Steca TR A301 Installation And Operating Instructions Manual
STECA TR A301 is a high-performance solar charge controller that offers a wide range of features to optimize the charging process of your solar batteries. With its advanced Maximum Power Point Tracking (MPPT) algorithm, the controller ensures that your solar panels are always operating at their optimal power point, maximizing energy harvest. The TR A301 also includes a comprehensive display that provides real-time information on system performance, including charging current, battery voltage, and charging status.
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SOLARTHERMIE - SOLAR THERMAL SYSTEMS - SOLAR TÉRMICO - SOLAIRE THERMIQUE - SOLARE TERMICO
Installation and operating instructions
T
emperature difference controller
3 inputs, 1 PWM control signal for an ECM pump
These operating instructions are part of the product.
Read the instructions carefully before use, keep them over the entire lifetime of the product, and pass them on to any future owner or user of this product.
EN
738.955 | Z01 | 10.40 | Subject to change due to technical improvements!
EN
Inhalt
1 About these instructions .......... 3
1.1 Applicability ................................. 3
1.
Users ............................................ 3
1.3 Description of symbols ................ 4
2 Safety ........................................ 5
.1 Proper usage ............................... 5
.
Improper usage ........................... 5
.3 Dangers during assembly / commissioning .................................6
.4 Detecting faults ........................... 7
.5 Exclusion of liability ..................... 7
3 Description ................................ 9
3.1 Controller in the solar circuit ....... 9
3.
Casing overview ......................... 10
4 Installation ............................. 11
4.1 Opening / closing the casing ...... 11
4.
Installation ................................. 1
4.3 Electrical connection .................. 13
5 Display overview ..................... 17
6 Commissioning ...................... 18
7 Description of the controller functions ................................. 20
7.1 Switch-on / switch-off temperature difference ..............
0
7.
Maximum storage tank temperature ..............................
0
7.3 Maximum collector temperature .
1
7.4 Tube collector function ..............
1
7.5 Anti-freeze function ...................
7.6 Holiday function ........................
3
7.7 Flow test service function ..........
4
7.8 Speed control ............................
4
8 Operation ................................ 26
8.1 Setting the controller (main menu) 6
8.
Setting the controller (settings menu) ........................................ 31
9 Maintenance ........................... 38
9.1 Causes of problems ................... 38
9.
Testing the temperature sensor .... 4
10 Dismantling and disposal ....... 43
11 Legal guarantee ..................... 44
12 Technical data ......................... 46
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1 About these instructions
1.1
Applicability
These instructions describe the installation, commissioning, function, operation, maintenance and dismantling of the temperature difference controller for controlling an ECM high-efficiency pump within a solar thermal system (ECM = Electronic Commutated
Motor). When installing the remaining components, e.g. solar collectors, pump assemblies and storage units, be sure to observe the appropriate installation instructions provided by each manufacturer.
1.2
Users
Installation, commissioning, operation, maintenance and dismantling of the controller may only be performed by trained professional personnel. Before commissioning, the controller must be professionally assembled and installed by professional personnel in accordance with the applicable regional and transregional regulations as well as the safety instructions and general instructions within these installation and operating instructions. The professional personnel must be familiar with these operating instructions.
Use the controller only after first thoroughly reading and understanding these operating instructions and the safety instructions. Adhere to all safety instructions. In the event of any ambiguities regarding the operation and alteration of parameters or functions, consult professional personnel.
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1.3
Description of symbols
1.3.1
Structure of the warning notices
SIGNAL WORD
Type, source and consequences of the danger!
Measures for avoiding danger.
1.3.2
Danger levels in warning notices
Danger level Likelihood of occurrence
DANGER
WARNING
CAUTION
CAUTION
Imminent threat of danger
Possible threat of danger
Possible threat of danger
Possible threat of danger
Consequences resulting from non-compliance
Death, serious bodily injury
Death, serious bodily injury
Minor bodily injury
Property damage
1.3.3
Notes
Note
Note on easier and safer working habits.
Measure for easier and safer working habits
Pictogram with corresponding warning symbol.
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1.3.4
Other symbols and markings
Symbol
✓
•
Emphasis on issue at hand
Meaning
Condition for action
Call to action
Result of action
List
Emphasis on issue at hand
2 Safety
2.1
Proper usage
The temperature difference controller – hereinafter referred to as controller – is an independently installed electronic temperature controller for on-surface installation. The controller may only be used for controlling solar thermal systems within the permissible ambient conditions (see section 1 "Technical data").
•
•
•
2.2
Improper usage
The controller must not be operated in the following environments:
• outdoors in damp rooms in rooms where highly flammable gas mixtures can occur in rooms in which the operation of electrical and electronic components may cause dangers to arise
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•
•
•
2.3
Dangers during assembly / commissioning
The following dangers exist during installation / commissioning of the controller and during operation (in case of installation errors):
Risk of death by electrocution
Risk of fire due to short-circuit
Damage to any of the constructional fire safety measures present in the building due to incorrectly installed cables
• Damage to the controller and connected devices due to improper ambient conditions, inappropriate power supply and connecting prohibited devices or faulty devices and incorrect assembly or installation
Therefore, all safety regulations apply when working on the mains supply. Only electricians may perform work that requires opening the controller (such as connection work).
When laying cables, ensure that no damage occurs to any of the constructional fire safety measures in the building.
Make sure that the permissible ambient conditions at the mounting location are not exceeded (see section 1 ).
Be sure to comply with the specified degree of protection.
Factory labels and markings may not be altered, removed or rendered unreadable.
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Before connecting the device, make sure that the power supply matches the specifications on the type plate.
Make sure that all devices which are connected to the controller conform to the technical data of the controller.
Secure the device against unintentional start-up.
All work on an open controller must be performed with the mains supply disconnected.
Protect the controller against overloading and short-circuiting.
2.4
Detecting faults
Check the display regularly.
In case of faults, isolate the cause (see section 9).
As soon as it becomes evident that safe operation is no longer possible (e.g. visible damage), disconnect the device from the mains supply immediately.
Have professional personnel remedy the fault.
2.5
Exclusion of liability
The manufacturer cannot monitor the compliance to these instructions as well as 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, we assume no responsibility and liability for loss, damage or costs which result from or are
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EN in any way related to incorrect installation, incorrect execution of installation work, improper operation 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.
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3 Description
3.1
Controller in the solar circuit
3.1.1
The purpose of the controller
The controller provides speed control of the ECM pump in a solar thermal system (see section 7 "Description of the controller functions").
3.1.2
The structure of the solar circuit
Temperature sensor 1
(collector sensor)
Collector
T1
Temperature difference controller
Storage tank
Solar circuit
ECM pump T
T2
V
Optional:
Grundfos Direct
Sensors TM VFS 1-12
Temperature sensor 2
(lower area of storage tank)
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3.1.3
The function of the solar circuit
The controller constantly compares the temperatures between the collector (T1) and the lower area of the storage tank (T ). Once the sun heats the collector and there is a temperature difference of 8 K between the collector and the storage tank, the pump is switched on.
The pump extracts the heat transfer fluid from the lower cooler area of the storage tank and pumps it to the collector. The heat transfer fluid in the collector is heated by the sun and flows back to the storage tank.
The heat transfer fluid heats the domestic water via a heat exchanger located in the storage tank.
3.2
Casing overview
Operating switch
The following modes of operation can be selected:
- On
for commissioning
and functional test
- Auto for normal operation
- Off
to switch-off the pumps
On
Auto
Off
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Display
Display for controller operation and system settings
Operating buttons
Arrow up
SET button
Arrow down
Connections grid, pump, temperature sensors
Hinge grooves
EN
4 Installation
4.1
Opening / closing the casing
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 back on.
Do not damage the casing.
Only switch the power supply back on after the casing has been closed.
Operating buttons
Screw
Lower casing
Upper casing
The top of the casing is held in place by two retaining pegs on the upper edge of the bottom half of the casing and fastened with a screw.
4.1.1
Opening the casing
Loosen the screw and remove the upper casing in an upwards direction.
4.1.2
Closing the casing
Place the upper casing over the lower casing at an angle. Insert the hinge grooves into the retaining pegs of the lower casing.
Pivot the upper casing down and feed the operating buttons through the matching holes.
Fasten the casing tightly with the screw.
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4.2
Installation
WARNING
Risk of electrical shock and fire if mounted in a damp environment!
Only assemble the controller in an area where the degree of protection is sufficient.
4.2.1
Mounting the controller
CAUTION
Risk of injury and damage to the casing when drilling!
Do not use the casing as a drilling template.
Choose a suitable mounting location.
Drill the upper fastening hole.
Screw in the screw.
Remove the upper casing.
Hang the casing in the recess .
Mark the position of the lower fastening holes , .
Remove the casing again.
Drill the lower fastening holes.
Re-hang the casing in the recess .
Screw the casing firmly using the lower fastening holes
and .
Mount the upper casing.
3
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134
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2
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4.3
Electrical connection
DANGER
Risk of death by electrocution!
Disconnect the controller from the power supply before opening the casing.
Observe all applicable legal guidelines and regulations of the local electricity supplier.
NOTE
The device is to be connected to the grid by means of a plug with grounding contact, or in the case of a fixed electrical installation via a disconnection device for complete disconnection in accordance with the installation guidelines.
4.3.1
Preparing the cable feed
The cables may enter the device through the rear of the casing or the lower side of the casing.
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Feeding cable through rear of casing (fig.
1):
WARNING
Risk of electrical shock and fire due to cables coming loose!
Install an external strain relief for the cables.
Remove the plastic flaps from the rear side of the casing using an appropriate tool.
Feeding the cable through the lower side of the casing (fig.
2):
SET
Fig. 1: cable feed from the rear
WARNING
Risk of electrical shock and fire due to cables coming loose!
Fasten the cables to the casing using the strain-relief clamps provided.
Cut the left and right plastic flaps using an appropriate tool and break them out of the casing.
4.3.2
Connecting the cables
If a protective conductor is provided or required for the pump, connect the protective conductor to the terminal clamps of the controller. When connecting the protective conductor, observe the following points:
-
Make sure that the grounding contact is also connected to the controller's mains supply side.
NOTE
Observe the instructions in the ECM pump data sheet.
6
SET
Fig. 2: cable feed from below
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-
-
-
-
-
Each terminal may only be connected to a single connecting wire (max .5 mm ).
The spring terminals are approved for connection of cables as follows: single wire (solid): ≤ 2.5 mm² fine strand (flexible): ≤ 2.5 mm² (the stranded wires must be twisted with 1 twist per 0 mm)
fine strand (with core end sleeves): ≤ 1.5 mm²
Only use the original temperature sensors (Pt1000) that are approved for use with the controller.
-
Observe the following points:
Polarity of the sensor contacts is not important.
Do not lay sensor cables close to 30 volt or 400 volt cables (minimum separation: 100 mm).
If inductive effects are expected, e.g. from heavy current cables, overhead train cables, transformer substations, radio and television devices, amateur radio stations, microwave devices etc. , then the sensor cables must be adequately shielded.
-
-
Sensor cables may be extended to a maximum length of 100 m.
For extension cables, select the following cable cross sections:
0.75 mm up to 50 m long
1.5 mm up to 100 m long
Connect the cables in accordance with the terminal plan.
Use only the Grundfos Direct Sensor TM VFS 1-1 that is approved for the controller.
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4.3.3
Terminal plan
L N R1 N C T1 T2
Pr ot ec co nd tiv e uc to r
Gr id
AT
30
Po we r s up
V
TE
NT
~
IO
N: r t ply
fo pu m he p
V olt
EC
M
30
V
~ ag e a lw pr ay s es en t!
PW
M
co nt fo ro r E
Te l s
CM m ign
p pe al um ra tu p re
se
(lo
(co
Te we
Optional:
Grundfos Direct
Sensors TM VFS 1-1 ns or m r a lle pe re
1 cto ra r)
se ns tu re a o f s to ra ge or
ta nk
)
4.3.4
Actuating the connecting terminals
NOTE
The connecting terminal may only be actuated with an appropriate tool. An unsuitable tool or too much mechanical pressure can damage or even destroy the connecting terminal.
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13
1
5 Display overview
1
15
T1
T1
!
max
T2
ºC ºF
D
T1
min max
°
E
3
4
5
7
6
11
1 Temperature sensor symbols
Top T1 = collector sensor
Bottom T1 = sensor for tube collector function
T = sensor for lower area of storage tank
Display for temperature values, operating hours and fault symbols, e.g. short circuit, interruption (see page 40) or "SYS" = system error (see page 41)
3 Display for temperature unit °C / °F
4 ECM pump operating hours
5 Setting the maximum storage tank temperature (max) and display of min/max temperature values
10 9 8
8
9
Speed control
Holiday function (see page 35)
10 Anti-freeze function (see page 34)
11 Symbols for pump operation and heat transfer fluid circulation
1 Display for "Maximum storage tank temperature has been reached"
13 Warning sign in the case of a fault e.g. short circuit, interruption (see page 40) or "SYS" = system error (see page 41)
14 Display when the maximum collector temperature is reached, means possible evaporation of the collector fluid
6 Tube collector function
7 Setting the temperature unit °C / °F
15 Display when the switch-on temperature difference is reached, means "sufficient heat available"
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6 Commissioning
6.1
Testing the pump
CAUTION
Damage to pump caused by dry operation!
Make sure that the solar circuit is filled with heat transfer fluid.
✓
✓
✓
The controller casing is closed.
All connections are properly made.
The solar energy system is filled.
Connect the mains supply.
To switch on the pump, set the operating switch to the upper position (on).
The display is lit with a red background.
on appears in the display. After approx. 3 seconds on flashes in alternation with the display.
To switch off the pump, set the operating switch to the lower position (off).
The display is lit with a red background.
off appears in the display. After approx. 3 seconds off flashes in alternation with the display.
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CAUTION
The incorrect operating mode may cause the system to shut down or impair proper functioning!
After testing the pump, always set the operating switch to automatic operation.
To set the controller to automatic operation, move the operating switch to the middle position (Auto).
Aut is shown in the display for approx. 3 seconds.
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7 Description of the controller functions
7.1
Switch-on / switch-off temperature difference
The controller constantly compares the temperatures between the collector (T1) and the lower area of the storage tank (T ). As soon as the temperature in the collector (T1) is 8 K (constant fixed value) higher than the temperature in the storage tank (T ), the following display appears:
•
•
The sun symbol is displayed
If no safety limits prohibit the pump from operating, the PWM control signal for the pump appears at output C. The display shows this message.
The pump symbol rotates
If the temperature difference falls below 4 K (constant fixed value), the PWM control signal for the pump at output C is switched off. The sun symbol is no longer shown on the display.
NOTE
The power supply for the ECM pump at output R1 always remains switched on. The ECM pump is controlled exclusively by the PWM control signal at output C.
7.2
Maximum storage tank temperature
The maximum storage tank temperature function is to prevent the hot water tank from overheating. If the
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•
• lower area of the storage tank (T ) reaches the set maximum storage tank temperature (factory setting of 60 °C), charging is stopped. A temperature of 3 K below the maximum storage tank temperature must first be reached before charging can be resumed.
The following displays appear:
• The pump symbol does not move
The sun symbol is displayed
The "max" indication flashes in the storage tank symbol
•
•
7.3
Maximum collector temperature
During periods of high solar irradiance, the temperature (T1) of the heat transfer fluid can exceed 130 °C.
The heat transfer fluid evaporates. In this case, the pump is stopped for protection purposes until the temperature drops below 1 7 °C.
The following displays appear:
•
The pump symbol does not move
The sun symbol is displayed
The vapour symbol flashes
7.4
Tube collector function
Due to its construction, the collector temperature (T1) can only be inaccurately recorded with vacuum tube collectors (in some cases there are no immersion sensors; or the sensor is outside the collector pipe). In these cases, the solar circuit must be briefly activated
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EN at regular intervals to transmit the actual heat from the collector pipe to the sensor (T1). If the tube collector function is activated, the controller automatically switches the pump on every 30 minutes for 30 seconds. The following displayappears:
• The bottom temperature sensor, T1, is shown
7.5
Anti-freeze function
If the anti-freeze function is activated, the controller switches the pump on as soon as the collector temperature T1 falls below +5 °C. The heat transfer fluid is then pumped through the collector to prevent the system from freezing. If the collector reaches a temperature of +7 °C, the pump is switched off again.
CAUTION
System can freeze despite the activated anti-freeze function!
During a power outage, the anti-freeze function does not operate.
During long-term periods of frost (due to restricted water tank heat storage).
If collectors are mounted in locations exposed to wind.
It is recommended to generally use heat transfer fluid with anti-freeze for solar energy systems.
Standard anti-freeze heat transfer fluids for solar
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energy systems also contain an additional corrosion inhibitor.
The anti-freeze symbol appears and the display shows the following message.
7.6
Holiday function
The holiday function is used to cool down a completely heated storage tank again via the collector. The storage tank can heat up too much, e.g. if no hot water is extracted from the storage tank over an extended period of time (holiday) of intense solar irradiance.
A completely heated storage tank subjects the solar energy system to a higher thermal load.
If the holiday function is activated, the storage tank is cooled as follows: If the storage tank temperature rises to 10 K below the set maximum storage tank temperature, the controller attempts to discharge the lower section of the storage tank to 35 °C (e.g. at night). To do so, the pump is automatically switched on once the collector is 8 K colder than the storage tank. If the temperature difference between the collector and the storage tank is only 4 K, the pump is switched off again.
The following displayappears:
• The holiday symbol is displayed
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7.7
Flow test service function
The flow test service function is used to check the flow rate at maximum pump speed. The pump remains switched on at 100 % performance while the flow test service function is activated.
NOTE
A Grundfos Direct Sensors TM VFS 1-1 must be connected in order to use the flow test service function.
Safety limits (maximum collector temperature, maximum storage tank temperature) are not taken into account while the service function is active.
7.8
Speed control
The controller provides a PWM control signal for controlling the speed of an ECM pump; see PWM characteristics at the right (RPM = revolutions / minute).
PWM
100 %
NOTE
At the factory the controller is set to speed control
"on".
The speed control function controls the settings of the solar circuit pump.
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Speed control "oFF": Control signal as switched output
When switched on, the solar circuit pump runs at maximum speed (100 %) and delivers a constant volume flow.
Speed control "on": Control signal speed controlled
When switched on, the solar circuit pump runs at a controlled speed in the range of 30 ... 100 % and delivers a regulated volume flow.
The following display appears:
• The speed control symbol is displayed
The speed control function, however, makes a distinction between the "differential temperature control" and "absolute temperature control":
-
-
Differential temperature control "diF" :
The control system attempts to maintain a constant temperature difference between the collector and the storage tank. The solar circuit pump performance is continuously adjusted and the volume flow is increased or reduced, depending on the temperature difference. The specified temperature difference is fixed at 8 K.
Absolute temperature control "AbS“
The solar circuit pump is controlled in such a manner that the collector temperature sensor
T1 is kept at the absolute temperature as constantly as possible so that the storage tank can
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8 Operation
CAUTION
The incorrect operating mode may cause the system to shut down or impair proper functioning!
Make sure that the operating switch is set to automatic operation.
8.1
Setting the controller (main menu)
The main menu of the display shows the temperature values of the individual temperature sensors, the flow rate and the operating hours of the pump.
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8.1.1
Main menu overview
EN
Temperature sensor T1 with current temperature
Temperature sensor T2 with current temperature
If connected: Grundfos
Direct Sensors TM VFS 1-12 with current temperature
If connected: Grundfos
Direct Sensors TM VFS 1-12 with current flow rate
Operating hours of the pump
T1
T2
88
Press briefly
SET or automatically after 1 min.
Min/max temperature values are shown alternately on the display min
2 sec
SET max
End of display
Saved min/max values are deleted and set to the current temperature value
Reset
Press briefly
SET or automatically after 1 min.
min max
2 sec
SET
End of display
Reset
Press briefly
SET or automatically after 1 min.
min max
2 sec
SET
End of display
Reset
88
8
Press briefly
SET or automatically after 1 min.
max
2 sec
SET
End of display
Reset
Press briefly
SET or automatically after 1 min.
Operating hours
Display flashes
8 2 sec
SET
End of display
Operating hours are set to 0
0
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8.1.2
Displaying temperature values and flow rate
Use the buttons and to select the temperature sensor or flow rate sensor (T1, T , T Grundfos
Direct SensorsTM VFS 1-1 , Q Grundfos Direct
Sensors TM VFS 1-1 ).
The selected sensor and the current measured value are shown in the display.
NOTE
If a Grundfos Direct Sensors TM VFS 1-1 is not connected the displays T (temperature) and Q (flow rate) of the
Grundfos Direct Sensors TM VFS 1-1 are skipped.
The temperature Grundfos Direct Sensors TM VFS 1-1 is displayed in degrees Celsius without a sensor symbol and with a blinking solar circuit symbol.
The flow rate Grundfos Direct Sensors TM VFS 1-1 is displayed in physical units of [l/min] without a sensor symbol and with a blinking solar circuit symbol.
8.1.3
Displaying min / max temperature values
✓ Desired temperature sensor is selected.
Press the SET button briefly.
Min. / max. temperature values are shown alternately on the display .
To exit min/max temperature value settings, press
or button.
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8.1.4
Deleting min.
/ max.
temperature values
✓ Desired temperature sensor is selected.
Press the SET button briefly.
Min. / max. temperature values are shown alternately on the display.
Press the SET button for approx. seconds until the temperature values saved are deleted.
The min. / max. temperatures and the current measured temperature appear on the display.
To exit min. / max. temperature value settings, press or button.
8.1.5
Displaying max.
flow rate (only when a
Grundfos Direct Sensors TM VFS 1-12 is connected.)
✓ Flow rate is selected.
Press the SET button briefly.
The max. flow rate is shown on the display.
To exit the max. flow rate, press the or button.
8.1.6 Resetting the max.
flow rate (only when a
Grundfos Direct Sensors TM VFS 1-12 is connected.)
✓ Flow rate is selected.
Press the SET button briefly.
The max. flow rate is shown on the display.
Press the SET button for approx. seconds until the flow rate value saved is deleted.
The display now shows the current measured flow
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rate as the max. flow rate.
To exit the max. flow rate, press the or button.
8.1.7
Displaying the operating hours of the pump
Use the or button to select the operating hours of the pump.
The operating hours of the pump appear on the display.
8.1.8
Deleting the operating hours of the pump
✓ The operating hours of the pump are selected.
Press the SET button briefly.
The operating hours flash on the display .
Press the SET button for approx. seconds until the operating hours are set to "0".
The display shows "0" operating hours .
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8.2
Setting the controller (settings
°C menu)
8.2.1
Overview of settings menus °F
Main menu Temperature unit
2 sec
SET
Section 8.
.3
Tube collector function
D
2 sec
SET
°C
°F
T1
2 sec
SET °C
D
Section 8.
.4
Maximum storage
D
Section 8.
.5
Anti-freeze function
D
Section 8.
.6
T1
°C
2 sec
SET
60
°F
°F
°C
*
°C
°C
°C
°C
°C
°C
°C
2 sec
SET
Holiday function
D
.7
2 sec
SET
D
Speed control
Section 8.
.8
2 sec
60
60 °C
°C
°C
°C
SET
60
60
°C
°C
°C
°C
°C
°C
60
60
°C
°C
°C
°C
°C
°C
°C
°C
°C
°F or 2 sec
SET
°C
°C
°C
°C
°C
°C
°C
°F
°C
°C
°C
°C
°C
* Note:
All temperature values are sample values only
°C
°C
°F
60 °C
°C
°C
2 sec
SET
60 °C
°C
°C
*
°C
°C
°C
°C
°C
°C
°C
°F
°C
°F
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8.2.2
Using the settings menus
To open the settings menus, press the SET button for approx. seconds.
Settings menu "Temperature unit" is displayed.
To switch to the next settings menu, press the
button.
To exit the settings menus, press the button again until the temperature sensor and temperature reading (main menu) are shown again.
8.2.3
Selecting the temperature unit
✓ The settings menu is open.
✓
Temperature unit "°C" or "°F" flashes
Press the SET button for approx. seconds to toggle between "°C" and "°F".
To exit the settings menu, press the button again until the main menu appears.
8.2.4
Activating the tube collector function
NOTE
Incorrectly setting the controller can compromise the efficiency of the solar energy system. Therefore, only activate the tube collector function if the construction of the collector does not allow its temperature to be recorded immediately and/or accurately (in some cases there are no immersion sensors; the sensor is outside the collector pipe).
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✓
✓
The settings menu is open.
The Symbols for temperature sensor T1 and tube collector function flash.
Press the SET button for approx. seconds until top temperature sensor T1 is changed to bottom T1.
To exit the settings menu, press the button again until the main menu appears.
8.2.5
Setting the maximum storage tank temperature
DANGER
Risk of scalding due to storage tank temperature of over 60 °C!
Install a thermostatic mixer in the hot water pipe and set to maximum 60 °C.
✓
✓
The settings menu is open.
The Symbols for maximum storage tank temperature and temperature sensor T flash.
Press the SET button for approx. seconds until the temperature indicator flashes.
Change the maximum storage tank temperature using the or buttons.
To save the value, press the SET button.
To exit the settings menu, press the button again until the main menu appears.
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8.2.6
Activating the anti-freeze function
CAUTION
System can freeze despite the activated anti-freeze function!
During a power outage, the anti-freeze function does not operate.
During long-term periods of frost (due to restricted water tank heat storage).
If collectors are mounted in locations exposed to wind.
If frost is expected for a long period of time, only operate the system with anti-freeze heat transfer fluid for solar thermal systems.
For further information see section 7.5.
NOTE
Incorrectly setting the controller can compromise the efficiency of the solar energy system.
Only activate the anti-freeze function for solar energy systems that are not filled with anti-freeze.
✓
✓
The settings menu is open.
The symbol for anti-freeze function flashes.
Press the SET button for approx. seconds to toggle between "oFF" and "on".
To exit the settings menu, press the button again until the main menu appears.
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D
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8.2.7
Activating the holiday function
✓ The settings menu is open.
✓
The holiday function symbol flashes.
Press the SET button for approx. seconds to toggle between "oFF" and "on".
To exit the settings menu, press the button again until the main menu appears.
8.2.8
Activating the speed control
✓ The settings menu is open.
✓ The speed control symbol flashes.
Press the SET button for approx. seconds to toggle between "oFF" and "on".
Depending on the "oFF" or "on" setting, the following setting options are available:
The display shows "oFF":
To exit the settings menu, press the button. The main menu appears.
The display shows "on":
Press the button to access the settings menu in order to select speed control.
"diF" or "AbS" flashes on the display.
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The speed control function makes a distinction between the "absolute temperature control (AbS)" and "differential temperature control (diF)".
Press the SET button for approx. seconds to toggle between "AbS" and "diF".
Depending on the "AbS" or "diF" setting, the following setting options are available:
The display shows the setting "diF":
To exit the settings menu, press the button. The main menu appears.
The display shows the setting "AbS":
Press the button to set the temperature value.
Temperature and "AbS" flash alternately.
Press the SET button for approx. seconds until only the temperature indicator flashes.
Change the temperature using the or buttons.
To exit the settings menu, press the button. The main menu appears.
T1
T2
D
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8.2.9
Activating the flow test service function
The operation switch must be set to AUTO (middle position) in order to activate the flow test service function.
Press the and buttons simultaneously for seconds.
"on" and the current flow rate in [l/min] are displayed alternately.
Ending the flow test service function:
Briefly press the or buttons or the controller automatically exits back to automatic operation after
5 minutes.
NOTE
The flow test service function can only be activated when a Grundfos Direct Sensors TM VFS 1-1 is connected.
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9 Maintenance
The controller was conceived for years of continuous trouble-free operation. Nevertheless, faults may occur.
Maintenance may only be performed by professional personnel.
The fault is usually not in the controller but rather in the peripheral system components. The following description covers the most common problems encountered with the controller.
Only send in the controller, with a precise fault description, if none of the following faults are present.
9.1
Causes of problems
WARNING
Risk of death by electrocution!
Disconnect the controller from the power supply before opening the casing.
Controller does not appear to function at all.
Secondary symptoms Possible cause / remedy
• The controller display is blank
No power supply present
Have professional personnel check the fuse and the supply cable.
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The pump, which is connected to the controller, is not running, although its switch-on conditions have been fulfilled.
Possible cause / remedy Secondary symptoms
• The pump symbol rotates in the display
•
Pump connection cables not connected or interrupted.
Have professional personnel check the cables.
Storage tank full
•
•
•
•
•
•
The pump symbol does not rotate
"max" in the tank symbol blinks
The pump symbol does not rotate
Symbol for evaporating collector fluid flashes
The pump symbol does not rotate
Display is lit with a red background
OFF flashes
Collector fluid evaporates
Operating switch is set to
"Off"
Use the operating switch to set the controller to automatic operation.
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Short-circuit symbol and warning sign appear.
Secondary symptoms Possible cause / remedy
•
•
•
The pump symbol does not rotate
Display background alternately flashes red and yellow
Pump stops in the case of a short-circuit
(only applies to T1 or T )
NOTE
Short-circuit in the temperature sensor or its supply cable
Have professional personnel check the temperature sensor supply cable and the connections to the controller.
The pump does not stop running in the case of a shortcircuit in the Grundfos Direct Sensors TM VFS 1-1 T or Q.
Interruption symbol and warning sign appear.
Secondary symptoms Possible cause / remedy
•
•
•
•
The pump symbol does not rotate
Display background alternately flashes red and yellow
Sun symbol goes out
Pump stops in the case of an interruption
(only applies to T1 or
T )
Temperature sensor T1 or T or its supply cable is interrupted
Have professional personnel check the temperature sensor supply cable and the connections to the controller.
!
!
Short-circuit and warning sign
(example)
!
!
Interruption and warning sign
(example)
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!
SYS-display and warning sign (example)
EN
NOTE
The pump does not stop running in the case of an interruption in the Grundfos Direct Sensors TM VFS 1-1
T or Q.
"SYS" and the warning sign flash in the controller display.
Possible cause / remedy
SYS means there is a system error. This means that despite the pump running, a temperature difference exceeding 80 K between the collector and the storage tank was recorded.
The following causes are possible:
• The pump is faulty or not correctly connected
• The isolating valve in the solar circuit is closed
• Air is in the solar circuit.
Since a standard circulation pump cannot eliminate air bubbles inside the piping system, the heat transfer medium circuit comes to a standstill.
Have professional personnel check the solar energy system to prevent damage.
Once the fault has been remedied, press any button to acknowledge the fault message.
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9.2
Testing the temperature sensor
9.2.1
Safety
Only professional personnel may test the temperature sensor.
9.2.2
Testing the resistance values
DANGER
Risk of death by electrocution!
Disconnect the controller from the power supply before opening the casing.
The temperature is recorded by type Pt1000 resistance sensors. The resistance value of the sensor changes depending on the temperature. A potentially defective sensor can be checked using an ohmmeter.
Measuring resistance values
Disconnect the corresponding temperature sensor from the controller.
Measure the resistance value. The typical resistance values, depending on the temperature, are listed in the following table. Please note that small deviations are permissible.
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Temperature sensor resistance values
Temperature [°C]
Resistance [Ω]
-30 0 -10 0
88 9
10 0
961 1000 1039 1078
Temperature [°C]
Resistance [Ω]
Temperature [°C]
Resistance [Ω]
Temperature [°C]
Resistance [Ω]
30 40 50 60 70 80
1117 1155 1194 1 3 1 71 1309
90 100 110 1 0 130 140
1347 1385 14 3 1461 1498 1536
150 160 170 180
1573 1611 1648 1685
10 Dismantling and disposal
DANGER
Risk of death by electrocution!
Disconnect the controller from the power supply before dismantling it.
To dismantle the controller, follow the installation instructions in the reverse order.
Dispose of the controller in accordance with the local regulations.
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11 Legal guarantee
In accordance with German statutory regulations, there is a -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
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Any further claims against the seller based on this 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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12 Technical data
Temperature difference controller
Operational voltage
Controller's own consumption
30 V~ (+/– 15 %), 50 Hz
≤ 1 W
Inputs
Output
x temperature recording (Pt1000)
1 x Grundfos Direct Sensors TM VFS 1-1 input
(flow rate and temperature)
R1: Triac switched output for permanently supplying power to the ECM pump
C: PWM control signal for pump speed:
8 mA, 5 V, 50 Hz
Characteristic curve:
0 % PWM = pump off
100 % PWM = maximum speed
Switch-on temperature difference 8 K
Switch-off temperature difference 4 K
Display LCD display
Degree of protection
Permitted ambient temperature
Installation
Weight
IP 0 / DIN 40050
0 °C to +45 °C
Wall mounting
50 g
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Casing
Dimensions L x W x H [mm]
Temperature sensors
Fuse recyclable 3-piece plastic casing
137 x 134 x 38
Pt1000, silicone cable, 1.5 m
(measuring range up to +180 °C)
1.6 AT, 3.9 A²s
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