Sorel TDC 2 User manual

Read carefully before installation, commissioning and operation
Temperature Difference Controller TDC2
Installation and operating instructions
Temperature-Difference-Controller
TDC 2

Inhalt
A.1 EC declaration of conformity 3
A.2 General instructions 3
A.3 Explanation of symbols 3
A.4 EC declaration of conformity 4
A.5 Warranty and liability 4
B.1 Specifications 5
B.2 About the controller 6
B.3 Scope of supply 6
B.4 Disposal and pollutants 6
B.5 Hydraulic variants 7
C.1 Wall installation 8
C.2 Electrical connection 9
C.3 Installing the temperature sensors 10
D Terminal connection diagrams 11
E.1 Display and input 21
E.2 Commissioning help 22
E.3 Free commissioning 22
E.4 Menu sequence and menu structure 23
1. Measurement values 24
2. Statistics 25
2.1 Operating hours 25
2.2 Average temperature difference ∆T 25
2.3 Heat output 25
2.4 Graphic overview 25
2.5 Events 25
2.6 Reset/clear 25
3. Display mode 26
3.1 Schematic 26
3.2 Overview 26
3.3 Alternating 26
4. Operating modes 27
4.1 Automatic 27
4.2 Manual 27
4.3 Off 27
4.4 Fill system 27
5. Settings 28
5.1 Tmin S1 28
5.2 Tmin S2 28
5.3 Tmin S3 28
5.4 Tmax S2 29
5.5 Tmax S3 29
5.6 ∆T R1 29
5.7 ∆T R2 30
5.8 Tset S3 30
5.9 Hysteresis 30
5.10 Priority sensor 31
5.11 T priority 31
5.12 Loading time 31
5.13 Increase 31
5.14 Thermostat periods 32
5.15 „Party Function“ 32
5.16 TsavS3 32
6. Protective functions 34
6.1 Seizing protection 34
6.2 Frost protection 34
6.3 System protection 35
6.4 Collector protection 35
6.4.1 Cooling functions 36
6.5 Col.- Alarm 36
6.6 Recooling 36
6.7 Anti-Legionella 37
7. Special functions 38
7.1 Program selections 38
7.2 Time & date 38
7.3 Sensor calibration 38
7.4 Commissioning 39
7.5 Factory settings 39
7.6 Expansions 39
7.7 Heat quantity 39
7.8 Start aid function 40
7.9 Speed control 41
7.9.1 Variant 41
7.9.2 Purging time 42
7.9.3 Sweep time 42
7.9.4 Max. speed 42
7.9.5 Min. speed 42
7.9.6 Setpoint 42
8. Menu lock 43
10. Language 43
9. Service values 44
Z.1. Malfunctions 45
Z.2 Replacing the fuse 46
Z.3 Maintenance 46

3
Safety instructions
By affixing the CE mark to the unit the manufacturer declares that the Temperature-
Difference-Controller 2, hereinafter refererred to as TDC2 , conforms to the following
relevant safety regulations:
- EC low voltage directive
73/23/EEC, as amended by 93/68/EEC
- EC electromagnetic compatibility directive
89/336/EEC version 92/31/EEC version 93/68/EEC
Conformity has been verified and the corresponding documentation and the EC decla-
ration 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!

4
Safety instructions
A.4 EC declaration of conformity
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

5
2.1 Specifications
Electrical specifications:
Mains voltage 230VAC +/- 10%
Mains frequency 50...60Hz
Power consumption 2VA
Switched power
Mechanical relay R1 460VA for AC1 / 185W for AC3
Mechanical relay R2 460VA for AC1 / 185W for AC3
Internal fuse 2A slow-blow 250V
Protection category IP40
Protection class II
Sensor inputs 3 x Pt1000
Measuring range -40°C up to 300°C
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 163mm x 110mm x 52mm
Aperture installation
dimensions 157mm x 106mm x 31mm
Display Fully graphical display, 128 x 64 dots
Light diode Multicolour
Operation 4 entry keys
Temperature sensors: (may not be included in the scope of supply)
Collector or boiler sensor Pt1000, e.g. immersion sensor TT/S2 up to 180°C
Storage tank sensor Pt1000, e.g. immersion sensor TT/P4 up to 95°C
Pipe-mounted sensor Pt1000, e.g. pipe-mounted sensor TR/P4 up to 95°C
Sensor leads 2x0.75mm² extendable up to 30m max.
Temperature resistance table for Pt1000 sensors
B.1 Specifications
°C 0 102030405060708090100
Ω1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
Description of controller

6
The Temperature Difference Controller TDC2 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 TDC2 can be used as a temperature difference controller for the various system
variants illustrated and explained under B.5.
Important characteristics of the TDC2:
- 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 previously selected values or factory settings
- A wide range of additional functions are available.
B.2 About the controller
Description of controller
- Temperature Difference Controller TDC2
- 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 TDC2
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.

7
Description of controller
B.5 Hydraulic variants
Caution
The following illustrations should be viewed only as schematic dia-
grams 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 protec-
tors, etc., and must therefore be provided.
14
7
10
14
18
13
17
2
58
11
15
19
3
6
912
16
20
(ΔT-controller) (2xΔT-controller)
ΔT2xΔT

8
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

9
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 „Solar+storage“ relays R1 and R2 are swit-
ched on simultaneously to allow the connection of another load at R2.
Caution

10
1.Select necessary program/hydraulics
(Fig. B5 resp. D.1 - D.16)
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

11
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 low
S3 (2x) Sensor 3 storage tank top
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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 con-
nected 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
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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 con-
nected to the PE metal terminal block!
D Terminal connection diagrams
D.1 Solar with storage tank
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
D.2 Solar + Thermostat
Relay R1 and R2 are both switched on in
this variant, so e.g. a pump can be con-
nected to R2.

12
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 se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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!
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 se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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.3 Solar with bypass
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
D.4 Solar with return lift
Actuating direction of valve:
R2 on/valve on = bypass without storage
tank charging

13
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 se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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!
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 se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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.5 Solar with 2 zone storage tanks
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
D.6 Solar with ext. heat exchanger
Actuating direction of valve:
R2 on/valve on = charge to sensor 3
(storage tank above)

14
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 se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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 se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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.7 Solar 2 coll. (east/west)
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
D.8 Solar 2 coll. 2 pumps
Actuating direction of valve:
R2 on/valve on = collector with flow through
sensor 3

15
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 1
S3 (2x) Sensor 3 storage tank 2
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump (St.1) L
N Pump (storage tank 1) N
R2 Pump (storage tank 2) L
N Pump (storage tank 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
S2 (2x) Sensor 2 storage tank 1
S3 (2x) Sensor 3 storage tank 2
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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.9 Solar 2 Storage tank/valve
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
D.10 Solar 2 storage tank/2 pu.
Actuating direction of valve:
R2 on/valve on = charge to sensor 3
(storage tank 2)

16
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 1
S3 (2x) Sensor 3 storage tank 2
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Pump (storage tank 2) L
N Pump (storage tank 2) N
The PE protective conductor must be
connected to the PE metal terminal block!
D.11 Solar with follow-on storage tank/Solar & transfer“
Sensor side
max. 12V
Caution
Mains side
230VAC
2
2
2
2
2
Danger
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 forward flow
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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
230VAC
2
2
2
2
2
Danger
D.12 Solar with swimming pool and heat exchanger

17
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 swimming pool
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Pump (sec.)+valve L
N Pump (sec.)+valve 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
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 (optional)
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Air cooler L
N Air cooler N
The PE protective conductor must be
connected to the PE metal terminal block!
D.13 Solar storage tank/pool
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
Actuating direction of valve:
R2 on/valve on = charge to sensor 3
(swimming pool)
D.14 Solar + cooling 1
Description of cooling function see 6.4.1

18
D.15 Solar + cooling 2
D.16 Solar + cooling 3
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 low
S3 (2x) Sensor 3 storage tank top
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump, prim. L
N Pump, primary N
R2 Pump cooler L
N Pump cooler 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
S2 (2x) Sensor 2 storage tank
S3 (2x) Sensor 3 optional
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Pump cooler L
N Pump cooler N
The PE protective conductor must be
connected to the PE metal terminal block!
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
Description of cooling function see 6.4.1
Description of cooling function see 6.4.1

19
Installation
D.17 Solar + solid fuel boiler
D.18 Solar + valve + 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 storage tank
S3 (2x) Sensor 3 solid fuel boiler
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 Pump solid fuel L
N Pump solid fuel 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
S2 (2x) Sensor 2 storage tank low
S3 (2x) Sensor 3 storage tank top
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
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
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger

20
Brief description of switching function:
The ΔT function sensor 1 > sensor 2
switches the pump to relay R1.
The thermostat function via sensor 3
switches the pump to relay R2.
D.19 Universal ΔT controller
Installation
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 (thermostat)
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 e.g. pump L
N e.g. pump N
The PE protective conductor must be
connected to the PE metal terminal block!
Sensor side
max. 12V
Sensor side
max. 12V
Caution
Caution
Mains side
230VAC
2
2
2
2
2
Danger
Mains side
230VAC
2
2
2
2
2
Danger
Brief description of switching function:
The ΔT function sensor 1 > sensor 2
switches the pump to relay R1.
The ΔT function 2 > sensor 3
switches the pump to relay R2.
Low voltage max. 12VAC/DC connection
in the left-hand terminal compartment!
Terminal: Connection for:
S1 (2x) Sensor 1 (control)
S2 (2x) Sensor 2 (ref.+contr.)
S3 (2x) Sensor 3 (reference)
The polarity of the sensors is freely se-
lectable.
Mains voltages 230VAC 50-60Hz Con-
nection in the right-hand terminal com-
partment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L
N Pump N
R2 e.g. pump L
N e.g. pump N
The PE protective conductor must be
connected to the PE metal terminal block!
D.20 Universal 2x ∆T-controller