AkoTec TDC3 Guide

AkoTec Produktionsgesellschaft mbH * Grundmühlenweg 3 * 16278 Angermünde
Tel: [phone] * Fax: [phone] * Email: [email protected] * www.akotec.eu
Installation and
Commissioning Manual
Temperature Difference Controller
TDC 3

07/2015 Temperature Difference Controller TDC 3 Page 2of 47
Contents
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 Message log 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.
Setting
s
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 31
5.15 „Party Function“ 32
5.16 Energy saving mode 32
5.17 TecoS3 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 with
error messages 45
Z.2 Replacing the fuse 46
Z.3 Maintenance 46

07/2015 Temperature Difference Controller TDC 3 Page 3of 47
A.1 EC declaration of conformity
instructions
By affixing the CE mark to the unit the manufacturer declares that the Temperature-Difference-
Controller 3, hereinafter refererred to as TDC 3, 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 declaration of conformity are kept on file by the manufacturer.
A.2 General instructions It is essential that you read this!
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, commissioning and operation of
the unit.
The valid accident prevention regulations, VDE regulations, the regulations of the local 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 function and operation of the controller. Always keep these instructions in
the vicinity of the controller.
A.3 Explanation of symbols
.
Danger
Danger
Caution
Caution
Information which is especially important for the function and
optimal use of the unit and the system.
Failure to observe these instructions can result in destruction of the unit
or the
system, or damage to the environment.
Failure to observe these instructions can result in serious damage to
health such as scalding, or even life-threatening injuries.
Failure to observe these instructions can result in danger to life from
electric voltage.

07/2015 Temperature Difference Controller TDC 3 Page 4of 47
A.4 Changes to the unit
- Changes, additions to or conversion of the unit are not permitted without the written
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 example
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
A.5 Warranty and liability
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
- Unauthorized 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
Danger
Changes to the unit can compromise the safety and function of the unit or the entire
system.

07/2015 Temperature Difference Controller TDC 3 Page 5of 47
B.1 Specifications
Electrical specifications:
Mains voltage 230 VAC +/- 10%
Mains frequency 50...60 Hz
Power consumption 2 VA
Switched power
Electronic relay R1 min.20 W...max.120 W for AC3
Mechanical relay R2 460 VA for AC1 / 185 W for AC3
Internal fuse 2 A slow-blow 250 V
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 163 mm x 110 mm x 52 mm
Aperture installation
Dimensions 157 mm x 106 mm x 31 mm
Display Fully graphical display, 128 x 64 dots
Light diode Multi-color
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 2 x 0.75 mm² extendable up to 30 m max.
Temperature resistance table for Pt1000 sensors
°C 0 10 20 30 40 50 60 70 80 90 100
Ω1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385

07/2015 Temperature Difference Controller TDC 3 Page 6of 47
B.2 About the controller
The Temperature Difference Controller TDC 3 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 TDC 3 can be used as a temperature difference controller for the various system
variants illustrated and explained under B.5.
Important characteristics of the TDC 3:
- 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 Scope of supply
- Temperature Difference Controller TDC 3
- 3 screws 3,5 x 35 mm and 3 plugs 6 mm for wall installation
- 6 strain relief clips with 12 screws, replacement fuse 2A slow-blow
- Installation and operating instructions TDC 3
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.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.
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.
Caution

07/2015 Temperature Difference Controller TDC 3 Page 7of 47
B.5 Hydraulic variants
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.
Caution

07/2015 Temperature Difference Controller TDC 3 Page 8of 47
C.1 Wall Installation
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 3mounting
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.
C.1.1
C.1.2

07/2015 Temperature Difference Controller TDC 3 Page 9of 47
C.2 Electrical connection
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 compliance with the applicable regulations. Do
not use the controller if the housing 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 cables only into the right-hand side.
The customer must provide an all-pole disconnecting device, e.g. a heating
emergency switch.
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.
Relay R1 is only suitable for standard pumps (20 - 120 VA) which are speed-
controlled via the controller. The internal wiring of the controller is such that residual
currents flow over relay R1 even in the rest condition.
Therefore under no circumstances may valves, contactors or other consumers with
low power consumption be operated on this output.
With hydraulic variant D1 „Solar + storage“ relays R1 and R2 are switched on
simultaneously to allow the connection of another load at R2.
Danger
Caution
Caution
Caution
Caution
Caution

07/2015 Temperature Difference Controller TDC 3 Page 10 of 47
1. Select necessary program/hydraulics
(Fig. B5 resp. D.1 - D.20)
2. Open controller as described under
C.1.
3. Strip cables by 55 mm max., insert,
fix the strain relief devices, strip the last
8 - 9 mm of the wires (Fig. C.2.1)
4. Open the terminals using a suitable
screwdriver (Fig. C.2.1) and make
electrical 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
controller in operation.
C.3 Installing the temperature sensors
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 30 m using a cable
with a cross-section of at least 0.75 mm². 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
specific area of application with the appropriate permissible temperature range.
The temperature sensor cables must be routed separately from mains voltage
cables, and must not, for example, be routed in the same cable duct!
Caution
Caution
C
.2.1

07/2015 Temperature Difference Controller TDC 3 Page 11 of 47
D Terminal connection diagrams
D.1 Solar with storage tank
Relay R1 and R2 are both switched on in
this variant, so e.g. a pump can be connected
to R2.
Relay R1: For speed control of
standard pumps, minimum load
20VA
D.2 Solar + Thermostat
Sensor side
max. 12 V Mains side
230 VAC
Caution
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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N
R2 Pump L (no speed)
N Pump N
The PE protective conductor must be connected
to the PE metal terminal block!
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
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. 12 V Mains side 230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution

07/2015 Temperature Difference Controller TDC 3 Page 12 of 47
D.3 Solar with bypass
Actuating direction of valve:
R2 on/valve on = bypass without storage
tank charging
D.4 Solar with return lift
Actuating direction of valve:
R2 on/valve on = path through the storage
tank
Sensor side
max. 12 V Mains side
230 VAC
Caution
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N
R2 Phase valve L
N Bypass valve N
The PE protective conductor must be connected
to the PE metal terminal block!
Sensor side
max. 12 V Mains side 230 VAC
Low voltage
max. 12 VAC/DC con
nection
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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N
R2 Valve L
N Valve N
The PE protective conductor must be connected
to the PE metal terminal block!
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution

07/2015 Temperature Difference Controller TDC 3 Page 13 of 47
D.5 Solar with 2 zone storage tanks
Actuating direction of valve:
R2 on/valve on = charge to sensor 3
(storage tank above)
D.6 Solar with ext. heat exchanger
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N
R2 Zone valve L
N Zone valve N
The PE protective conductor must be connected
to the PE metal terminal block!
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump, secondary L (speed)
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!
Caution
Caution

07/2015 Temperature Difference Controller TDC 3 Page 14 of 47
D.7 Solar 2 coll. (east/west)
Actuating direction of valve:
R2 on/valve on = collector with flow through
sensor 3
D.8 Solar 2 coll. 2 pumps
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
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!
Sensor side
max. 12 V Mains side
230 VAC
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz 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 (speed)
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!
Caution

07/2015 Temperature Difference Controller TDC 3 Page 15 of 47
D.9 Solar 2 Storage tank/valve
Actuating direction of valve:
R2 on/valve on = charge to sensor 3
(storage tank 2)
D.10 Solar 2 storage tank/2 pu.
Sensor side
max. 12 V Mains side
230 VAC
Low voltage
max. 12 VAC/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 selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
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!
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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 selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump (St.1) L (speed)
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!
Sensor side
max. 12 V Mains side
230 VAC
Caution

07/2015 Temperature Difference Controller TDC 3 Page 16 of 47
D.11 Solar with follow-on storage tank/Solar & transfer“
D.12 Solar with swimming pool and heat exchanger
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Cau
tion
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 selectable.
Mains voltages 230VAC 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 (speed)
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!
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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 fl ow
The polarity of the sensors is freely selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump, prim. L (speed)
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!
Caution

07/2015 Temperature Difference Controller TDC 3 Page 17 of 47
D.13 Solar storage tank/pool
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
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Low voltage
max. 12 VAC/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 selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
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!
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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.
Mains voltages 230VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N
R2 Air cooler L
N Air cooler N
The PE protective conductor must be
connected to the PE metal terminal block!
Caution

07/2015 Temperature Difference Controller TDC 3 Page 18 of 47
D.15 Solar + cooling 2
Description of cooling function see 6.4.1
D.16 Solar + cooling 3
Description of cooling function see 6.4.1
Sensor side
max. 12 V Mains side
230 VAC
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N (speed)
R2 Pump cooler L
N Pump cooler N
The PE protective conductor must be
connected to the PE metal terminal block!
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump, prim. L (speed)
N Pump, primary N (speed)
R2 Pump cooler L
N Pump cooler N
The PE protective conductor must be
connected to the PE metal terminal block!
Caution

07/2015 Temperature Difference Controller TDC 3 Page 19 of 47
D.17 Solar + solid fuel boiler
D.18 Solar + valve + thermostat
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Low voltage
max. 12 VAC/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 selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N (speed)
R2 Pump solid fuel L
N Pump solid fuel N
The PE protective conductor must be
connected to the PE metal terminal block!
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Low voltage
max. 12 VAC/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.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
N Pump N
R2 Valve L
N Valve N
The PE protective conductor must be
connected to the PE metal terminal block!

07/2015 Temperature Difference Controller TDC 3 Page 20 of 47
D.19 Universal ∆T controller
Brief description of switching function:
The ∆T function sensor 1 > sensor 2
switches the pump to relay R1.
The thermostat function via sensor 3
switches the pump to relay R2.
D.20 Universal 2x ∆T-controller
Brief description of switching function:
The ∆T function sensor 1 > sensor 2
switches the pump to relay R1.
The ∆T function 2 > sensor 3
switches the pump to relay R2.
Sensor side
max. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Low voltage
max. 12 VAC/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 selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
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. 12 V Mains side
230 VAC
Relay R1: For speed control of
standard pumps, minimum load 20 VA
Caution
Low voltage
max. 12 VAC/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 selectable.
Mains voltages 230 VAC 50-60 Hz Connection
in the right-hand terminal compartment!
Terminal: Connection for:
L Mains phase conductor L
N Mains neutral conductor N
R1 Pump L (speed)
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!