Steca TR A301 Installation And Operating Instructions Manual

SOLARTHERMIE - SOLAR THERMAL SYSTEMS - SOLAR TÉRMICO - SOLAIRE THERMIQUE - SOLARE TERMICO
Installation and operating instructions
Temperature difference controller
3 inputs, 1 PWM control signal for an ECM pump
738.955 | Z01 | 10.40 | Subject to change due to technical improvements!
EN
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.
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Inhalt
1 About these instructions .......... 3
1.1 Applicability .................................3
1.2 Users ............................................3
1.3
Description of symbols ................4
2 Safety ........................................
5
2
.1 Proper usage ...............................5
2
.2 Improper usage ...........................
5
2.3 Da
ngers during assembly /
commissioning .
...
.............................6
2.4 Detecting faults ...........................7
2.5 Exclusion of liability .....................
7
3 Description ................................ 9
3.1
Controller in the solar circuit .......9
3.2 Casing overview .........................10
4 Installation ............................. 11
4.1 Opening / closing the casing ......
11
4.2 Installation
.................................1
2
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 .............. 20
7.
2 Maximum storage tank
temperature ..............................20
7.3
Max
imum collector temperature .21
7.4 Tube collector function .............. 2
1
7.5 Anti-freeze function ...................22
7.6 Holiday function ........................2
3
7.7
Flow test service function .......... 24
7.8 Speed control ............................2
4
8 Operation ................................
26
8.1
Set
ting the controller (main menu) 26
8.2 Setting the controller (settings
menu)
........................................31
9 Maintenance ........................... 38
9.1 Causes of problems ...................38
9.2 Tes
ting the temperature sensor ....
42
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 fami
liar 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 leve
ls in warning notices
Danger level Likelihood of
occurrence
Consequences resulting from non-compliance
DANGER
Imminent threat of danger
Death, serious bodily injury
WARNING
Possible threat of danger
Death, serious bodily injury
CAUTION
Possible threat of danger
Minor bodily injury
CAUTION Possible
threat of danger
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 Meaning
Condition for action
Call to action Result of action
List
Emphasis on issue
at hand
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 condi­tion
s (see section 12 "Technical data").
2.2 Improper usag
e
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 sect
ion 12).
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 f
aul
ts
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 o
f lia
bility
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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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 difference controller
Storage tank
ECM pump
Temperature sensor 1 (collector sensor)
Temperature sensor 2 (lower area of storage tank)
Collector
T1
T2
Solar circuit
V
Optional: Grundfos Direct Sensors
TM
VFS 1-12
T
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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 (T2). 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
Auto
On
Off
Operating buttons Arrow up SET button Arrow down
Display
Display for controller operation and system settings
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
Connections
grid, pump, temperature sensors
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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 cas-
ing has been closed.
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 ca
sing
Loosen the screw and remove the upper casing in an upwards direction.
4.1.2 Closing the ca
sing
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.
Hinge grooves
Operating buttons
Upper casing
Lower casing
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 co
ntroller
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.
         
105
1
137,2
3
2
116 134
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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 ca
ble 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 cab
le through the lower side of
the casing (fig. 2):
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 ca
bles
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.
-
SET
6
Fig. 2: cable feed from below
SET
7
Fig. 1: cable feed from the rear
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Each terminal may only be connected to a single connecting wire (max 2.5 mm2).
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 wire
s must be twisted with 1 twist per 20 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 n
ot lay sensor cables close to 230 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
radi
o stations, microwave devices etc. , then the sensor cables must be adequately shielded. Sensor cables may be extended to a maximum leng
th of 100 m. For extension cables, select the following cable cross sections:
0.75 mm
2
up to 50 m long
1.5 mm
2
up to 100 m long Connect the cables in accordance with the terminal plan. Use only the Grundfos Direct Sensor
TM
VFS 1-12
that is approved for the controller.
-
-
-
-
-
-
-
-
-
-
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L NN R1 C T1 T2
4.3.3 Terminal plan
Protective
conductor
PWM control signal
for ECM pump
Temperature sensor 1
(collector)
Grid
230 V~
Power supply for the ECM
pump
230 V~
ATTENTION: Voltage always
present!
Temp
erature sensor 2
(lower area of storage tank)
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.
Optional: Grundfos Direct SensorsTM VFS 1-12
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5 Display overview
2
°
E
D
T1 T1
T2
!
min
T1
max
max
ºC
ºF
1
Temperature sensor symbols
Top T1 = collector sensor Bottom T1 = sensor for tube collector function T2 = sensor for lower area of storage tank
2
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
6
Tube collector function
7
Setting the temperature unit °C / °F
8
Speed control
9
Holiday function (see page 35)
10
Anti-freeze function (see page 34)
11
Symbols for pump operation and
heat transfer fluid circulation
12
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
15
Display when the switch-on tem-
perature difference is reached, means "sufficient heat available"
15
14
13 12
11
1
9
3
4
810
5
6
7
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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 sec-
onds 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 sec-
onds off flashes in alternation with the display.
 
 
 
T1
T2
on
T1
T2
on
T1 T1
T2
off
T1 T1
T2
off
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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.
T1
Auto
T1
Auto
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7 Description of the controller
functions
7.1 Switch-on / switch-off temperature dif-
ference
The controller constantly compares the temperatures between the collector (T1) and the lower area of the stor
age tank (T2). As soon as the temperature in the
collector (T1) is 8 K (constant fixed value) higher than the temperature in the storage tank (T2), 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 stor
age tank temperature
The maximum storage tank temperature function is to prevent the hot water tank from overheating. If the
T2T2
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lower area of the storage tank (T2) 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 coll
ector 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 temp
erature drops below 127 °C.
The following displays appear:
The pump symbol does not move The sun symbol is displayed The vapour symbol flashes
7.4 Tube coll
ector 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
T2
maxT2max
T1T1
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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 func
tion
If the anti-freeze function is activated, the controller switches the pump on as soon as the collector tem­pera
ture 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
T1T1T1 T1
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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 func
tion
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 rise
s 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
DT1D
T1
T1T1
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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 1-12 must be con-
nected 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 cont
rol
The controller provides a PWM control signal for con­trolling the speed of an ECM pump; see PWM charac­teristics at the right (RPM =
revolutions / minute).
NOTE
At the factory the controller is set to speed control "on".
The speed control function controls the settings of the solar circuit pump.
100 %
100 %
0 %
PWM
rpm
100 %
100 %
0 %
PWM
rpm
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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.
Spee
d 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":
Diff
erential 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.
Abso
lute 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
-
-
T1T1
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be charged with the absolute temperature. The desired absolute temperature can be entered in the setup.
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 co
ntroller (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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Press briefly
SET
2 sec
SET
or automatically after 1 min.
8.1.1 Main menu overview
Temperature sensor T1 with current tempera­ture
T1
Press briefly
Operating hours of the pump
2 sec
Min/max temperature values are shown alter­nately on the display
Saved min/max values are deleted and set to the current tempera­ture value
Temperature sensor T2 with current temperature
If connected: Grundfos Direct Sensors
TM
VFS 1-12
with current flow rate
End of display
Reset
or automatically after 1 min.
Operating hours are set to 0
88
T2
8
0
Operating hours Display flashes
min
max
SET
SET
Press briefly
2 sec
End of display
Reset
or automatically after 1 min.
min
max
SET
SET
Press briefly
2 sec
End of display
Reset
or automatically after 1 min.
min
max
SET
SET
Press briefly
SET
2 sec
SET
or automatically after 1 min.
88
If connected: Grundfos Direct SensorsTM VFS 1-12 with current temperature
max
Reset
8
End of display
End of display
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8.1.2 Displaying temperature values and flow rate
Use the buttons
and  to select the tempera-
ture sensor or flow rate sensor (T1, T2, T Grundfos Direct SensorsTM VFS 1-12 , Q Grundfos Direct Sensors
TM
VFS 1-12).
The selected sensor and the current measured value are shown in the display.
NOTE
If a Grundfos Direct SensorsTM VFS 1-12 is not connected the displays T (temperature) and Q (flow rate) of the Grundfos Direct SensorsTM VFS 1-12 are skipped.
The temperature Grundfos Direct Sensors
TM
VFS 1-12 is
displayed in degrees Celsius without a sensor symbol and with a blinking solar circuit symbol.
The flow rate Grundfos Direct Sensors
TM
VFS 1-12 is
displayed in physical units of [l/min] without a sensor symbol and with a blinking solar circuit symbol.
8.1.3 Displaying min / ma
x 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.
 
T1T1
T1T1T1
T1
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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. 2 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. f
low rate (only when a
Grundfos Direct SensorsTM 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  but-
ton.
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. 2 seconds until the
flow rate value saved is deleted.
The display now shows the current measured flow
 
  
  
T1T1T1
T1T1T1T1
T1
8888
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rate as the max. flow rate.
To exit the max. flow rate, press the
or
but-
ton.
8.1.7 Displaying the op
erating 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 op
erating 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. 2 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 menu)
8.2.1 Overview of settings menus
Temperature unit
Section 8.2.3
SET
Maximum storage tank temperature
Section 8.2.5
2 sec
SET
Anti-freeze function
D
Section 8.2.6
2 sec
SET
Holiday function
Section 8.2.7
2 sec
SET
Speed control
Section 8.2.8
2 sec
SET
Main menu
2 sec
SET
2 sec
SET
Tube collector function
Section 8.2.4
T1
T1
SET
SET
or
2 sec
SET
SET
2 sec
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
°F
°C
2 sec
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
* Note: All temperature values are sample values only
*
*
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8.2.2 Using the settings menus
To open the settings menus, press the
SET
button
for approx. 2 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 te
mperature unit
The settings menu is open. Temperature unit "°C" or "°F" flashes Press the
SET
button for approx. 2 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 tu
be 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).
DD
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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. 2 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 tem-
perature
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 tempera-
ture
and temperature sensor T2 flash.
Press the
SET
button for approx. 2 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.
 
D
T1 T1
T2
D
T1 T1
T2
D
T2
max
D
T2
max
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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. 2 seconds to
toggle between "oFF" and "on". To exit the settings menu, press the
button
again until the main menu appears.
DD
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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. 2 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 sp
eed control
The settings menu is open. The speed control symbol flashes. Press the
SET
button for approx. 2 seconds to tog-
gle 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.
 
 
DD
D
D
D
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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. 2 seconds to tog-
gle 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. 2 seconds until
only the temperature indicator flashes. Change the temperature using the
or  but-
tons. To exit the settings menu, press the
button. The
main menu appears.
 
 
DT1D
T1
D
T1
D
T1
D
T1
D
T1
D
T1
T2
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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 2
seconds.
"on" and the current flow rate in [l/min] are displayed alternately.
Ending the flo
w 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 SensorsTM VFS 1-12 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 pro
blems
WARNING
Risk of death by electrocution!
Disconnect the controller from the power supply before opening the casing.
Cont
roller 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.
Secondary symptoms
Possible cause / remedy
The pump symbol rotates in the display
Pump connection cables not connected or interrupted.
Have professional person­nel check the cables.
The pump symbol does not rotate
"max" in the tank symbol blinks
Storage tank full
The pump symbol does not rotate
Symbol for evapo­rating collector fluid flashes
Collector fluid evaporates
The pump symbol does not rotate
Display is lit with a red background
OFF flashes
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 o
r T2)
Short-circuit in the tem­perature sensor or its sup­ply cable
H
ave professional per­sonnel check the tem­perature sensor supply cable and the connec­tions to the controller.
NOTE
The pump does not stop running in the case of a short­circuit in the Grundfos Direct SensorsTM VFS 1-12 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 T2)
Temperature sensor T1 or T
2 or its supply cable
is interrupted
Ha
ve professional personnel check the temperature sensor supply cable and the connections to the controller.
T1
!
Short-circuit and warning sign (example)
T1
!
Short-circuit and warning sign (example)
T1
!
Interruption and warning sign (example)
T1
!
Interruption and warning sign (example)
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NOTE
The pump does not stop running in the case of an interruption in the Grundfos Direct Sensors
TM
VFS 1-12
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 elimi-
nate 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.
!
SYS-display and warning sign (example)
!
SYS-display and warning sign (example)
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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 t
he re
sistance 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 resi
stance 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] -30 -20 -10 0 10 20 Resistance [Ω] 882 922 961 1000
1039 1078
Temperature [°C] 30 40 50 60 70 80 Resistance [Ω] 1117 1155 1194 1
232 1
271 1309
Temperature [°C] 90 100 110 120 130
140
Resistance [Ω] 1347 1385 1423 1461
1498 1536
Temperature [°C] 150 160 170 180 Resistance [Ω] 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 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 se
ller 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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in value caused by the fault shall be replaced, or, if this is not sufficiently taking the interests of the end cus­tomer into consideration, the contract is cancelled.
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 230 V~ (+/– 15 %), 50 Hz Controller's own consumption ≤ 1 W Inputs 2
x temperature recording (Pt1000)
1 x
Grundfos Direct Sensors
TM
VFS 1-12 input
(flow rate and temperature)
Output R1: Triac switched output for permanently
supplying power to the ECM pump
C: PWM control signal for pump speed:
8
mA, 5 V, 250 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 IP
20 / DIN 40050
Permitted ambient temperature
0 °C to +45 °C
Installation Wall mounting Weight 2
50 g
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Casing recyclable 3-piece plastic casing Dimensions L x W x H [mm] 137 x 134 x 38 Temperature sensors Pt1000, silicone cable, 1.5 m
(measuring range up to +180 °C)
Fuse 1.6 AT, 3.9 A²s
738955
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