Steca TR A503 TTR U User manual

Temperature differential controller
with integrated data logger
5 inputs, 3 outputs
742.118 | Z03 | 14.50 | Subject to change due to technical improvements!
EN
Installation and operating instructions

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1. General safety instructions....................................................................3
2. Proper usage .........................................................................................4
3. About these instructions .......................................................................4
3.1 Contents........................................................................................................4
3.2 Target audience ............................................................................................. 4
3.3 Danger levels in warning notices
Évaluation du niveau de risque dans les avertissements....................................4
4. Installation.............................................................................................5
4.1 Opening / Closing the casing ......................................................................... 5
4.2 Mounting the casing .....................................................................................6
4.3 Establishing the electrical connections...........................................................7
4.4 Terminal pin assignments.............................................................................11
5. Commissioning the device for the first time.......................................15
6. Structure ..............................................................................................19
6.1 Casing.......................................................................................................... 19
6.2 Display......................................................................................................... 19
7. Operation.............................................................................................22
7.1 Operating buttons....................................................................................... 22
7.2 Display when operating............................................................................... 22
8. Modes of operation .............................................................................22
8.1 Changing the mode of operation ................................................................22
8.2 "Off" mode................................................................................................... 23
8.3 “Manual” mode...........................................................................................23
8.4 "Automatic" mode........................................................................................ 24
9. Settings menu......................................................................................25
9.1 Overview...................................................................................................... 25
9.2 Calling up the settings menu and selecting a menu entry ..............................28
9.3 Setting the time and date............................................................................28
9.4 Setting the system....................................................................................... 28
9.5 Setting the functions ..................................................................................28
9.6 Setting the parameters ...............................................................................28
9.7 Setting the priority ......................................................................................29
9.8 Resetting to factory defaults........................................................................ 29
10. Functions..............................................................................................30
10.1 Operation ....................................................................................................30
10.2 Characteristics .............................................................................................31
10.3 Functional description ................................................................................. 33
11. Parameters ...........................................................................................47
12. Data logger ..........................................................................................50
12.1 Logging .......................................................................................................50
12.2 Handling the Micro-SD card......................................................................... 51
Contents

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1 General safety instructions
• This document is part of the product.
• Install and use the device only after reading and understanding this document.
• Keep this document in a safe place for the entire service life of the device. Pass the
document on to subsequent owners and operators of the device.
• Adhere to all safety instructions. Consult (further) professional personnel in the
event of any ambiguities.
• The measures described in this document may only be performed by qualified
technical professionals. Exception: End-customers may operate the device when they
have previously been trained by a technical professional.
• The solar energy system can be damaged by improper operation of the device.
• The device must not be connected to the mains power supply when:
– the casing is open or damaged.
– cables are damaged.
• Factory labels and markings must never be altered, removed or rendered unreadable.
• The prescribed conditions of use must be adhered to; more information is provided
in Section 16, p. 57.
• This device is not intended for:
– children.
– persons with physical, sensory or mental impairment.
– persons without sufficient experience or knowledge, unless they are instructed
in the use of the device, and initially supervised, by a person responsible for their
safety.
This product is CSA certified and complies with the requirements of the applicable UL
and CSA standards in terms of design and operating behaviour. Please contact your
dealer should you require further information on this.
13. Dismantling and disposal ....................................................................52
14. Info messages ......................................................................................52
15. Troubleshooting...................................................................................53
15.1 General faults .............................................................................................. 53
15.2 Error messages ............................................................................................ 55
15.3 Checking the Pt1000 temperature sensor....................................................56
16. Technical data ......................................................................................57
16.1 Controller ....................................................................................................57
16.2 Cable specifications ..................................................................................... 58
17. Exclusion of liability.............................................................................58
18. Legal guarantee ...................................................................................59
19. Notes ...................................................................................................59

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2 Proper usage
The temperature differential controller, subsequently referred to as the controller, is an
independently installed electronic temperature controller for on-surface installation.
Integration into a pump assembly is possible when the technical specifications of the
controller are adhered to.
The maintenance-free controller is exclusively intended for controlling solar energy and
heating systems.
3 About these instructions
3.1 Contents
This manual contains all information required by a technical professional for setting up
and operating the temperature differential controller.
3.2 Target audience
The target audience of this manual are technical professionals who:
• have the knowledge of terminology and the skills necessary for setting up and oper-
ating solar energy systems.
• have the necessary training, knowledge and experience, and knowledge of the ap-
plicable regulations in order to evaluate and recognise the dangers inherent in the
following work:
– Installation of electrical equipment
– Production and connection of data communication cables
– Production and connection of mains grid power supply cables
3.3 Danger levels in warning notices
Évaluation du niveau de risque dans les avertissements
Danger level
Niveau de risque
Likelihood of occurrence
Éventualité de l’intervention
Consequences resulting from non-compliance
Conséquences en cas de non-respect
Danger
Danger
Imminent threat of danger
Danger imminent
Death, serious bodily injury
Mort, lésions corporelles graves
Warning
Avertissement
Possible threat of danger
Danger éventuel
Death, serious bodily injury
Mort, lésions corporelles graves
Caution
Attention
Possible threat of danger
Danger éventuel
Minor bodily injury
Lésions corporelles simples
Notice
Avis
Possible threat of danger
Danger éventuel
Property damage
Dommages matériels

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4 Installation
Note
The following section describes only the installation of the
controller
. Follow the instruc
-
tions of each respective manufacturer when installing external components (collectors,
pumps, storage tanks, valves, etc.).
4.1 Opening / Closing the casing
4.1.1 Removing the front panel
X
Grasp the front panel

by the grooves at the sides

and pull forwards

(Fig.
1).
Fig.
1:
Removing the front panel
4.1.2 Mounting the front panel
X
Carefully position the front panel

and then press it onto the casing until it latches
into place.
4.1.3 Removing the terminal cover
Danger
Risk of death by electrocution!
•
Disconnect the controller from the power supply before removing the terminal
cover.
•
Make sure that the power supply cannot be unintentionally switched on when the
device is open.
1.
Remove the screw

(Fig. 1).
2.
Remove the terminal cover

.
4.1.4 Mount the terminal cover.
1.
Position the cover

.
2.
Tighten the screw

to a torque of 0.5
Nm (4.4
lbf
inch).

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4.2 Mounting the casing
√The mounting location must satisfy the prescribed conditions of use; more informa-
tion on this is provided in Section 16, p. 57.
√The mounting surface is vertical and allows good access for installation.
Danger
Risk of death by electrocution!
• Disconnect the controller from the power supply before opening the casing.
• Make sure that the power supply cannot be unintentionally switched on when the
casing is open.
• Do not use the casing as a drilling template.
1. If necessary, remove the terminal cover.
2. Screw in the screw for the upper mounting hole (Fig. 2) until the screw head has
a clearance of 5 ... 7 mm (0.20 ... 0.28 inch) from the mounting surface.
3. Hang the controller on the screw by the upper mounting hole and align it vertically.
4. Mark the position of the lower mounting hole through the casing.
5. Remove the controller and prepare the mounting hole for the lower screw.
6. Hang the controller by the upper mounting hole and then fasten the screw in the
lower mounting hole .
7. Mount the terminal cover.
ø5 (0.20 inch)
ø5 (0.20 inch)
8.5 (0.33 inch)
140 (5.51 inch)
105 (4.13 inch)
156 (6.14 inch)
Fig. 2: Rear side of the controller with the upper and lower mounting holes.

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4.3 Establishing the electrical connections
Danger
Risk of death by electrocution! Make sure that the following conditions are satisfied
when performing the work described in this section:
• All cables leading to the controller must be disconnected from the power supply and
it must be ensured that they cannot be unintentionally reconnected during installa-
tion.
• Each terminal must only be connected to a single conductor.
• The protective earth conductors (PE) from the mains cable and pump and valve
cables must be connected to the protective earth conductor terminal block.
• All cables must be laid so that persons cannot stand on them or trip over them.
• The cables must satisfy the requirements listed in Section 16, p. 57.
• The local power supply must match the specifications on the type plate of the con-
troller.
• The power supply cable is to be connected to the mains power as follows:
– using a plug connected to a wall mains socket or
– via an isolating mechanism allowing complete isolation in the case of permanent
wiring.
• The power supply cable must be laid in conformance to all applicable legal guide-
lines and regulations of the local electricity supplier.
Notice
Danger of damage and malfunction.
• Connect only components that do not overload the controller inputs and outputs;
more information is provided on the type plate and in Section 16, p. 57.
• For outputs R1 and R2, the following applies:
– Speed control must be deactivated when an external relay is connected.
– The correct pump type must be set (standard/high-efficiency pump).
More information on this is provided in Sections 5, p. 15 and 11, p. 47 (P18, P19).
Notes
• Any connection polarity may be used for the 1– 5and RSsignal inputs and outputs.
• Only type Pt1000 temperature sensors may be used.
• Lay the sensor cables at least 100 mm (4 inch) away from any power supply cables.
• Use shielded sensor cables when inductive sources are present, e.g. high-voltage
lines, radio transmitters, microwave devices.

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4.3.1 Position of the terminals
0-10
18
11
11
2
13
13
14
PEPE PE PE
LR1L R2 R3 Rs
Rs
R1 R2Lconst.
Lconst.
NNNN
1 2 3 4 5
A
E.1
E.2
6
7
15
Fig. 3: Terminals in the lower part of the controller (terminal cover removed)
Power connection terminal block:
L1x phase conductor (mains input)
R1, R2 2x output (TRIAC, for pumps or valves)
R3 1x output (relay, for pumps or valves)
Lconst. 2x phase conductor (outputs, permanent voltage)
N4x neutral conductor (common neutral conductors for mains power
input and outputs)
Note
Outputs R1 and R2 are protected by an electronic fuse.
Protective conductor terminal block:
PE 4x protective earth (common protective earth for power connection
terminal block)
Signals terminal block:
1–44x sensor input (Pt1000 temperature sensor)
51x sensor input (Pt1000 temperature sensor or pulse water meter input)
RS1x signal output (potential-free relay contact for safety extra-low voltage)
0–10 R1
0–10 R2 2x control output (for 0–10 V-controlled high-efficiency pumps)
7x mass connection (common mass for sensor inputs and control outputs)
A 1x TTL interface (for TTL/USB interface cable)
Notice
Observe correct polarity! The green conductor of the interface cable
socket must be connected to the left pin (gn) of the strip.
E.1 1x sensor input (Grundfos Direct SensorsTM VFS or RPS)
E.2 1x sensor input (Grundfos Direct SensorsTM VFS or RPS)
Cable openings on the rear side of the casing
Upper strain relief clamps (2 identical plastic links, each with 2 strain relief clamps,
supplied in the scope of delivery)
Lower strain relief clamps
Cable openings at the bottom of the casing

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4.3.2 Preparing the cable openings
The cables can be fed through openings in the rear wall of the casing or at the bottom
of the casing. The openings are pre-punched and must be prepared as required before
installation.
Prepare the cable openings in the rear wall of the casing as follows:
1. Break out the cable openings (Fig. 3) using a suitable tool.
2. Deburr the edges.
Prepare the cable openings at the bottom of the casing as follows:
1. Cut the required cable openings (Fig. 3) at the left and right using a suitable knife
and break them out.
2. Deburr the edges.
4.3.3 Connecting the cables
√All cables are voltage-free.
√The cable openings have been prepared.
XObserve the following points when connecting the cables:
• Connect the cable conductors to the correct terminals as described in Section
4.4, p. 11.
• Mains input and outputs: First connect PE, then Nand L.
• Strain relief:
– First clamp the lower strain relief clamps and then the upper strain relief clamps.
– When using the upper strain relief clamps, use the plastic links as described
below.
– If the opening in the strain relief clamp is too large, e.g. in the case of thin ca-
bles, turn over the strain relief clamping bar (with the bend facing down).
– Only use the strain relief clamps for cables entering the bottom of the casing.
Use external strain relief clamps when feeding cables through the rear of the
casing.

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4.3.4 Inserting / Removing plastic links
Insert the plastic links as follows:
1. Insert the right plastic link with the latching protrusion first (Fig. 4).
2. Press the other side of the plastic link down , until the spring clamp latches into
place.
3. Insert the left plastic link the other way around (latching protrusion to the left,
spring clamp to the right).
Fig. 4: Inserting the right plastic link
Remove the plastic links as follows:
1. Insert a flat-blade screwdriver under the right plastic link between the casing and
the spring clamp , (Fig. 5).
2. Carefully push the flat-blade screwdriver to the left . Lever the spring clamp to
the right until the plastic link is free.
3. Pull out the plastic link upwards by hand .
4. Remove the left plastic link accordingly.
Fig. 5: Removing the right plastic link

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4.4 Terminal pin assignments
For each solar energy system that can be selected at the controller, the external compo-
nents (pumps, valves, temperature sensors) must be connected to particular terminals.
The following table provides information on
• the graphic and number of the solar energy system on the controller display (the
graphic is only intended to provide an overview and is not a technical drawing) and
• the terminal pin assignments of the connected components.
Note
The solar energy systems 5.1to 5.8are designed for systems with a higher-performance
solar circuit pump, e.g. for drainback systems. This pump is connected to the R3 relay
output. The relay output allows higher switching current than the triac outputs R1 and
R2; see Section 16.1, p. 57. The speed of the pump connected to R3 cannot be adjusted.
Display Legend Terminal layout
No system
Note
No system is used when only the functions are used. When No
system is selected, then all inputs and outputs are freely available
for use by the functions. More information on this is provided in
Section 10, p. 30.
1 storage tank, 1 collector array
T1
T2
R1
T1: collector array sensor
T2: lower storage tank sensor
R1: solar circuit pump
1,
2,
R1, N, PE (0–10 R1, 1))
1 storage tank with heating return increase, 1 collector array
R1
R2
T1
T2
T3
T4
T1: collector array sensor
T2: lower storage tank sensor
T3: upper storage tank sensor
T4: heating return increase sensor
R1: solar circuit pump
R2: heating return switching valve 3)
1,
2,
3,
4,
R1, N, PE (0–10 R1, 1))
R2, N, PE
1 storage tank with external heat exchanger, 1 collector array
R2 R1
T1
T2
T3
T1: collector array sensor
T2: lower storage tank sensor
T3: external heat exchanger sensor
R1: storage tank loading circuit pump
R2: solar circuit pump
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE (0–10 R2, 2))
1 storage tank with zone loading, 1 collector array
R1
R2
T1
T2
T3
T1: collector array sensor
T2: lower storage tank sensor
T3: upper storage tank sensor
R1: solar circuit pump
R2: zone loading switching valve 4)
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE

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Display Legend Terminal layout
1 storage tank, 2 collector arrays
R1
R2
T1
T3
T2 T1: collector array 1 sensor
T2: collector array 2 sensor
T3: lower storage tank sensor
R1: solar circuit pump, collector array 1
R2: solar circuit pump, collector array 2
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE (0–10 R2, 2))
2 storage tanks, 1 collector array (pump-controlled)
T1
T2
T3
R1
R2
T1: collector array sensor
T2: lower storage tank 1 sensor
T3: lower storage tank 2 sensor
R1: solar circuit pump, storage tank 1
R2: solar circuit pump, storage tank 2
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE (0–10 R2, 2))
2 storage tanks, 1 collector array (pump-/valve-controlled)
T1
T2
T3
R1 R2
T1: collector array sensor
T2: lower storage tank 1 sensor
T3: lower storage tank 2 sensor
R1: solar circuit pump
R2: storage tank switching valve 5)
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE
1 swimming pool, 1 collector array
R2
T1
T2
T1: collector array sensor
T2: swimming pool sensor
R2: solar circuit pump
1,
2,
R2, N, PE (0–10 R2, 2))
1 swimming pool with external heat exchanger, 1 collector array
R1 R2
T1
T2
T3
T1: collector array sensor
T2: swimming pool sensor
T3: external heat exchanger sensor
R1: solar circuit pump
R2: swimming pool loading circuit
pump
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE (0–10 R2, 2))
1 storage tank, 1 swimming pool, 1 collector array (pump-controlled)
T1
T2
T3
R1
R2
T1: collector array sensor
T2: lower storage tank sensor
T3: swimming pool sensor
R1: storage tank solar circuit pump
R2: swimming pool solar circuit pump
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE (0–10 R2, 2))

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Display Legend Terminal layout
1 storage tank, 1 swimming pool, 1 collector array (pump-/valve-controlled)
R1 R2
T1
T2
T3
T1: collector array sensor
T2: lower storage tank sensor
T3: swimming pool sensor
R1: solar circuit pump
R2: storage tank switching valve 6)
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R2, N, PE
1 storage tank, 1 collector array
T1
T2
R3
T1: collector array sensor
T2: lower storage tank sensor
R3: solar circuit pump
1,
2,
R3, N, PE
1 storage tank with heating return increase, 1 collector array
R3
R2
T1
T2
T3
T4
T1: collector array sensor
T2: lower storage tank sensor
T3: upper storage tank sensor
T4: heating return increase sensor
R3: solar circuit pump
R2: heating return switching valve 3)
1,
2,
3,
4,
R3, N, PE
R2, N, PE
1 storage tank with external heat exchanger, 1 collector array
R3 R1
T1
T2
T3
T1: collector array sensor
T2: lower storage tank sensor
T3: external heat exchanger sensor
R1: storage tank loading circuit pump
R3: solar circuit pump
1,
2,
3,
R1, N, PE (0–10 R1, 1))
R3, N, PE
1 storage tank with zone loading, 1 collector array
R3
R2
T1
T2
T3
T1: collector array sensor
T2: lower storage tank sensor
T3: upper storage tank sensor
R3: solar circuit pump
R2: zone loading switching valve 4)
1,
2,
3,
R3, N, PE
R2, N, PE
2 storage tanks, 1 collector array (pump-/valve-controlled)
T1
T2
T3
R3 R2
T1: collector array sensor
T2: lower storage tank 1 sensor
T3: lower storage tank 2 sensor
R3: solar circuit pump
R2: storage tank switching valve 5)
1,
2,
3,
R3, N, PE
R2, N, PE

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Display Legend Terminal layout
1 swimming pool, 1 collector array
R3
T1
T2
T1: collector array sensor
T2: swimming pool sensor
R3: solar circuit pump
1,
2,
R3, N, PE
1 swimming pool with external heat exchanger, 1 collector array
R3 R2
T1
T2
T3
T1: collector array sensor
T2: swimming pool sensor
T3: external heat exchanger sensor
R3: solar circuit pump
R2: swimming pool loading circuit
pump
1,
2,
3,
R3, N, PE
R2, N, PE (0–10 R2, 2))
1 storage tank, 1 swimming pool, 1 collector array (pump-/valve-controlled)
R3 R2
T1
T2
T3
T1: collector array sensor
T2: lower storage tank sensor
T3: swimming pool sensor
R3: solar circuit pump
R2: storage tank switching valve 6)
1,
2,
3,
R3, N, PE
R2, N, PE
Tab. 1: Terminal pin assignments
1) Terminal pin assignments for 0–10 V-controlled high-efficiency pumps: The power supply must
be connected to output R1 (N, PE); the control cable for the pump electronics must be con-
nected to 0–10 R1 and
2) Terminal pin assignments for 0–10 V-controlled high-efficiency pumps: The power supply must
be connected to output R2 (N, PE); the control cable for the pump electronics must be con-
nected to 0–10 R2 and .
3) Installation regulation: When no power is supplied to the switching valve, then no flow occurs
through the storage tank.
4) Installation regulation: When no power is supplied to the switching valve, then the lower part
of the storage tank (T2) is loaded.
5) Installation regulation: When no power is supplied to the switching valve, then the first priority
storage tank (T2) is loaded.
6) Installation regulation: When no power is supplied to the switching valve, then the storage
tank (T2) is loaded.

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5 Commissioning the device for the first time
Danger
Risk of death by electrocution! Be sure to perform all the measures listed in Section 4
before starting the first commissioning.
Notes
• After commissioning the controller for the first time, it is configured in such a man-
ner that it can be used in most applications without changes.
• After completing the first commissioning, later recommissioning is not necessary.
• The following steps must also be performed after the device has been reset to the
factory defaults.
Overview
Operating mode Off is
switched on.
ESC /
OK
SET
Time
Date
System
Pump R1 (R2)
Type / minimum speed
Functions
ESC /
ESC /
ESC /
The first time the controller is switched on, the follow-
ing settings are made via a guided configuration process
(Fig. left):
• Time and date
• System (hydraulic variant)
• Type (Standard/high-efficiency pump) and minimum
speed of the connected pumps (not System 0.1)
• Functions
Values can be changed later within the guided configura-
tion process. The following applies:
• /ESC/navigate blockwise forwards and back-
wards
(Fig. left: = forwards; ESC/= back).
• Navigation (with /ESC/) is always possible after
completion of a block.
• Later modification of a block is initiated using the
SET button.
Commission the controller for the first time as follows:
Setting the time and date
1. Apply power to the controller.
– The time 12:00 is displayed.
– 12 flashes (Fig. left)
– Backlighting is red.
2. Press  to set the hours.
3. Press SET. The minutes flash.
4. Press  to set the minutes.
5. Press SET. The year flashes.
6. Press  to set the year.
7. Repeat steps 5 and 6 for month and day.
8. Press SET. The set time is displayed.

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Selecting a system
9. Press . System 1.1 is displayed, 1.1flashes (Fig.
left).
10. Press  to select a different system.
11. Press SET.
If in step 10 System 0.1 was selected then proceed
with step 23.
Setting pump 1 (output R1)
12. Press . AC and (pump 1) flash (example in
Fig. left).
13.
Notice
Standard pump: Select AC!
High-efficiency pump: Select HE!
Press  to set the type of pump 1.
14. Press SET.
15.
Notice
Pay attention to the pump characteristics when
selecting HE (high-efficiency pump).
Only if in step 13 HE was selected:
Press  to set the characteristics of the high-effi-
ciency pump; see Tab. 2 and Fig. 6, p. 18.
16. Press SET:
– If in step 15 bA or bb was selected, SC is dis-
played; off, and (pump 1) flash (example
in Fig. left; SC = Speed control).
– If in step 15 Cwas selected, proceed with step
21 (for 2 pumps) or step 23 (1 pump).
17. Press  to switch on the speed control if neces-
sary (on flashes).
18. Press SET.
If off was selected in step 17 then proceed wit step
21 (for 2 pumps) or step 23 (1 pump).
19. min, value %, and (pump 1) flash.
Press to set the minimum speed of pump 1
in %.
20. Press SET.
Set pump 2 (output R2; only if a system with 2 pumps was selected in step 10; other-
wise proceed with step 23).
21. Press . AC and (pump 2) flash (example in
Fig. left).
22. Perform steps 13 to 20 accordingly for pump 2.

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23. Press . F: is displayed.
Set the functions (necessary for System 0.1, or as required for other systems; The func-
tions can also be set at a later date.)
24. Press SET to set the functions. F:01 (function num-
ber) flashes (example in Fig. left).
or
Press to skip the setting of the functions; Ok
flashes. Continue with step 33.
25. Press  to select a different function. (Function
descriptions in Section 10.3)
26. Press SET. oFF is displayed.
27. Press SET. oFF flashes.
28. Press . on flashes.
29. Press SET. The function is activated.
30. Set the characteristic values (see Section 10.1).
31. Press ESC.
32. Press . Ok flashes.
Finishing Initial commissioning
33. Press SET to finish the initial commissioning. The
controller switches to the operating mode Off
(Example in Fig. left).
or
Press /ESC to display the previous settings and
correct them if necessary.
Set the operating mode (off, manual, automatic)
34. Remove the front panel (Fig. left and Section 4.1.1).
35.
Notice
Danger of pump damage if run dry. Only switch the
system to Manual or Automatic mode when the
system is filled.
Press and hold the mode button (arrow
in Fig. left) for 2 seconds to change the operating
mode; more information on this is provided in Sec-
tion 8.
36. Mount the front panel. The controller is now ready
for operation.

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Characteristics of high-efficiency pumps
Display Pump type Characteristic curve
bA High-efficiency pump with a 0–10 V
profile for a rising characteristic curve
(Fig. 6)
0 V: Pump off
10 V: Max. pump speed
bb High-efficiency pump with a 0–10 V
profile for a falling characteristic curve
(Fig. 6)
0 V: Max. pump speed
10 V: Pump off
CPressure regulated high-efficiency pump –
(no control cable, switching on/off
via the supply voltage)
Tab. 2: Characteristics of high-efficiency pumps
U/V
RPM
U/V
RPM
Fig. 6: Characteristics of high-efficiency pumps with 0–10 V profiles for a rising characteristic curve
(bA, left) and a falling characteristic curve (bb, right)

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6 Structure
6.1 Casing
11
13
2
17
16
15
14 ESC
SET
No. Element See
Section
Mode button (under
front panel)
7.1
8
Slot for Micro-SD card (un-
der front panel)
12
Operating buttons , SET,
ESC, 
7.1
Display 6.2
Front panel 4.1
Terminal cover 4.3.1 1)
Terminal cover fastening
screw
–
1) Section 4.3.1 describes the terminals under the
terminal cover.
Fig. 7: Front view of the controller
6.2 Display
6.2.1 Overview
B
l
g
p
1
3
4
2
Fig. 8: Overview of the display areas (all elements visible)
System graphics
Settings menu
Pictograms for functions
Operational and setting values
The display areas are described below.

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6.2.2 System graphics symbols
The following tables describe the symbols used in the system graphics (in Fig. 8).
General
Symbol Description Symbol Description
Pipework Pump, switched on
Collector (array) Pump, switched off
Maximum collector tempera-
ture reached
3-way valve with flow direction
Storage tank Domestic water outlet
Swimming pool Cooler for active cooling
External heat exchanger Back-up heating
Temperature sensor Solid fuel boiler
Sufficient solar irradiation
available for loading
Drainback
Symbols Description
1
2
3
4
5
Drainback tank
Booster pump
Symbol Short startup for drainage assistance
Symbol Draining
Symbol Filling
+Symbol Stabilising
6.2.3 Settings menu
The settings menu (in Fig. 8) contains the following entries:
Time/date System
Functions Parameter
Priority Reset to factory defaults