STECA TR A502 TT Installation and Operating Instructions

STECA TR A502 TT is a temperature differential controller with 5 inputs and 2 outputs, designed for a variety of applications. It features a user-friendly interface, allowing for easy setup and operation. With its advanced control algorithms, STECA TR A502 TT ensures precise temperature control, making it ideal for use in industrial, commercial, and residential settings.

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Temperature differential controller

5 inputs, 2 outputs

Installation and operating instructions

742.114 | Z03 | 14.50 | Subject to change due to technical improvements!

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 ............................................................................. 10

5 Commissioning the device for the first time .......................................13

6 Structure ..............................................................................................17

6.1 Casing .......................................................................................................... 17

6.2 Display ......................................................................................................... 17

7 Operation .............................................................................................20

7.1 Operating buttons ....................................................................................... 20

7.2 Display when operating ............................................................................... 20

8 Modes of operation .............................................................................20

8.1 Changing the mode of operation ................................................................ 20

8.2 "Off" mode ................................................................................................... 21

8.3 “Manual” mode ........................................................................................... 21

8.4 "Automatic" mode ........................................................................................ 22

9 Settings menu ......................................................................................23

9.1 Overview ...................................................................................................... 23

9.2 Calling up the settings menu and selecting a menu entry ..............................26

9.3 Setting the time ........................................................................................... 26

9.4 Setting the system ....................................................................................... 26

9.5 Setting the functions .................................................................................. 26

9.6 Setting the parameters ............................................................................... 26

9.7 Setting the priority ...................................................................................... 27

9.8 Resetting to factory defaults ........................................................................ 27

10 Functions ..............................................................................................28

10.1 Operation .................................................................................................... 28

10.2 Characteristics ............................................................................................. 29

10.3 Functional description ................................................................................. 31

11 Parameters ...........................................................................................45

12 Dismantling and disposal ....................................................................48

13 Info messages ......................................................................................48

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14 Troubleshooting ...................................................................................49

14.1 General faults .............................................................................................. 49

14.2 Error messages ............................................................................................ 50

14.3 Checking the Pt1000 temperature sensor .................................................... 52

15 Technical data ......................................................................................53

15.1 Controller .................................................................................................... 53

15.2 Cable specifications ..................................................................................... 54

16 Exclusion of liability .............................................................................54

17 Legal guarantee ...................................................................................54

18 Notes ...................................................................................................55

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 15, p. 53.

• 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.

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2

3 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.

About these instructions

3.1

3.2

3.3

This manual contains all information required by a technical professional for setting up and operating the temperature differential controller.

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 operating solar energy systems.

• have the necessary training, knowledge and experience, and knowledge of the applicable 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

Danger levels in warning notices

Évaluation du niveau de risque dans les avertissements

Danger level

Niveau de risque

Danger

Warning

Avertissement

Caution

Attention

Notice

Avis

Likelihood of occurrence

Éventualité de l’intervention

Imminent threat of danger

Danger imminent

Possible threat of danger

Danger éventuel

Possible threat of danger

Danger éventuel

Possible threat of danger

Danger éventuel

Consequences resulting from non-compliance

Conséquences en cas de non-respect

Death, serious bodily injury

Mort, lésions corporelles graves

Death, serious bodily injury

Mort, lésions corporelles graves

Minor bodily injury

Lésions corporelles simples

Property damage

Dommages matériels

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4 Installation

Note

The following section describes only the installation of the controller. Follow the instructions 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

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

Carefully position the front panel into place.



and then press it onto the casing until it latches

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 information on this is provided in section 15, p. 53.

√ 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)

5 (0.20 inch)

105

(4.13 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 installation.

• 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 15, p. 53.

• The local power supply must match the specifications on the type plate of the controller.

• 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 guidelines 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 15, p. 53.

• 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. 13 and 11, p. 45 (P18, P19).

Notes

• Any connection polarity may be used for the 1 – 5 and R

signal 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

L R1

R2 X L const.

N N

PE PE

L const.

1 2 3 4

5 R

Fig. 3: Terminals in the lower part of the controller (terminal cover removed)

 Power connection terminal block:

1x phase conductor (mains input)

, R2 2x output (TRIAC, for pumps or valves)

X not used

N const.

2x phase conductor (outputs, permanent voltage)

4x 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:

4x protective earth (common protective earth for power connection terminal block)

 Signals terminal block:

– 4

4x sensor input (Pt1000 temperature sensor)

1x sensor input (Pt1000 temperature sensor or pulse water meter input)

0–10

1x signal output (potential-free relay contact for safety extra-low voltage)

2x control output (for 0–10 V-controlled high-efficiency pumps)

7x mass connection (common mass for sensor inputs and control outputs)



Pin strip, for internal use only.

 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.

Observe the following points when connecting the cables:

• Connect the cable conductors to the correct terminals as described in Section

4.4, p. 10.

• Mains input and outputs: First connect PE, then N and 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 cables, 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.

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 place.



, until the spring clamp latches into

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).

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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

4.4 Terminal pin assignments

For each solar energy system that can be selected at the controller, the external components (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.

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. 28.

1 storage tank, 1 collector array

T1: collector array sensor

T2: lower storage tank sensor

R1: solar circuit pump

, N, PE (0–10 R1,

)

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Display Legend

1 storage tank with heating return increase, 1 collector array

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 storage tank with external heat exchanger, 1 collector array

T1: collector array sensor

T2: lower storage tank sensor

T3: external heat exchanger sensor

R1: storage tank loading circuit pump

R2: solar circuit pump

Terminal layout

, N, PE (0–10 R1, 1) )

, N, PE

, N, PE (0–10 R1, 1) )

, N, PE (0–10 R2, 2) )

1 storage tank with zone loading, 1 collector array

T1: collector array sensor

T2: lower storage tank sensor

T3: upper storage tank sensor

R1: solar circuit pump

R2: zone loading switching valve 4)

, N, PE (0–10 R1,

, N, PE

1 storage tank, 2 collector arrays

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

, N, PE (0–10 R1, 1) )

, N, PE (0–10 R2, 2) )

)

2 storage tanks, 1 collector array (pump-controlled)

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

, N, PE (0–10 R1, 1) )

, N, PE (0–10 R2, 2) )

2 storage tanks, 1 collector array (pump-/valve-controlled)

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)

, N, PE (0–10 R1, 1) )

, N, PE

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Display Legend

1 swimming pool, 1 collector array

T1: collector array sensor

T2: swimming pool sensor

R2: solar circuit pump

Terminal layout

, N, PE (0–10 R2, 2) )

1 swimming pool with external heat exchanger, 1 collector array

T1: collector array sensor

T2: swimming pool sensor

T3: external heat exchanger sensor

R1: solar circuit pump

R2: swimming pool loading circuit pump

, N, PE (0–10 R1, 1) )

, N, PE (0–10 R2, 2)

1 storage tank, 1 swimming pool, 1 collector array (pump-controlled)

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

, N, PE (0–10 R1, 1) )

, N, PE (0–10 R2, 2) )

)

1 storage tank, 1 swimming pool, 1 collector array (pump-/valve-controlled)

T1: collector array sensor

T2: lower storage tank sensor

T3: swimming pool sensor

R1: solar circuit pump

R2: storage tank switching valve 6)

, N, PE (0–10 R1, 1) )

, N, PE

Tab. 1: Terminal pin assignments

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 connected to 0–10

and

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 connected to 0–10

and .

Installation regulation: When no power is supplied to the switching valve, then no flow occurs

4) through the storage tank.

Installation regulation: When no power is supplied to the switching valve, then the lower part of the storage tank (T2) is loaded.

Installation regulation: When no power is supplied to the switching valve, then the first priority storage tank (T2) is loaded.

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 manner 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

ESC

System

ESC

Pump

R1 (R2)

Type / minimum speed

ESC

Functions

ESC

Time

The first time the controller is switched on, the following main settings are made blockwise via a guided configuration process (Fig. left):

• Time

• System (hydraulic variant)

• Type (Standard/high-efficiency pump) and minimum speed of the connected pumps (not System 0.1)

• Functions

Values can be subsequently changed during the guided configuration process. The following applies:

• /ESC/ blockwise navigation forwards and back

(Fig. left:  = forwards; ESC/ = back).

• Navigation (with /ESC/) is always possible after completing a block.

• Subsequent modification of a block is started with

SET

Operation mode Off is switched on.

Commission the controller for the first time as follows:

Setting the time

1. Apply power to the controller.

– The time 12:00 is displayed.

– 12 flashes (Fig. left)

– The 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 time is displayed.

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Selecting a system

6. Press . System 1.1 is displayed, 1.1 flashes

(Fig. left).

7. Press  to select another system.

8. Press SET.

If System 0.1 was selected in step 7, proceed with step 20.

Setting pump 1 (output R1)

9. Press . AC and (pump 1) flash (example in fig. left).

10.

Notice

Standard pump: Select AC!

High-efficiency pump: Select HE!

Press  to select the type for pump 1.

11. Press SET.

12.

Notice

When selecting HE (high-efficiency pump) pay attention to the pump characteristics.

Only if HE was selected in step 10:

Press  to set the characteristic of the high-efficiency pump; see Tab. 2 and Fig. 6, p. 16.

13. Press SET.

– If bA or bb was selected in step 12 then SC is displayed; off, and (pump 1) flash (example in Fig. left; SC = Speed Control).

– If C was selected in step 12, proceed with step 18 (for 2 pumps) or step 20 (for 1 pump).

14. If required, press  to switch on the speed control (on flashes).

15. Press SET.

If off was selected in step 14, proceed with step 18

(for 2 pumps) or step 20 (for 1 pump).

16. min, Value %, and (pump 1) flash.

Press  to set the minimum speed of pump 1 in %.

17. Press SET.

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Set pump 2 (output R2; only if a system with 2 pumps was selected in step 7; otherwise continue with step 20)

18. Press . AC and (pump 2) flash (example in fig. left).

19. Perform steps 10 to 17 accordingly for pump 2.

20. Press . F: is displayed.

Set the functions (necessary for System 0.1, or as required for other systems; The functions can also be set at a later date.)

21. Press SET to set the functions. F:01 (function number) flashes (example in Fig. left).

Press  to skip the setting of the functions; Ok flashes. Continue with step 30.

22. Press  to select a different function. (Function description in Section 10.3)

23. Press SET. oFF is displayed.

24. Press SET. oFF flashes.

25. Press . on flashes.

26. Press SET. The function is activated.

27. Set the characteristics (see Section 10.1).

28. Press ESC.

29. Press . Ok flashes.

Finishing initial commissioning

30. Press SET to finish initial commissioning. The controller switches to the operating mode Off

(Example in Fig. left).

Press /ESC to display the previous settings and correct them if necessary.

Set the operating mode (off, manual, automatic)

31. Remove the front panel (Fig. left and Section 4.1.1).

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32.

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 Section 8.

33. Mount the front panel. The controller is now ready for operation.

Characteristics of high-efficiency pumps

Display Pump type

bA bb

Characteristic curve

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

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

Pressure regulated high-efficiency pump –

(no control cable, switching on/off via the supply voltage)

Tab. 2: Characteristics of high-efficiency pumps

RPM RPM

U/V

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

6.1 Structure

Casing

Fig. 7: Front view of the controller

6.2 Display

6.2.1 Overview

SET

ESC

No. Element



Mode front panel)

button (under



Operating buttons , SET,

ESC

, 



Display

 Front panel

 Terminal cover

See

Section

7.1

6.2

4.1

4.3.1



Terminal cover fastening screw

–

1) Section 4.3.1 describes the terminals under the terminal cover.

g l p

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

Pipework

Symbol Description

Pump, switched on

Collector (array) Pump, switched off

Maximum collector temperature reached

Storage tank

3-way valve with flow direction

Domestic water outlet

Swimming pool

External heat exchanger

Cooler for active cooling

Back-up heating

Temperature sensor Solid fuel boiler

Sufficient solar irradiation available for loading

Drainback

Symbols

Description



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

Functions

Priority

System

Parameter

Reset to factory defaults

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6.2.4 Pictograms for functions

The following table describes the pictograms used for functions ( in Fig. 8).

Symbol Description

Manual

operation

Symbol Description

Holiday – recooling 2)

Pump is speed controlled 1) Alarm output 1)

Interval

Stagnation reduction

Freeze recirculation 2)

Symbol is visible while the function/parameter is being edited in the settings menu.

Symbol flashes: The function is activated and is actively intervening in the control process.

Symbol does not flash: The function is activated and is not actively intervening in the control process or the function is currently being edited in the setting menu.

6.2.5 Operational and setting values

The display of the operational and setting values ( in Fig. 8) consists of the following elements:

1 2

3 4 5 6

g l p



Symbol for time control of functions. This symbol is displayed when:

• a time restriction / control has been set,

• the status of time restriction/control is displayed,

• the time restriction blocks a temperature control (symbol flashes).



Number of the time window that is currently being set/displayed or within which the current time lies.

The time control of a function consists of 1 to 3 configurable time windows. Example:

Time window 1: 06:00 – 08:00

Time window 2: 11:00 – 12:30

Time window 3: 17:00 – 19:00



Additional information: on

, off: switching state/condition on, off max

, min: maximum value, minimum value

Σ: summed operational value since first commissioning, cannot be reset

Δ: summed operational value since last reset to 0



Symbol is displayed when a temperature sensor is selected when setting a function.



Display of:

• Measurements

• Settings

• Error codes

• Additional information, e.g. software version

 Physical unit of the value displayed in : °F, F, psi, gal/min, MBtu, MBtu/h, MMBtu,

%, tn sh CO

Note

The physical units are only displayed as appropriate.

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7

7.1 Operation

This section contains general information on operating the controller.

Operating buttons

The device is operated using the , , SET, ESC and buttons as follows:





SET

ESC

• Scrolls up through the menu/initial commissioning

• Increases the setting value by 1 step

• Scrolls down through the menu/initial commissioning

• Decreases the setting value by 1 step

• Selects a setting to be changed (setting value flashes)

• Confirms a setting value or jumps one level down in the menu structure

• Calls up the settings menu (not in manual mode)

• Discards an entered setting

• Jumps up by one operating level

• Scrolls up through the initial commissioning

Sets the operating mode

Note

We recommend that you write down all settings that you have changed, e.g. in Section 18, p. 55.

7.2 Display when operating

• A flashing component in the system graphic means: the displayed operational or setting value applies to the flashing component.

Exception: always flashes in manual mode.

• A flashing symbol is indicated in the figures by .

• Displays that are automatically alternately displayed are shown overlapping in the figures. Example: Figure in Section 8.2.

8

8.1 Modes of operation

Changing the mode of operation

Notice

Danger of pump damage if run dry. Only switch the system to manual or automatic mode when the system is filled.

1. Remove the front panel.

2. Press the button for 2 seconds to change the mode of operation.

3. Repeat step 2 if necessary.

4. Mount the front panel.

Off

2 s

Manual

operation

2 s

Automatic

2 s

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8.2 "Off" mode

Functionality

• All outputs are switched off (outputs/control outputs without power, relays open).

• OFF and the software version are displayed alternately.

See example in Fig. below: software version St 1.3.

• Backlighting is red.

• Settings menu can be called up.

• The Off mode is preset when the device is delivered.

Operation

Press and hold the SET button for 2 seconds to call up the settings menu ( ).

8.3 “Manual” mode

Functionality

• Backlighting is red, spanner symbol flashes.

• The controller outputs (pumps, valves) can be manually switched. Possible switching states:

: off

: on

: automatic operation as per the settings in the settings menu

• Current temperatures and operating hours can be displayed (status display).

• When changing to manual mode all outputs are switched to A; R1 is displayed.

Exception: initial commissioning (all outputs at 0).

• Typical application: functional test (maintenance), fault-finding.

Operation

You switch the outputs on and off as follows:

1. If necessary, press  to select a different output.

2. Press SET. The switching state flashes.

3. Press  to change the switching state.

4. Press SET to adopt the change.

See in the following Figure (system 1.1 and output R1 are shown as an example).

You display the current temperatures and operating hours as follows:

1. Press ESC. The temperature/operating hours are displayed and the associated component flashes ( , display is not illustrated).

2. Press  to select a different component.

3. Press SET to leave the temperature/operating hours display.

742.114 | 14.50

SET

ESC

SET

8.4 "Automatic" mode

Functionality

Automatic

is the normal mode of operation and the system is automatically controlled.

The following actions are possible:

• Display status (status display): display the status of external components (temperatures, switching states, run times).

• Display stored min./max. values (temperature sensors) or sum/difference values (operating hours 1) of the pumps and valves.

Summed values (symbol

∑): operating hours since initial commissioning. Summed values cannot be reset.

Difference values (symbol Δ): operating hours since the last reset to 0.

• Reset the stored min./max./difference values.

• Call up the settings menu.

1) Summed switch-on times of the outputs

742.114 | 14.50

Operation

√ The controller shows the status display.

You can display the status of external components as follows:

Press  to display the status of other components ( , shown using system 1.1 as an example).

You can display and reset the stored min./max./difference values as follows:

1. Press  as required, in order to display other components ( , component flashes).

2. Press SET. The min./max./difference values are displayed alternately .

3. If desired, press and hold the SET button for 2 seconds to reset the currently (!) displayed value .

4. Press ESC. The status display is shown.

5. Repeat steps 1 to 4 if necessary.

You access the settings menu as follows:

Press and hold SET for 2 seconds . The settings menu appears.

4 5

SET

2 s

SET

2 s

SET

2 s

SET

2 s

SET

2 s

SET

2 s

9

9.1 Settings menu

Overview

The following graphic provides an overview of the structure of the settings menu.

742.114 | 14.50

Time

SET

Set time

System

SET

No system – 0.1

1 storage tank,

1 collector array – 1.1

1 storage tank with heating return increase,

1 collector array – 1.2

1 storage tank with external heat exchanger,

1 collector array – 1.3

1 storage tank with zone loading,

1 collector array – 1.4

1 storage tank,

2 collector arrays – 1.5

2 storage tanks,

1 collector array (pump-controlled) – 2.1

2 storage tanks,

1 collector array (pump/valve-controlled) – 2.2

1 swimming pool,

1 collector array – 3.1

1 swimming pool with external heat exchanger,

1 collector array – 3.2

1 storage tank, 1 swimming pool,

1 collector array (pump-controlled) – 4.1

1 storage tank, 1 swimming pool,

1 collector array (pump/valve-controlled) – 4.2

Functions

SET

Drainback – F01

Circulation – F02

Back-up heating – F03

Solid fuel boiler – F04

Quick charge – F05

Heat quantity – F06

Thermostat – F07

Differential thermostat – F08

Interval – F09

Stagnation reduction – F10

Holiday – recooling – F11

Active cooling – F12

Freeze recirculation – F13

Upper storage tank display – F14

Alarm output – F15

Parameters

SET

Maximum temperature storage tank 1 – P01

Maximum temperature storage tank 2 – P02

Maximum temperature swimming pool – P03

Switch-on temperature difference solar circuit 1

– P04

Switch-off temperature difference solar circuit 1

– P05

Switch-on temperature difference solar circuit 2

– P06

Switch-off temperature difference solar circuit 2

– P07

Switch-on temperature difference external

heat exchanger – P08

Switch-off temperature difference external

heat exchanger – P09

Maximum collector temperature – P10

Minimum collector temperature – P11

Switch-on temperature difference

heating return increase – P12

Switch-off temperature difference

heating return increase – P13

Maximum temperature loading circuit – P14

Minimum temperature loading circuit – P15

Loading strategy storage tank 1 – P16

Loading strategy storage tank 2 – P17

Pump characteristic and speed control R1 – P18

Pump characteristic and speed control R2 – P19

Control of storage tank loading valve – P20

Control of zone loading valve – P21

Control of return increase – P22

Priority

SET

Storage tank 1 before

storage tank 2

Storage tank 2 before

storage tank 1

Only storage tank 1

Only storage tank 2

Factory setting

SET

for 5 seconds

Reset to factory

settings

Only specific functions and parameters may be

called up depending on the selected system.

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Parameters

SET

Maximum temperature storage tank 1 – P01

Maximum temperature storage tank 2 – P02

Maximum temperature swimming pool – P03

Switch-on temperature difference solar circuit 1

– P04

Switch-off temperature difference solar circuit 1

– P05

Switch-on temperature difference solar circuit 2

– P06

Switch-off temperature difference solar circuit 2

– P07

Switch-on temperature difference external

heat exchanger – P08

Switch-off temperature difference external

heat exchanger – P09

Maximum collector temperature – P10

Minimum collector temperature – P11

Switch-on temperature difference

heating return increase – P12

Switch-off temperature difference

heating return increase – P13

Maximum temperature loading circuit – P14

Minimum temperature loading circuit – P15

Loading strategy storage tank 1 – P16

Loading strategy storage tank 2 – P17

Pump characteristic and speed control R1 – P18

Pump characteristic and speed control R2 – P19

Control of storage tank loading valve – P20

Control of zone loading valve – P21

Control of return increase – P22

742.114 | 14.50

Priority

SET

Storage tank 1 before

storage tank 2

Storage tank 2 before

storage tank 1

Only storage tank 1

Only storage tank 2

Factory setting

SET

for 5 seconds

Reset to factory

settings

Only specific functions and parameters may be

called up depending on the selected system.

9.2 Calling up the settings menu and selecting a menu entry

√ Automatic or Off mode is selected.

1. Press and hold SET for two seconds. The settings menu is displayed, menu entry flashes.

2. Press  to select a different menu entry.

3. Change the settings as described in the following sections.

Setting the time 9.3

Note

The time must be once more set to the correct values if power is removed for a longer period of time. After this, the same operating mode is displayed as was active previous to the removal of power.

9.4 Setting the system

Note

A system overview is provided in Section 4.4, p. 10.

√

S yst

flashes.

1. Press SET. The number of the current system flashes.

2. Press  to select another system.

3. Press SET. The change is adopted.

9.5

√

flashes.

1. Press SET. The hours display flashes.

2. Press  to change the hour.

3. Press SET. The minutes flash.

4. Press  to change the minute.

5. Press SET. The change is adopted.

Setting the functions

√

F unc

flashes.

Continue as described in Section 10, p. 28.

9.6 Setting the parameters

Note

Details on the parameters are provided in Section 11, p. 45.

√

P ara

flashes.

1. Press SET. P:01 (parameter number) flashes.

2. Press  to display a different parameter.

3. Press SET. The value of the parameter is displayed, associated components flash in the system graphics.

4. Press SET. The parameter value flashes.

5. Press  to change the value.

6. Press SET to adopt the change.

7. Press ESC. The parameter number is displayed (flashing).

8. If necessary, repeat steps 2 – 7.

742.114 | 14.50

9.7

9.8 Setting the priority

Functionality

The priority determines the sequence in which the storage tanks are loaded (only for systems with more than 1 storage tank). If the higher priority storage tank (first-priority storage tank) cannot be loaded because the collector temperature is too low, then the lower priority storage tank (second-priority storage tank) is loaded 1) . The following values can be selected:

-1-

: only storage tank 1 is loaded.

-2-

: only storage tank 2 is loaded.

1-2

: storage tank 1 is the first-priority storage tank.

2-1

: storage tank 2 is the first-priority storage tank.

Every 30 minutes, the controller checks to see if the first-priority storage tank can be loaded.

Due to the warming of the collector array, this check can take several minutes. On the basis of the heating process, the controller predicts whether it is possible to load the first-priority storage tank in a foreseeable period of time.

Operation

√

P rio

flashes.

1. Press SET. The current value flashes.

2. Press  to change the priority. The system graphics change accordingly.

3. Press SET. The change is adopted.

Resetting to factory defaults

√

flashes; RESEt is displayed (RE and SEt alternately).

1. Press and hold SET for 5 seconds.

2. A progress display is shown for a few seconds. After this the reset is finished.

3. Continue as described in Section 5, p. 13.

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10 Functions

10.1 Operation

Displaying the functions

The following information is visible when the functions are displayed:

• Function number, e.g. F:02 (Fig. left)

• Switching state: on

: function is activated off

: function is deactivated (Fig. left)

Note

If neither on nor off are displayed, then the function cannot be used. Possible causes:

• The set system does not allow the use of this function.

• All outputs are used.

You display the functions as follows:

√

F unc

flashes.

1. Press SET. F:01 flashes.

2. Press  to display the next function.

Activating the function

A function must be activated (activation = on; Fig. left) and all the associated characteristics must be correctly set before it can be used.

If a function is activated and then exited before the characteristics are set, then oFF flashes briefly. After this, the function is displayed with a switching state of off (function is deactivated).

You activate a function as follows:

√ Function number flashes.

1. Press SET. The function is selected.

2. Press SET. oFF flashes.

3. Press . on flashes.

4. Press SET. The function is activated.

5. Set the characteristics as described below.

742.114 | 14.50

Setting the characteristics

The functions have different numbers of characteristics. The characteristic values are always set via the same sequence of operating steps.

You set the values of characteristics as follows:

√ The function has been activated as described previously.

1. Press  to select a characteristic.

2. Press SET. The value of the characteristic and the associated components in the system graphics flash.

3. Press  to change the value.

4. Press SET to adopt the change.

5. Repeat steps 1 to 4 for the other characteristics.

6. Press ESC when all characteristics of the function have been set. The function number flashes.

10.2 Characteristics

The main characteristics for the functions are described below. The figures show examples.

Output

When a function should control an output, instead of the factory setting R- (= no output; Fig. left), one of the outputs R1,

or R

must be selected. Only free outputs are displayed for selection.

Temperature control

When a function is to be temperature controlled, the temperature control must be switched on (tc = temperature control). In the figure, the temperature control is switched off (off).

Input

When a function requires a temperature sensor, a sensor input must be selected instead of the factory setting. The factory setting is " –" (no input; Fig. left).

All sensor inputs are displayed for selection. A single sensor input can be simultaneously used by several functions.

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Switch-on temperature difference

If a function contains a differential thermostat, then the switchon temperature difference can be set. The relevant sensor symbols flash.

Switch-off temperature difference

If a function contains a differential thermostat, then the switchoff temperature difference can be set. The relevant sensor symbols flash.

Switch-on temperature

If a function contains a thermostat, then the switch-on temperature can be set. The relevant sensor symbol flashes.

Switch-off temperature

If a function contains a thermostat, then the switch-off temperature can be set. The relevant sensor symbol flashes.

Time control

If a function is to be time controlled, then the time control must be activated and the time windows must be set (cc = clock control). In the Fig. at the left, the time control is switched off

(off).

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Starting time of a time window

When setting the start time of a time window, the following is displayed to the left of the start time (see Fig. left):

•

• Number of time window 1 ... 3, whose end time is to be set

(in this case: 1)

• on

End time of a time window

When setting the end time of a time window, the following is displayed to the left of the end time (see Fig. left):

•

• Number of time window 1 ... 3, whose end time is to be set

(in this case: 1)

• off

Note

The start time always lies before the end time! When an attempt is made to set a start time that is later than the end time, the end time is automatically adjusted.

10.3 Functional description

The tables in this section describe the function characteristics as follows:

• The rows contain the characteristics in the same sequence as they appear on the display.

• The columns contain the following information, from left to right:

Column Description

Display

Characteristic

Min., max., factory default setting

Sample display when setting the characteristics.

Designation of the characteristics and their interdependence.

Dependent characteristics can only be selected and set when the higher level characteristic has the value on. This is shown as follows:

• Higher-level characteristic: bold text

• Dependent characteristics: indented to the right below the higher level characteristic

Example: In the table for the circulation function (p. 33), the sensor input, switch-on temperature and switch-off temperature characteristics are only displayed when the temperature control is set to on.

Lower (min.) and upper limit (max.) of a characteristic range and the factory setting. When a value range only contains a few values, then these are individually listed. Example: on, oFF.

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10.3.1 Drainback

Notice

Danger of malfunction in drainback systems

• In drainback systems, the drainback function must be activated.

• In drainback systems with speed-controlled solar circuit pumps (systems 1.1 to 4.2), note the following:

– Activation of the drainback function switches off the speed control of the solar circuit pump, but this can be subsequently switched on again if desired (P:18/P:19 in Section 11).

– Adjust the minimum speed high enough so that the heat transfer fluid is reliably pumped into the collector.

The following drainback function characteristics can be set:

Filling time: When switched on, the solar circuit pump runs for the duration of the filling time in order to pump the heat transfer fluid into the collector.

Stabilising time: After the filling time has expired, the solar circuit pump continues to run for the duration of the stabilising time. The following applies:

• The solar circuit pump also continues to run for this time even when the switch-off conditions are satisfied.

• When the speed control is activated and the solar irradiation is too low (no sun symbol on the display) the pump runs at minimum speed.

• After expiry of the stabilising time, the controller checks to see if the solar irradiation is sufficient to continue loading the storage tanks.

Draining time: The solar circuit pump is switched off during the draining time. This allows the heat transfer fluid to flow back into the drainback tank and the solar circuit is automatically drained.

Short startup time: After the draining time has expired, the solar circuit pump runs for the duration of the short startup time (a few seconds). In most cases, this supports the draining process and sucks the remaining heat transfer fluid out of the solar circuit.

Booster pump: The booster pump supports the solar circuit pump during the filling time and short startup time. The booster pump can only be connected when a free output is available.

Notes

• The drainback function cannot be active simultaneously with the following functions:

– Interval

– Reduction of stagnation phases

– Holiday – recooling

– Active cooling

– Freeze recirculation

• The drainback function can only be activated in systems with a

single solar circuit.

742.114 | 14.50

Display Characteristic

Activation

Filling time

Stabilising time

min.

max.

, oFF

1 ... 10 minutes

1 ... 15 minutes

Factory setting

oFF

3 minutes

2 minutes

Draining time:

Short startup time

Booster pump

1 ... 30 minutes

0 ... 60 seconds on

, oFF

5 minutes

0 seconds oFF

Output (booster pump)

Pump type (R1, R2 only)

Pump characteristic (HE only) free output R1/R2/R

, HE 1) bA

, bb, C (see p. 16)

–

Notice

Standard pump: Set AC!

High-efficiency pump: Set HE!

External relay: Set AC pump type!

10.3.2 Circulation

Switches a circulation pump on and off on a temperature and/or time controlled basis.

Temperature control: If the temperature in the circulation return falls below the T

T off on

value, then the circulation pump is switched on until the

temperature is reached.

Time control: The circulation pump is switched on when the current time lies within one of 3 configurable time windows.

Temperature and time control: The circulation pump is switched on when the switch-on conditions for the temperature and time control are satisfied.

Note

Install the circulation sensor at least 1.5 m (60 inch) away from the storage tank to avoid false measurements due to heat conduction of the pipes.

742.114 | 14.50

Display Characteristic

Activation

Output (circulation pump)

Pump type (R1, R2 only)

Pump characteristic (HE only)

Temperature control

Sensor input for circulation return temperature sensor

Switch-on temperature T on

Switch-off temperature T off

Time control

Time window 1 start/end

Time window 2 start/end

Time window 3 start/end

Notice

Standard pump: Set AC!

High-efficiency pump: Set HE!

External relay: Set AC pump type!

min.

max.

, oFF free output R1/R2/R

, HE 1) bA

, bb, C (see p. 16) on

, oFF

1 ... 5

32 °F

T on

+ 4 F on

, off

T off

– 4 F

200 °F

0:00

23:59

Factory setting

oFF

–

– oFF

–

85 °F

95 °F off

6:00/8:00

12:00/13:30

18:00/20:00

10.3.3 Back-up heating

Performs temperature-dependent switching of an output for heating a storage tank using an oil or gas burner. The function can be time restricted.

Temperature control: If the temperature in the storage tank falls below the

T on

value, then the external heating is switched on until the

T perature is reached.

Time restriction: The function is executed when the current time lies within one of 3 configurable time windows.

off

tem-

Display Characteristic

Activation

Output (external heating)

Pump type (R1, R2 only)

Pump characteristic (HE only)

Sensor input for readiness part of the storage tank

Switch-on temperature T on

Switch-off temperature T off

Time restriction

Time window 1 start/end

Time window 2 start/end

Time window 3 start/end

Notice

Standard pump: Set AC!

High-efficiency pump: Set HE!

External consumer (e.g. 115 V relay): Set AC pump type.

min.

max.

, oFF free output R1/R2/R

, HE 1) bA

, bb, C (see p. 16)

1 ... 5

32 °F

T on

+ 4 F on

, oFF

T off

– 4 F

200 °F

0:00

23:59

Factory setting

oFF

–

130 °F

140 °F oFF

6:00/8:00

12:00/13:30

18:00/20:00

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10.3.4 Solid fuel boiler

Controls a pump in order to heat a storage tank using a solid fuel boiler.

The pump is switched on when all of the following conditions are satisfied at the same time:

• The temperature difference between the solid fuel boiler and the storage tank exceeds

T diff on

• The solid fuel boiler temperature lies above the min. solid fuel boiler

temperature.

• The storage tank temperature lies below the max. storage tank

temperature.

The pump is switched off when one of the following conditions is satisfied:

• The temperature difference between the solid fuel boiler and the storage tank drops below

T diff off

• The solid fuel boiler temperature drops below the min. solid fuel

boiler temperature.

• The storage tank temperature reaches the max. storage tank tem-

perature.

Display

Speed control of the pump can be activated as required. The loading strategy of the speed control system attempts to regulate the temperature of the solid fuel boiler to match the control target that has been set.

The control target should be at least 20 F above the minimum temperature of the solid fuel boiler.

Characteristic

Activation

Output (pump)

Pump type (R1, R2 only)

Pump characteristic (HE only)

Speed control (R1, R2 only)

Minimum speed (AC only)

Minimum speed (HE + bA only)

Minimum speed (HE + bb only)

Sensor input for storage tank temperature

Sensor input for solid fuel boiler temperature

Switch-on temperature difference

T diff on

Switch-off temperature difference

T diff off

Max. storage tank temperature

min.

max.

, oFF free output R1/R2/R

, HE 1) 2) bA

, bb, C (see p. 16)

30% on

, oFF 2)

100%

1 ... 5

T diff off

+ 4 F

0 F

32 °F

1 ... 5

40 F

T diff on

– 4 F

300 °F

Factory setting

oFF

–

– oFF

50%

25%

75%

–

12 F

6 F

140 °F

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Min. solid fuel boiler temperature 85 °F 200 °F 125 °F

Control target for solid fuel boiler temperature (Speed control = on)

32 °F 200 °F 140 °F

Notice

Standard pump: Set AC!

High-efficiency pump: Set HE!

Notice

External consumer (e.g. 115 V relay): Set AC pump type and set the speed control to oFF!

10.3.5 Quick charge

Uses a higher loading temperature to load the upper region of the storage tank more quickly in order to provide early prevention of back-up heating by the conventional heating system. To do this, the loading strategy of the first-priority storage tank is changed from differential loading to absolute temperature loading as soon as the temperature in the upper tank region drops below T on

*) . At the same time, an attempt is made to achieve a higher temperature in the storage tank by using the speed control.

*) To retain the proven quick charge functionality, when T of T off

is changed in parallel.

is changed, the value

Note

To use the quick charge function, the speed control must be switched on; more information on this is provided in Section 11, p. 45 (P18, P19).

Display Characteristic

Activation

Sensor input for upper storage tank temperature

Switch-on temperature T on

Switch-off temperature T off

min.

, oFF

1 ... 5

max.

32 °F

T on

+ 4 F

185 °F

T on

+ 20 F

Factory setting

oFF

–

125 °F

130 °F

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10.3.6 Heat quantity

Calculates the acquired heat volume based on the following information:

• Supply temperature

• Return temperature

• Flow rate determined using the following methods:

– Calculated via pump speed

– Measured using a pulse water meter (terminal 5)

Notes

– Calculation based on the pump speed cannot be performed when No system (system 0.1) has been selected.

– In drainback systems, the correct flow rate value can only be read when the system is filled.

• Glycol proportion and accounting for the temperature dependent thermophysical properties of the heat transfer fluid

Additional possibility: display of the amount of CO

2 system. The amount of CO

saved by using the

is calculated from the acquired heat volume.

To do this, the controller requires the conversion factor lbs

CO2

/kWh to be entered. therm

Display Characteristic

Activation

Type of flow rate acquisition min.

max.

, oFF tyP

1, tyP 2

Factory setting

oFF

–

742.114 | 14.50

g l g l g l

Type 1: flow rate value at max. speed F max.

(pump 1).

When the Fig. at the left is displayed (value flashes), then enter the value read from the flow rate display.

Type 1: flow rate value at max. speed F max.

(pump 2) 2)

Type 1: flow rate value at min. speed F min.

(pump 2) 2)

Type 2: flow rate of the pulse water meter in litres/pulse; see the pulse water meter data sheet.

F min.

Type 1: flow rate value at min. speed F min.

(pump 1).

When the Fig. at the left is displayed (value flashes), then enter the value read from the flow rate display.

0.0 gal/min

F min.

0.0 gal/min

999.9

gal/min

F max.

999.9

gal/min

F max.

1.0 gal...10.0 gal

l, 10 l, 25 l

0.0 gal/min

– gal

(no flow rate value selected)

Glycol proportion

Supply sensor input (warm)

Return sensor input (cold)

1 ... 5

60% 40%

–

display

, oFF oFF lbs

CO2

/kWh therm

0.100

2.500

1.918 3)

SET

F unc

1) tyP 1

: calculation of the flow rate from the pump speed. To do this, the displayed flow rate values are entered at two measuring points (pump speed min. and max.).

2) tyP 2

: determining the flow rate using a pulse water meter. The flow rate of the pulse water meter is entered in litres/pulse.

Only for systems with 2 pumps. Enter the displayed flow rate values at F sheet (2007): 1.918 Ibs

CO2

/kWh therm max.

/F min.

in the same manner as with

3) type 1, pump 1.

Source: Hawaiian Electric Co., Inc. HECO Residential Rebate Program, Solar water heating system information

742.114 | 14.50

10.3.7 Thermostat

Switches an output on and off, depending on the temperature range of any desired sensor. The function can be time restricted and is set for heating or cooling as follows:

Heating: The T on

value is set lower than T off

When the sensor temperature drops below T on until the temperature exceeds T off

Cooling: The T on

, the output is switched on

value is set higher than T off

When the sensor temperature exceeds T on until the temperature drops below T off

, the output is switched on

Time restriction: The function is executed when the current time lies within one of 3 configurable time windows.

Note

The T on

value can be set to the same value as T has no practical application.

off

. However, this setting

Display Characteristic

Activation

Output

Pump type (R1, R2 only)

Pump characteristic (HE only)

Sensor input

Switch-on temperature T on

Switch-off temperature T off

Time restriction

Time window 1 start/end

Time window 2 start/end

Time window 3 start/end

Notice

Standard pump: Set AC!

High-efficiency pump: Set HE!

External consumer (e.g. 115 V relay): Set AC pump type!

min.

max.

, oFF free output R1/R2/R

, HE 1) bA

, bb, C (see p. 16)

1 5

32 °F

350 °F

350 °F on

, oFF

0:00

23:59

10.3.8 Differential thermostat

Switches an output on and off as follows – time restricted and depending on the set temperature difference between 2 selectable sensors:

When the temperature difference exceeds T diff on

, the output is switched on until the temperature difference drops below T diff off

. In addition to this, the discharging of the heating source can be limited to a particular temperature range (T src min.

/T src max.

) and the loading of the heating target can be limited to a maximum value (T ).

sink max.

Time restriction: The function is executed when the current time lies within one of 3 configurable time windows.

Speed control of the pump can be activated as required. The loading strategy of the speed control system attempts to regulate the temperature difference to match the switch-on temperature difference that has been set.

Factory setting

oFF

–

70 °F

70 °F oFF

00:00/00:00

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Display Characteristic

Activation

Output

Pump type (R1, R2 only)

Pump characteristic (HE only)

Speed control (R1, R2 only)

Minimum speed (AC only)

Minimum speed (HE + bA only)

Minimum speed (HE + bb only)

Heat source sensor input

Heat sink sensor input

Switch-on temperature difference

T diff on

Switch-off temperature difference

T diff off

Heat source max. temperature

T src max.

min.

max.

, oFF free output R1/R2/R

, HE 1) 2) bA

, bb, C (see p. 16)

30% on

, oFF 2)

100%

1 ... 5

T diff off

+ 4 F 160 F

0 F src min.

+ 4 F

T diff on

– 4 F

350 °F

Factory setting

oFF

–

– oFF

50%

25%

75%

–

12 F

6 F

212 °F

Heat source min. temperature

T src min.

32 °F T src max.

– 4 F 32 °F

Heat sink max. temperature T sink max.

32 °F 200 °F 140 °F

Time restriction

Time window 1 start/end

Time window 2 start/end

Time window 3 start/end

0:00

0:00 on

, oFF

23:59

23:59 oFF

00:00/00:00

Notice

Standard pump: Set AC!

High-efficiency pump: Set HE!

Notice

External consumer (e.g. 115 V relay): Set AC pump type and set the speed control to oFF!

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10.3.9 Interval

Display

Periodically switches the solar circuit pump on and off in order to measure the actual collector temperature. The delay between 2 switch-on operations and the switch-on duration can be set. Applications:

• Collector types where the mechanical construction prevents the temperature from being measured at a suitable place

• Unsuitable position of the temperature sensor on the collector

The function can be time restricted to prevent unnecessary periodic operation at night.

Note

This function cannot be active at the same time as the drainback function.

Characteristic

Activation

Time window start/end

Wait time

min.

max.

0:00

1 min on

, oFF

23:59

999 min

Factory setting

oFF

08:00/19:00

15 min

Switch-on duration 3 s 999 s 5 s

10.3.10 Reduction of stagnation phases

Delays the end of the storage tank's loading phase in order to reduce, or even to avoid, the system standstill (stagnation) times at high temperatures. To do this, the pump is stopped repeatedly, and only briefly switched on again at high collector temperatures. Since the efficiency drops heavily at high collector temperatures, the loading takes longer and possible stagnation occurs later.

Note

This function cannot be activated

• in systems with swimming pools,

• when the drainback function is activated.

Display Characteristic

Activation min.

, oFF

max.

Factory setting

oFF

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10.3.11 Holiday – recooling

Attempts to reduce, or even to avoid, the system standstill (stagnation) times at high temperatures. To do this, at night the storage tank – or the second-priority storage tank if 2 storage tanks are present – is charged as far as possible to the set minimum temperature, if the storage tank temperature during the day was 20 F below the set maximum temperature.

Stagnation occurs when not enough hot water is removed from the system during an absence (holiday).

Notes

The following applies to this function:

• Only activate if you intend to be absent for an extended period.

• Deactivate this after returning from a holiday in order to avoid an unnecessary waste of energy via the collector circuit.

• This function cannot be activated in systems with swimming pools.

• This function cannot be active at the same time as the drainback function.

Display Characteristic

Activation

Minimum storage tank temperature:

min.

max.

32 °F on

, oFF

200 °F

Factory setting

oFF

95 °F

10.3.12 Active cooling

Switches an additional cooler into the solar circuit when one of the following conditions is satisfied:

• The temperature of the storage tank – or of the second-priority storage tank in the case of 2 storage tanks – lies 20 F below the set maximum temperature.

• Holiday recooling is performed at night.

Application examples: areas with strong solar irradiation, avoidance of stagnation.

Note

This function cannot be active at the same time as the drainback function.

Display Characteristic

Activation

Output (switching-in of additional cooler)

min.

max.

, oFF free output R1/R2/R

Factory setting

oFF

–

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10.3.13 Freeze recirculation

Attempts to prevent freezing of the collectors by pumping heat from the first-priority storage tank into the collectors:

• The collector temperature is below 40 °F: solar circuit pump is switched on.

• The collector temperature is above 45 °F: solar circuit pump is switched off.

The freeze recirculation function is only useful when the heat transfer fluid contains insufficient or no anti-freeze. It is recommended to generally use heat transfer fluid with anti-freeze!

Notice

Despite the freeze recirculation function being activated, the solar energy system can freeze under the following conditions:

• The first-priority storage tank is unloaded and a back-up heating system is not present.

• Heat transfer fluid contains insufficient or no anti-freeze.

• Power outage.

• Unsuitable position of the temperature sensor on the collector.

• Collector sensor or cable is broken or has a short circuit.

• The collectors are installed in a position exposed to the wind.

• Solar circuit pump is faulty.

Note

This function cannot be active at the same time as the drainback function.

Display Characteristic

Activation min.

, oFF

max.

Factory setting

oFF

10.3.14 Display storage tank top

Shows the temperature in the upper region of 1 or 2 storage tanks. For this, an appropriate sensor must be connected to each tank. The measured temperatures are not used for control purposes.

Display Characteristic

Activation

Storage tank 1 upper sensor input

Storage tank 2 upper sensor input 1)

1) Only for systems with 2 storage tanks

min.

, oFF

1 ... 5

max.

Factory setting

oFF

–

10.3.15 Alarm output

Activates the set output in the case of the following faults:

• Sensor fault due to short-circuit or interruption.

• Clock loses the current time due to an extended power outage.

• Volume flow fault: Er: 1 1) .

• The electronic overload switch or fuse has triggered: Er: 3 ... Er: 6

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Display Characteristic

Activation

Output

Control

1) More information is provided in Section 14.2, p. 50.

2) norm

= normal: contact closes when a fault occurs.

InV

= inverted: contact opens when a fault occurs.

min.

max.

, oFF free output R1/R2/Rs norm

, InV 2)

Factory setting

oFF

– norm

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11 Parameters

Note the following when setting parameters:

• Observe the operating data of the solar components used.

• The individual parameters are only displayed and can be changed when this is permitted by the type of solar energy system that has been set.

Special case: system 0.1 has no parameters; no P is displayed.

• In most applications, the controller can be used without modifying any parameters.

More information is provided in the Functionality column.

The figures in this section show examples.

Display Parameter

Maximum temperature storage tank 1

min.

32 °F

Maximum temperature storage tank 2

32 °F

max.

200 °F

Functionality

Factory setting

140 °F When the maximum temperature is exceeded, no more loading occurs until the temperature drops to 6 F below the set value.

140 °F

Maximum temperature swimming pool

Switch-on temperature difference solar circuit 1

50 °F

P05

+ 4 F

115 °F

100 F

Switch-off temperature difference solar circuit 1

0 F

Switch-on temperature difference solar circuit 2

P07

+ 4 F

P04

– 4 F

100 F

85 °F

16 F

8 F

When the maximum temperature is exceeded, no more loading occurs until the temperature drops to 1 F below the set value.

When the switch-on temperature difference between collector and storage tank is reached, the storage tank is loaded.

Loading ends when the switch-off temperature difference is reached.

16 F

Switch-off temperature difference solar circuit 2

0 F

Switch-on temperature difference external heat exchanger

P09

+4 F

P06

– 4 F

100 F

Switch-off temperature difference external heat exchanger

0 F T

P08

– 4 F

8 F

12 F

6 F

When the switch-on temperature difference between the secondary side of the external heat exchanger and the storage tank is reached, the storage tank is loaded.

Loading ends when the switch-off temperature difference is reached.

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Display Parameter

Maximum collector temperature

Minimum collector temperature

min.

P11

+ 40 F

32 °F

max.

350 °F

P10

– 40 F

Functionality

Factory setting

270 °F When the maximum collector temperature is exceeded, no more loading occurs until the temperature drops to 6 F below the set value.

32 °F Load only starts when the minimum collector temperature is exceeded.

Switch-on temperature difference heating return increase

Switch-off temperature difference heating return increase

Maximum temperature loading circuit

Minimum temperature loading circuit

Loading strategy storage tank 1

Control target of differential temperature loading

(dIFF)

Control target of absolute temperature loading (AbS)

Loading strategy storage tank 2

Control target of differential temperature loading

(dIFF)

Control target of absolute temperature loading (AbS)

P13

P15

+ 4 F

0 F

+ 40 F

32 °F

4 F

4 F dIFF

32 °F dIFF

32 °F

100 F

P12

270 °F

P14

– 40 F

, AbS

– 4 F

100 F

200 °F

, AbS

100 F

200 °F

12 F

6 F

212 °F The difference between P14 and the temperature of the secondary side of the heat exchanger controls the solar circuit pump and the storage tank loading pump. 1)

32 °F

16 F

140 °F

16 F

The storage tank loading pump is only switched on when the secondary side of the heat exchanger is greater than or equal to P15.

The loading strategy depends on the storage tank system used and the usage of the system.

diff

: highest efficiency. The control target is the temperature difference between the collector and the storage tank. 4)

AbS

: Useful when the system requires particular temperatures, e.g. to avoid switching on the external back-up heating system.

The control target is the temperature of the collector. 4)

140 °F

The heating return increase is switched on (switching valve on) when the switch-on temperature difference between the storage tank and heating return temperature is reached.

When the switch-off temperature difference is reached, the heating return increase is switched off.

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Display

Parameter

Control of the return increase

min.

Pump type R1

Pump characteristic (HE only)

Speed control

(R1, R2 only)

Minimum speed

(AC only)

Minimum speed

(HE + bA only)

Minimum speed

(HE + bb only)

Pump type R2

Pump characteristic (HE only)

Speed control

(R1, R2 only)

Minimum speed

(AC only)

Minimum speed

(HE + bA only)

Minimum speed

(HE + bb only)

Control of the storage tank loading valve

AC,

HE bA

, bb, C (see p. 16)

30% on

, oFF

100%

0% 100%

AC,

HE bA

, bb, C (see p. 16)

30% on

, oFF

100%

100% norm

, InV

Control of the zone loading valve norm

, InV norm

max.

, InV

Functionality

50%

25%

75%

– oFF

Factory setting

– oFF

Notice

Danger of malfunctions in the controller or damage to the components.

must be set when using a high-efficiency pump and

must be set when using a standard pump!

Set speed control to oFF when an external relay is connected or speed control is not wanted.

50%

25%

75% norm norm norm norm

(normal) must be set when the valve has been installed according to the installation instructions in Section 4.4, p. 10.

InV

(inverted) must be set when the valve has been installed in a different way compared to the installation instructions.

Tab. 3: Parameters

1) When the secondary side of the heat exchanger reaches 6 F below P14, the solar circuit pump is switched off. At 20 F below P14, the solar circuit pump is switched on again.

When the secondary side of the heat exchanger reaches P14, the storage tank loading pump is

2) switched off. Below P14, the storage tank loading pump is switched on again.

diFF is a fixed value for swimming pools.

3) The factory setting depends on the system that has been set.

4) The pump speed is adjusted accordingly to achieve the control target.

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12 Dismantling and disposal

Danger

Risk of death by electrocution!

• Disconnect the device from the power supply before opening the casing.

• All work on an open device must be performed by professional personnel.

1. To dismantle the controller, follow the installation instructions in the reverse order; see Section 4.

2. Dispose of the device in accordance with the local regulations.

13 Info messages

Display Description

The maximum collector temperature has been reached; the solar circuit pump in the respective solar circuit has been switched off.

The symbols in the status display flash when the temperature of the respective collector is selected.

The maximum collector temperature has been reached; the solar circuit pump in the respective solar circuit has been switched off.

is shown in the status display when the temperature of the respective collector is not selected.

The maximum storage tank temperature has been reached.

The symbols in the status display flash when the temperature of the respective storage tank is selected.

Tab. 4: Info messages

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14 Troubleshooting

Danger

Risk of death by electrocution!

• Immediately disconnect the device from the mains supply when it can no longer be operated safely, e.g. in the case of visible damage.

• Disconnect the device from the mains power before opening the casing.

• All work on an open device must be performed by professional personnel.

Note

The controller is a quality product, conceived for years of continuous trouble-free operation. Observe the following points:

• Faults are often caused by connected components and not by the controller.

• The following notes on fault identification indicate the most common causes of faults.

• Only return the controller when you are absolutely sure that none of the problems listed below is responsible for the fault.

14.1 General faults

Display Possible cause Remedy

Controller not functioning at all

Display empty/ dark

Controller power supply is interrupted.

• Check the controller power cable.

• Check the fuse for the power supply.

Controller constantly displays 12:00

flashes.

Controller power supply was interrupted for longer than 15 minutes.

Set the time.

Solar circuit pump not operating + switch-on condition is fulfilled

Pump power supply is interrupted.

Check the pump power cable.

Pump has seized up.

• The maximum storage tank temperature has been reached.

• The maximum collector temperature has been reached.

• In multi storage tank systems: the system has stopped due to a priority test.

• The minimum collector temperature has not been reached.

• The maximum loading temperature has been reached.

• Stagnation reduction is activated and is actively intervening in the control process.

• The storage tank has been deactivated in the priority settings.

flashes Pump has been switched off in manual mode

(off).

Get the pump working again, replace if necessary.

No fault.

• No fault.

• Switch to automatic mode if necessary.

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Display Possible cause Remedy

Solar circuit pump is operating + switch-on condition not fulfilled

• The following functions are activated and are actively intervening in the control process:

– Interval function

– Holiday function

– Freeze recirculation function

• Blockage protection for the pumps is being performed.

• No fault.

• Deactivate the relevant function, if necessary.

flashes Pump has been switched on in manual mode

(on).

• No fault.

• Switch to automatic mode if necessary.

Solar circuit pump is operating + switch-on condition is fulfilled + no heat transport in the solar circuit (no heat transfer fluid circulation)

Air is in the solar circuit.

Check the solar circuit for air.

The isolating valve is closed.

Check the isolating valve.

Limescale or contamination in solar circuit. Clean the solar circuit (flush).

Solar circuit pump shows cycle behaviour

Temperature difference too small.

Collector sensor incorrectly positioned.

Adjust temperature difference in the Parameters settings menu.

Check the position of the collector sensor and correct if necessary.

Tab. 5: General faults

14.2 Error messages

When an error message is displayed and no button has been pressed for 5 minutes, the backlighting turns red and starts flashing.

The figures in this section show example systems.

Error message Description

An interruption was detected at the displayed sensor input (in this case: sensor input 2).

Remedy

Check the cable and sensor connected to the sensor input.

A short-circuit was detected at the displayed sensor input (in this case: sensor input 2).

Check the cable and sensor connected to the sensor input.

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Tab. 6: Error messages

The controller has detected a flow rate fault in the primary or secondary circuit. A permanently high temperature difference exists between the heat source and loading target.

Primary and secondary circuit pumps are flashing. Possible causes:

• Air in system.

• The isolating valve is closed.

• The pump is faulty.

The controller has detected faulty operation of the system. This is probably caused by swapped collector connections.

• Bleed air from the system.

• Check the isolating valve.

• Check the pump.

Check the collector connections.

A short-circuit exists at output R1; the pump connected to output R1 flashes.

Possible causes:

• The pump is faulty.

• Wiring fault.

• Check the pump.

• Check the wiring from R1.

Output R1 is overloaded; the pump connected to output R1 flashes.

Cause: The permissible values for R1 specified on the type plate have been permanently exceeded; the output has been switched off.

A short-circuit exists at output R2; the pump connected to output R2 flashes.

Possible causes:

• The pump is faulty.

• Wiring fault.

Check the electrical data of the pump; replace pump if necessary. R1 is automatically switched on again.

• Check the pump.

• Check the wiring from R2.

Output R2 is overloaded; the pump connected to output R2 flashes.

Cause: The permissible values for R2 specified on the type plate have been permanently exceeded; the output has been switched off.

Check the electrical data of the pump; replace pump if necessary. R2 is automatically switched on again.

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14.3 Checking the Pt1000 temperature sensor

Danger

Risk of death by electrocution! Before opening the device, make sure that all cables leading to the device have been disconnected from the mains power and cannot be unintentionally reconnected to the mains power.

1. Remove the terminal cover.

2. Disconnect the temperature sensor.

3. Measure the resistance of the temperature sensor with an ohmmeter and compare with the following table. Small deviations are acceptable.

4. Mount the terminal cover.

Temperature-resistance assignments

Temperature [°F]

Temperature [°C]

Resistance [Ω]

–22

–30

882

–4

–20

922

–10

104

122

140

158

961 1000 1039 1078 1117 1155 1194 1232 1271

Temperature [°F]

Temperature [°C]

Resistance [Ω]

176

194

212

100

230

110

248

120

266

130

284

140

302

150

320

160

338

170

356

180

1309 1347 1385 1423 1461 1498 1536 1573 1611 1648 1685

Tab. 7: Temperature-resistance assignment with Pt1000 temperature sensors

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15 Technical data

15.1 Controller

Inputs/outputs

Rated voltage (system voltage)

Own consumption

Outputs R1, R2

Quantity

Type

Switching current

Voltage

Signal inputs/outputs

115 ... 230 V~, 50/60 Hz

≤ 0.8 W, two Pt1000 temperature sensors connected

TRIAC

1.1 (1.1) A each

115 ... 230 V~, 50/60 Hz

Signal inputs 1 ... 5

Quantity

Type of signal inputs 1 ... 4

Type of signal input 5

Pt1000 (temperature acquisition)

Pt1000 (temperature acquisition) or pulse water meter using 1 gal/pulse, 2 gal/pulse,

5 gal/pulse, 10 gal/pulse, 1 l/pulse, 10 l/pulse, 25 l/pulse

(flow rate acquisition)

Signal output R

Type

Max. contact load

Signal outputs 0–10 R1, 0–10 R2

Type

Min. working resistance

Interfaces

potential-free NO contact

1 (0) A, 24 V

0 – 10 V

10 kΩ

TTL interface

Type

Application

6-pin strip connection of a TTL/USB interface cable; further information can be obtained from your dealer

Hydraulic schemes (systems)

Quantity

Display

Type

Application conditions

Degree of protection

Protection class

Ambient temperature

Physical specifications

Dimensions L x W x H

Weight

Software class

Type of action

Type of fastening for permanently connected cables

Degree of pollution

Ball pressure test temperature

Overvoltage category

LCD display with backlighting

IP22, DIN 40050 (without front panel: IP20)

32 ... 122 °F, when wall-mounted

110 x 160 x 51 mm (4.33 x 6.30 x 2.01 inch)

370 g (0.82 lbs)

A type 1.Y

type X

Casing pan: 257 °F

Other casing parts: 167 °F class II (2500 V)

Tab. 8: Technical controller data

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15.2 Cable specifications

Mains cable

Mains cable type

External diameter of mantle

Conductor cross-section

Single strand (solid)

Fine strand (with core end sleeves)

Diameter of the internal strain relief

Signal cable

Sensor cable length

Sensor extension cable

Design

Cross-section of each conductor

H05 VV-... (NYM…)

6.5 to 10 mm (0.25 to 0.4 inch)

≤ 2.5 mm

≤ 1.5 mm

2 (#AWG 14)

2 (#AWG 16)

6.5 to 10 mm (0.25 to 0.4 inch)

≤ 100 m (330 ft.), including extension twisted-pair conductors for lengths > 10 m (33 ft.)

0.75 mm

(#AWG 18) for lengths < 50 m (165 ft.)

1.50 mm 2 (#AWG 16) for lengths > 50 m (165 ft.)

Tab. 9: Technical data of the cables connected to the controller

16 Exclusion of liability

The manufacturer can neither monitor the compliance with this manual nor the conditions and methods during the installation, operation, usage and maintenance of the controller. Improper installation of the system may result in damage to property and, as a result, to bodily injury.

Therefore, the manufacturer assumes no responsibility and liability for loss, damage or costs which result from or are in any way related to incorrect installation, improper operation, incorrect execution of installation work and incorrect usage and maintenance.

Similarly, we assume no responsibility for patent right or other right infringements of third parties caused by usage of this controller.

The manufacturer reserves the right to make changes to the product, technical data or installation and operating instructions without prior notice.

17 Legal guarantee

In accordance with German statutory regulations, there is a 2-year legal guarantee on this product for the customer.

The seller will remove all manufacturing and material faults that occur in the product during the guarantee period and affect the correct functioning of the product. Natural wear and tear does not constitute a malfunction. No legal guarantee can be offered if the fault can be attributed to third parties, unprofessional installation or commissioning, incorrect or negligent handling, improper transport, excessive loading, use of improper equipment, faulty construction work, unsuitable construction location or improper operation or use. Legal guarantee claims shall only be accepted if notification of the fault is provided immediately after it is discovered. Guarantee claims are to be directed to the seller.

The seller must be informed before guarantee claims are processed. For processing a guarantee claim, an exact fault description and the invoice / delivery note must be provided.

The seller can choose to fulfil the legal guarantee either by repair or replacement. If the product can neither be repaired nor replaced, or if this does not occur within a suitable period in spite of the specification of an extension period in writing by the customer, the reduction in value caused by the fault shall be replaced, or, if this is not sufficient taking the interests of the end customer into consideration, the contract is cancelled.

Any further claims against the seller based on this legal guarantee obligation, in particular claims for damages due to lost profit, loss-of-use or indirect damages are excluded, unless liability is obligatory by law.

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18 Notes

...........................................................................................................................................

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742114

Key features

5 inputs for connecting multiple temperature sensors
2 outputs for controlling heating or cooling devices
Versatile modes of operation, including manual and automatic control
Large, backlit display for clear visibility in all lighting conditions
Compact design for space-saving installation
Quick and easy installation with screw terminals
Suitable for a wide range of applications, including solar thermal systems, heat pumps, and industrial processes