system components and safety components may be
mandatory, such as check valves, non-return valves, safety temperature limiters,
scalding protectors, etc., and must therefore be provided.
1
10
13 14
11 12
17
15 16
18 19 20
26 27 (2xT-Regler)
2xT
28 (2xThermostat
2xT
23 24
25
21 22
2 3 4
56 7 8
9

9
C.1.1
C.1.2
Caution
C.1 Wall installation
Install the controller only in dry areas and under the ambient conditions de-
scribed under B.1 “Specifications”. Carry out the following steps 1-8.
1. Unscrew cover screw completely
2. Carefully pull upper part of housing
from lower part.
3. Set upper part of 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. Using a drill and size 6 bit, drill 3 holes
at the points marked on the wall and push
in the plugs.
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 connection
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!
Electrical connections may only be made by a specialist and in compli-
ance with the applicable regulations.
Do not use the controller if the housing shows visible damage.
Caution
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 cables only
into the right-hand side.
Caution
The customer must provide an all-pole disconnecting device, e.g. a
heating emergency switch.
Caution
The cables being connected to the unit must not be stripped by more
than 55mm, and the cable jacket must reach into the housing just to the
other side of the strain relief.
With hydraulic variant D1 - D8 relays R1 and R2 are switched on
simultaneously to allow the connection of another load at R2.
If in D1 speed control is active, R2 is switched on during purging time.
Caution

11
1.Select necessary program/hydraulics
(Fig. B5 resp. D.1 - D.20)
2.Open controller as described under C.1.
3.Strip cables by 55mmmax., insert, fit the
strain relief devices, strip the last 8-9mm
of the wires (Fig. C.2.1)
4.Open the terminals using a suitable
screwdriver (Fig. C.2.1) and make electri-
cal connections on the controller (s. D.1
- D.20)
5.Refit upper part of housing and fasten
with screw.
6.Switch on mains voltage and place con-
troller in operation.
C.2.1
Installation
C.3 Installing the temperature sensors
The temperature sensor cables must be routed separately from mains voltage
cables, and must not, for example, be routed in the same cable duct!
The controller operates with Pt1000 temperature sensors which are accurate to the
degree, thus ensuring optimal control of system functions.
If desired the sensor cables can be extended to a maximum of 30m using a ca-
ble with a cross-section of at least 0.75mm². Make sure that there is no contact
resistance!
Position the sensor precisely in the area to be measured!
Only use immersion, pipe-mounted or flat-mounted sensor suitable for the spe-
cific area of application with the appropriate permissible temperature range.
Caution
Caution

12
Installation
Low voltage max. 12VAC/DC
Terminal: Connection for:
S1 (2x) Sensor 1
S2 (2x) Sensor 2
S3 (2x) Sensor 3
SR24 V3 + V4:
V1 speed controlled
output for High efficiency pumps
- speed controlled
output for High efficiency pumps
Mains voltage 115VAC 50-60Hz
Terminal: Connection for:
R1 Relay 1
N Neutral conductor N
R2 Relay 2
N Neutral conductor N
L Mains phase conductor L
N Mains neutral conductor N
The PE protective conductor must be con-
nected to the PE metal terminal block!
max. 12V
Achtung
Netzseite
115VAC
Gefahr
MainsRelaisKleinspannungen
S3V1
S3 S2 S2 S1 S1 R2 R1LNNN
D. - Terminal connection diagram
Low voltage Relays Mains

13
Installation
D Terminal connection diagrams
D.1 Solar with storage tank
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger
Relay R1 and R2 are both switched on in this vari-
ant, so e.g. a pump can be connected to R2.
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal:Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal:Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Pump L
N Pump N
The PE protective conductor must be connected
to the PE metal terminal block!
D.2 Solar with swimming pool
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 pool
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz
Connection in the right-hand terminal compart-
ment!
Terminal: Connection for:
R2 not used
N not used
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump phase conductor L
N Pump neutral conductor N
The PE protective conductor must be
connected to the PE metal terminal
block!
Sensor side
max. 12V
Mains side
115 VAC
Danger!
Caution!

14
Installation
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 storage
S2 (2x) Sensor 2 storage
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz
Connection in the right-hand terminal compart-
ment!
Terminal: Connection for:
R2 not used
N not used
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump phase conductor L
N Pump neutral conductor N
The PE protective conductor must be
connected to the PE metal terminal
block!
Caution
The heat is transferred from
storage 1 to storage 2
D.4 Storage transfer
Sensor side
max. 12V
Mains side
115 VAC
Danger!
Caution!
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Fühler 1 solid fuel boiler
S2 (2x) Fühler 2 storage tank
S3 (2x) Fühler 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 -
N -
The PE protective conductor must be connected
to the PE metal terminal block!
D.3 Solid fuel boiler
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger

15
D.5 Raising of heat circuit
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 storage
S2 (2x) Sensor 2 backward flow
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz
Connection in the right-hand terminal compart-
ment!
Terminal: Connection for:
R2 not used
N not used
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump phase conductor L
N Pump neutral conductor N
The PE protective conductor must be
connected to the PE metal terminal
block!
Caution
Actuating direction of valve:
R1 on/valve on = direction
through the storage tank
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 storage
S2 (2x) Sensor 2 (optional)
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz
Connection in the right-hand terminal compart-
ment!
Terminal: Connection for:
R2 not used
N not used
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump phase conductor L
N Pump neutral conductor N
The PE protective conductor must be
connected to the PE metal terminal
block!
When S2 is installed = S1
is switch on sensor and S2
switch off sensor.
Caution
Installation
D.6 Thermostat
Sensor side
max. 12V
Mains side
115 VAC
Danger!
Caution!
Sensor side
max. 12V
Mains side
115 VAC
Danger!
Caution!

16
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 flow
S2 (2x) Sensor 2 storage
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz
Connection in the right-hand terminal compart-
ment!
Terminal: Connection for:
R2 not used
N not used
L Mains phase conductor L
N Mains neutral conductor N
R1 stop valve phase conductor L
N stop valve neutral conductor N
The PE protective conductor must be
connected to the PE metal terminal
block!
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 control
S2 (2x) Sensor 2 reference
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz
Connection in the right-hand terminal compart-
ment!
Terminal: Connection for:
R2 not used
N not used
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump phase conductor L
N Pump neutral conductor N
The PE protective conductor must be
connected to the PE metal terminal
block!
Brief description of switching
function: The T function sensor 1
> sensor 2 switches the pump to
relay R.
D.8 Stop valve
D.7 Universal ΔT controller
Sensor side
max. 12V
Mains side
115 VAC
Danger!
Caution!
Sensor side
max. 12V
Mains side
115 VAC
Danger!
Caution!
Installation

17
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal:Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 storage tank low
S3 (2x) Sensor 3 storage tank top
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115 VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal:Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Thermostat function L
N Thermostat function N
The PE protective conductor must be connected
to the PE metal terminal block!
Sensor side
max. 12V
Caution
Mains side
115VAC
Danger
D.10 Solar + Thermostat
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 swimming pool
S3 (2x) Sensor 3 heat exchanger
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump, prim. L
N Pump, primary N
R2 Pump, secondary L
N Pump, secondary N
The PE protective conductor must be connected
to the PE metal terminal block!
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger
D.9 Solar with swimming pool and heat exchanger
Installation

18
Actuating direction of valve:
R2 on/valve on = path through the storage tank
Installation
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 heating circuit return
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Valve L
N Valve N
The PE protective conductor must be connected
to the PE metal terminal block!
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger
D.12 Solar with return lift
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 storage tank low
S3 (2x) Sensor 3 storage tank top
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Zone valve L
N Zone valve N
The PE protective conductor must be connected
to the PE metal terminal block!
D.11 Solar with 2 zone storage tanks
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger
Actuating direction of valve:
R2 on/valve on = charge to sensor 3 (storage
tank above)

19
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 forward flow
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Phase valve L
N Bypass valve N
The PE protective conductor must be connected
to the PE metal terminal block!
D.13 Solar with bypass
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger
Actuating direction of valve:
R2 on/valve on = bypass without storage tank
charging
Installation
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 forward flow
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump, secondary L
N Pump, secondary N
R2 Pump, primary L
N Pump, primary N
The PE protective conductor must be connected
to the PE metal terminal block!
Sensor side
max. 12V
Caution
Mains side
115 VAC
Danger
D.14 Solar with ext. heat exchanger

20
Installation
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector 1
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 collector 2
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump (coll. 1) L
N Pump (coll. 1) N
R2 Pump (coll. 2) L
N Pump (coll. 2) N
The PE protective conductor must be connected
to the PE metal terminal block!
Low voltage max. 12VAC/DC connection in the
left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 collector 1
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 collector 2
The polarity of the sensors is freely selectable.
V1 / - 0-10V or PWM +/- (SR24 Version 3+4)
Mains voltages 115VAC 50-60Hz Connection in
the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Change-over valve L
N Change-over valve N
The PE protective conductor must be connected
to the PE metal terminal block!
D.15 Solar 2 coll. (east/west)
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
115 VAC
Danger
Mains side
115 VAC
Danger
D.16 Solar 2 coll. 2 pumps
Actuating direction of valve:
R2 on/valve on = collector with flow through sen-
sor 3