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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738.955 | 10.40
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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
T1T1T1T1
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
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