Sorel MTDC User manual

Temperature difference controller MTDC
Installation and operating instructions
Read carefully before installation, commissioning and operation

CONTENT
Safety Instructions 4
EU-Conformity 4
General instructions 4
Explanation of Symbols 4
Changes to the Unit 5
Warranty and Liability 5
Disposal and Pollutants 5
Description MTDC 5
About the Controller 5
Specifications 6
Scope of Supply 6
Hydraulic Variants 7
Installation 9
Electrical Terminals 9
Wall Installation 10
Electrical Connection 11
Installing the Temperature Sensors 11
Temperature Resistance Table for Pt1000 Sensors 11
Operation 12
Display and Input 12
Commissioning help 13
1. Measurement values 13
2. Statistics 14
Operating hours 14
Heat quantity 14
Graphic overview 14
Notifications 14
Reset / Clear 14
3. Operating mode 15
Auto 15
Manual 15
Off 15
4. Settings 16
Tmin S1 16
Priority Storage X 16
ΔT Solar S(X) 16
Tmax S2 16
Tmin Storage X 16
Tmax Pool / Tmax Pool HE 17
Priority temperature 17
Loading time 17
Increase 17
5. Protective Functions 17
System protection 17
Collector protection 17
Recooling 18
Frost Protection 18
Seizing Protection 18
Collector alarm 18
6. Special Functions 18
Program selection 18
Pump settings 18
Profile 18
Signal type 19
Output Signal 19
PWM / 0-10V off 19
PWM / 0-10V on 19
PWM / 0-10V max. 19
Show signal 19
Speed control 19
Variant 19
Purging time 19
Sweep time 19
Max. Speed 19
Min. Speed 20
Setpoint 20
Setpoint ΔT 20
Relay functions 20
Solar bypass 20
Solar bypass 20
Variant 20
Bypass sensor 20
Thermostat 20
DHW request 21
Heating Circuit request 21
Tset 21
Hysteresis 21
Thermostat sensor 1 21
Thermostat sensor 2 21
Teco 21
Energy Saving Mode 21
Thermostat enable 21
Thermostat 2 21
Cooling 21
Tset 21
Hysteresis 22
Cooling sensor 22
Periods 22
Return flow increase 22
Return flow increase 22
Return flow increase Tmax 22
ΔT return flow 22
Return flow sensor 22
Storage sensor 22
Field cooling 22
Tmax field 22
Hys min 22
Hys max 22
Field cooling sensor 22
Anti Legionella 22
Heat transfer 23
Heat transfer 23
HT Tmin 23
Δ T Heat transfer 23
HT Tmax 23
Source 23
Drain 23
Difference 24
Difference 24
Tmin Source 24
Δ T Difference 24
Tmax Drain 24
DF-Source 24
DF-Drain 24
Solid fuel boiler 25
Solid fuel boiler 25
Solid fuel boiler Tmin 25
ΔT Solid fuel boiler 25
Solid fuel boiler Tmax 25
Boiler sensor of this function 25
Storage sensor 25
Error Messages 26
Pressure monitor 26
Pressure monitor 26
RPS-Type 26
RPS Min 26
RPS Max 26
Booster Pump 26
Booster Pump 26
Charge time 26
Parallel operation R1/R2 26
Parallel operation 26

Delay 26
Follow-up time 26
Always on 26
Heating circuit 27
Heating circuit 27
Room Reference (Day) 27
Room Reference (Night) 27
Room 27
Periods 27
Heat quantity 27
Flow temperature sensor (X) 27
Return flow sensor 27
Glycol type 27
Glycol percentage 27
Flow rate supply flow (X) 27
Offset ∆T 27
Sensor Calibration 28
Commissioning 28
Factory Settings 28
Starting aid 28
Purging time 28
Increase 28
Time & Date 28
Daylight saving time 28
Eco Display Mode 28
Temperature unit 29
Network 29
Access Control 29
Ethernet 29
Sensor send interval 29
7. Menu Lock 30
8. Service Values 30
9. Language 30
Malfunctions/Maintenance 31
Additional Information 32
CAN bus 32
Tips 32
Final Declaration 33

Safety Instructions
EU-Conformity
By affixing the CE mark to the unit the manufacturer declares that theMTDC conforms to the following relevant safety regulations:
lEU low voltage directive 2014/35/EU
lEU electromagnetic compatibility directive 2014/30/EU
conforms. Conformity has been verified and the corresponding documentation and the EU declaration of conformity are kept on file by
the manufacturer.
General instructions
Please read carefully!
These installation and operating instructions contain basic instructions and important information regarding safety, installation, com-
missioning, maintenance and the optimal use of the unit. Therefore these instructions must be read and understood completely by the
installation technician/specialist and by the system user before installation, commissioning and operation of the unit.
This unit is an automatic, electrical Temperature difference controller. Install the unit only in dry areas and under the ambient conditions
described in “Specifications”.
The valid accident prevention regulations, VDE regulations, the regulations of the local power utility, the applicable DIN-EN standards
and the installation and operating instruction of the additional system components must also be observed.
Under no circumstances does the unit replace any safety devices to be provided by the customer!
Installation, electrical connection, commissioning and maintenance of the device may only be carried out by an appropriately trained
specialist. Users: Make sure that the specialist gives you detailed information on the function and operation of the unit. Always keep
these instructions in the vicinity of the unit.
The manufacturer does not take over any liability for damage caused through improper usage or non-compliance of this manual!
Explanation of Symbols
Danger
Failure to observe these instructions can result in electrocution.
Danger
Failure to observe these instructions can result in serious damage to health such as scalding or life-threatening injur-
ies.
Caution
Failure to observe these instructions can result in destruction of the unit or the system, or environmental damage.
Caution
Information which is especially importation for the function and optimal use of the unit and the system.
4

Changes to the Unit
lChanges, additions to or conversion of the unit are not permitted without written permission from the manufacturer.
lIt is likewise forbidden to install additional components that have not been tested together with the unit.
lIf it becomes clear that safe operation of the unit is no longer possible, for example because of damage to the housing, turn the
Unit off immediately.
lAny parts of the unit or accessories that are not in perfect condition must be exchanged immediately.
lUse only original spare parts and accessories from the manufacturer.
lMarkings made on the unit at the factory must not be altered, removed or made illegible.
lOnly the settings described in these instructions may be set using the Unit.
Changes to the unit can compromise the safety and function of the unit or the entire system.
Warranty and Liability
The unit has been manufactured and tested with regard to high quality and safety requirements. The unit is subject to the statutory
guarantee period of two years from the date of sale. The warranty and liability shall not include, however, any injury to persons or
material damage that is attributable to one or more of the following causes:
lFailure to observe these installation and operating instructions.
lImproper installation, commissioning, maintenance and operation.
lImproperly executed repairs.
lUnauthorised structural changes to the unit.
lUse of the device for other than its intended purpose.
lOperation above or below the limit values listed in the ‚Specifi cations‘ section.
lForce majeure.
Disposal and Pollutants
The unit conforms to the European RoHS 2011/65/EU for 2011/65/EUthe restriction of the use of certain hazardous substances in elec-
trical and electronic equipment.
Under no circumstances may the device be disposed of with the normal household waste. Dispose of the unit only at appro-
priate collection points or ship it back to the seller or manufacturer.
Description MTDC
About the Controller
The Temperature difference controller MTDC facilitates efficient use and function control of your solar or heating system possible
while its handling is intuitive. After every input step the suitable functions are matched to the keys and explained in a text above. In the
menu 'measurement values and settings' are help text and graphics in addition to key words.
The MTDC can be used with different variants of installations, See " Hydraulic Variants " on page 7.
Important characteristics of the MTDC are:
lDepiction of graphics and texts using a lit display.
lSimple viewing of the current measurement values.
lStatistics and system monitoring by means of statistical graphics
lExtensive setting menus with explanations.
lMenu block can be activated to prevent unintentional setting changes.
lResetting to previously selected values or factory settings.
5

Specifications
Electrical specifications:
Power supply 100 - 240VAC, 50 - 60 Hz
Power consumption / standby 0,5W - 2,5W/ X
Internal fuse 1 2A slow blow 250V
Protection Class IP40
Protection Class II
Overvoltage category II
Degree of pollution category II
Inputs/Outputs
Sensor inputs 4 Pt1000 -40 °C ... 300 °C
Outputs mechanical relay 2
mechanical relay R1-R2 460VA for AC1 / 460VA for AC3
0-10V/PWM output V1 for 10 k Ω working resistance 1 kHz, level 10 V
Max. cable length
Collector sensor S1 < 30 m
CAN < 3 m; at >= 3 m, a shielded twisted pair cable must be used. Isolate
shielding and connect it to the protective conductor of only one of the
devices. Max. cable length of the complete system 200 m.
0-10V/PWM < 3 m
mechanical relay < 10 m
Interface
Fieldbus CAN
Permissible Ambient Conditions
for controller operation 0 °C - 40 °C, max. 85 % rel. humidity at 25 °C
for transport/storage 0 °C - 60 °C, no moisture condensation permitted
Other Specifications and Dimensions
Housing Design 2-part, ABS plastic
Installation Methods Wall installation, optionally panel installation
Overall dimensions 163 mm x 110 mm x 52 mm
Aperture installation dimen-
sions
157 mm x 106 mm x 31 mm
Display Fully graphical display, 128 x 64 dots
Light diode multicolour
Real Time Clock RTC with 24 hour power reserve
Operation 4 entry keys
Scope of Supply
lTemperature difference controllerMTDC
l3 screws 3,5 x 35 mm and 3 plugs 6 mm for wall installation.
lMTDC Installation and operating instructions
Optionally contained depending on design/order:
lCAN Bus Accessories: Datalogger with Ethernet connection
lExternal relay for V1: 77502
6

Hydraulic Variants
The following illustrations should be regarded only as schematic representations of the respective hydraulic systems and do not claim to be complete. Under no cir-
cumstances should the controller replace any safety devices. Depending on the specific application, additional system and safety components such as check
valves, non-return valves, safety temperature limiters, scalding protectors, etc., may be required.
For 3-way valves, the flow direction in energized state (relay active) is shown in the used hydraulic version.
Solar with storage Solar with pool Solid fuel boiler with storage
Storage transfer Heating circuit return flow increase Thermostat
Universal Delta T Shutoff valve Solar with pool and heat exchanger
Solar with thermostat (auxiliary heat-
ing)
Solar with two-zone storage Solar with heating circuit
Solar with bypass Solar with heat exchanger Solar with 2 collector surfaces
7

Solar with 2 collector surfaces and 2
pumps
Solar with 2 storages and switching
valve
Solar with 2 storages and 2 pumps
Solar with storage transfer Solar with pool and heat exchanger Solar with thermostat and switching valve
Solar and solid-fuel boiler Solar with cooling 1 (collector cooling) Solar with cooling 2 (collector cooling)
Solar with cooling 3 (collector cool-
ing)
Solar with storage and solid-fuel boiler
and S4
2x Solar
8

Installation
Electrical Terminals
Low voltages
max. 12 VAC / DC
Mains voltages
230 VAC 50 - 60 Hz
On the control board
CAN CAN bus connection 1= high 2= low
CAN CAN bus connection 1= high 2= low
Terminal: Connection for:
S1 Temperature Sensor 1
S1 (GND)
S2 Temperature Sensor 2
S2 (GND)
S3 Temperature Sensor 3
S3 (GND)
V1 0-10V / PWM signal output e.g. for controlling high-
efficiency pumps
- speed controlled output for 0-10V GND/ PWM
high-efficiency pumps
S4 Temperature Sensor 4
S4 (GND)
Terminal: Connection for:
N Neutral conductor R1
R1 Outer conductor R1
N Neutral conductor main
L Outer conductor main
N Neutral conductor R2
R2 Outer conductor R2
The PE protective conductor must be connected to the PE
metal terminal block!
In high-efficiency pumps with 0-10V / PWM signal input, the
power supply must go through the corresponding relay (V1 ->
R1, R2 -> V2), because the relay turns on and off together
with the control signals.
"Connection of PWM pumps"
PWM pumps are connected to the controller with 2 wires 1) PWM Input (default: brown) 2) GND (default: blue). Some
pumps have a third wire (PWM Output Signal (default: black)). This is not used for the connection!
9

Wall Installation
1. Unscrew cover screw completely.
2. Carefully pull upper part of housing from lower part.
During the removal, the brackets are released as
well.
3. Set upper part of housing aside. Do not touch the
electronics.
4. Hold the lower part of the housing in the selected pos-
ition and mark the 3 mounting holes. Make sure that
the wall surface is as even as possible so that the
housing does not become distorted when screwed
on.
5. Using a drill and size 6 bit, drill three holes at the
points marked on the wall and push in the plugs.
6. Insert the upper screw and screw it in lightly.
7. Fit the upper part of the housing and insert the other
two screws.
8. Align the housing and tighten the three screws.
1. Open the terminal cover.
2. Strip lines a max. of 55 mm, assemble the strain
reliefs, strip wire ends 8-9 mm (Figure 1)
3. Open the terminals with a fitting screwdriver (figure 2)
and connect the electrical system to the controller.
4. Clip on the terminal cover again and close it with the
screw.
5. Turn on mains supply and put the controller into oper-
ation.
If problems occur with the operation of the terminals, our video on our YouTube page can help you:
http://www.sorel.de/youtube
10

Electrical Connection
Before working on the unit, switch off the power supply and secure it against being switched on again! Check that there is
no power flowing! Electrical connections may only be made by a specialist and in compliance with the applicable reg-
ulations. The unit may not be put into operation if there is visible damage to the housing, e.g. cracks.
The unit may not be accessible from behind.
Low-voltage cables such as temperature sensor cables must be routed separately from mains voltage cables. Feed tem-
perature sensor cables only into the left-hand side of the unit, and mains voltage cables only into the right-hand side.
The customer must provide an all-pole disconnecting device, e.g. an emergency heating switch.
The cables being connected to the unit must not be stripped by more than 55 mm, and the cable jacket must reach into the
housing just to the other side of the strain relief.
Installing the Temperature Sensors
The controller operates with Pt1000 temperature sensors which are accurate to 1 °C, ensuring optimal control of system functions.
If desired, the sensor cables can be extended to a maximum of 30 m using a cable with a cross-section of at least 0.75
mm². Ensure there is no contact resistance! Position the sensor precisely in the area to be measured! Only use immer-
sion, pipe-mounted or flat-mounted sensors suitable for the specific area of application with the appropriate permissible
temperature range.
Temperature Resistance Table for Pt1000 Sensors
°C -20 -10 0 10 20 30 40 50 60 70 80 90 100
Ω 922 961 1000 1039 1077 1116 1155 1194 1232 1270 1308 1347 1385
11

Operation
Display and Input
Pump (rotates when active)
Valve (direction of flow black)
Collector
Storage / buffer
Solid fuel boiler
Pool
Thermostat On/Off
Temperature Sensors
heat exchanger
External thermostat off
Further symbols can be found in the special functions
Examples for key settings:
+/- Increase / decrease values
▼/▲ Scroll menu down / up
Yes/No agree / reject
About further information
Back to the previous display
Ok Confirm selection
Confirm Confirm setting
The display‘s (1), extensive text and graphical mode, enables
simple, almost self-explanatory, operation of the controller.
The LED (2) lights up green when the primary pump is switched on
(automatic mode). The LED (2) lights up red when operating mode
‚Off‘ is set. The LED (2) flashes quickly red when an error is
present.
The function of the other 3 keys (4) is shown in the display right
above the keys. The right-hand key generally has a confirmation
and selection function.
The graphics mode appears if not key is pressed for 2 minutes or
after exiting the main menu with ‘esc’.
Hitting the "esc" key in the graphics mode takes you directly to the
main menu.
12

Commissioning help
1. Set language and time
2. Commissioning help / setup wizard
a) select or
b) skip.
The setup wizard guides through the necessary basic settings in the correct
order. Every parameter is explained on the display of the controller. Pressing
the „esc“ key takes you back to the previous setting.
b) With free commissioning the settings should be made in the following order:
lMenu 9. Language
lmenu 3. Operating hours
lmenu 4. Settings, all values
lmenu 5. Protection Functions (if any adjustments necessary).
lmenu 6. Special Functions (if any adjustments necessary).
3. In Menu operating mode “Manual”, test the switch outputs with the con-
sumers connected and check the sensor values for plausibility. Then set to
automatic mode.See " Manual " on page 15
The setup wizard can be accessed in menu 6.8. at any time.
Consider the explanations for the individual parameters on the following pages and check if further settings are necessary
for your application.
1. Measurement values
Serve to display the current measured temperatures.
If ‚error‘ appears on the display instead of the measurement value,
there may be a defective or incorrect temperature sensor.
If the cables are too long or the sensors are not well-placed, small
deviations in the measurement values may occur. In this case, the
display values can be compensated by adjustments in the controller
See " Sensor Calibration " on page 28. The selected program, con-
nected sensors and the specific model design determine which
measurement values are displayed.
13

2. Statistics
Serve for function control and long-term monitoring of the system.
For time-dependent functions such as circulation and anti-legionella
and the evaluation of system data, it is essential that the time is accur-
ately set on the controller. Please note that the clock continues to run
for about 24 hours if the mains voltage is interrupted, and afterward
must be reset. Improper operation or an incorrect time may result in
data being cleared, recorded incorrectly or overwritten. The man-
ufacturer accepts no liability for the recorded data!
Operating hours
Display of the operating hours of the consumers connected to the controller (for example, solar pumps, valves etc.) whereby different
time ranges (day-years) are available!
Heat quantity
Display of the consumed heat quantity form the system in kWh.
This is an indicative value.
Graphic overview
This results in a clear illustration of the data as a bar graph. Different time ranges are available for comparison. You can page through
with the two left keys.
Notifications
Display of the last 20 errors in the system with indication of date and time.
Reset / Clear
Resetting and clearing the selected statistics. Selecting ‚all statistics‘ clears everything except the messages.
14

3. Operating mode
Auto
The automatic mode is the normal mode of the controller. A correct controller function under consideration of the current temperatures
and the set parameters is only present in automatic mode! After an interruption of the mains voltage, the controller automatically
returns to the last operating mode selected.
Manual
The individual relay outputs, v outputs and the connected consumers can be checked for proper functioning and correct assignment.
The operating mode ‚Manual‘ may only be used by specialists for brief function tests, e.g. during commissioning! Function
in manual mode: The relays and thus the connected consumers are switched on and off by pressing a key, with no regard
to the current temperatures and set parameters. At the same time, the current measurement values of temperature sensors
are also shown in the display for the purposes of function control.
Off
If the operating mode “off” is enabled, all control functions are turned off. The measured temperatures are displayed for the
overview.
15

4. Settings
By no means does the controller replace the safety appliances on site!
Tmin S1
Enable/start temperature at sensor 1:
If this value on the sensor 1 (collector sensor) is exceeded and the other conditions are not fulfilled, the controller will turn on the affil-
iated pump or the valve. If the temperature on the sensor 1 falls 5 °C below this value, the pump or the valve will be turned off again.
Priority Storage X
Priority of storages in a multiple storage system. This determines the order, in which the storages are charged. If the same priority is set
for 2 storages, the charging is not switched over until charging the active storage is not possible anymore.
Example: if several storages or storage areas in your system are integrated, you can specify a priority for each sensor of the storage or
the storage area. The "X" in the menu item priority S(X) indicates the sensor of the respective storage or storage area.
The priority for the first storage is thus set under priority S2 and for the 2. storage under priority S3.
ΔT Solar S(X)
Switch-on/switch-off temperature difference for sensor X: If the temperature difference ΔT solar between the reference sensors is
exceeded and the other conditions are fulfilled, the controller will turn on the pump/valve on the corresponding relay. If the temperature
difference falls to ΔT Off, the pump/valve will be turned off again.
If the set temperature difference is too small, this may lead to ineffective operation depending on the system and sensor pos-
itioning. For speed regulation (See " Speed control " on page 19), special switch conditions apply!
Example: if several storages or storage areas in your system are integrated, you can specify ΔT for each sensor of the storage or the
storage area. The "X" in the menu item ΔT solar S(X) indicates the sensor of the respective storage or storage area. ΔT solar for the first
storage is thus set under ΔT solar S2 and for the 2. storage under ΔT solar S3.
Tmax S2
Switch off temperature at sensor 2:
If this value is exceeded on the sensor 2, the controller turn off the affiliated pump or the valve. If this value on the sensor 2 is undershot
and the other conditions are fulfilled, the controller will turn on the pump or the valve.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be
provided by the customer!
In multiple storage systems, if the shut-down temperature S2 is exceeded, a downstream installed storage or storage area is switched
to.
Tmin Storage X
Switch-off temperature at sensor X at multiple storage systems
If this value is exceeded at sensor X then the controller switches the associated pump and/or valve off. If sensor (X) falls below this value
again and the other conditions are also met, then the controller switches the pump and/or valve on again.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be
provided by the customer!
In multiple storage systems, if the shut-down temperature S(X) is exceeded, a downstream installed storage or storage area is switched
to.
Example: if several storages or storage areas in your system are integrated, you can specify a priority for each sensor of the storage or
the storage area. The "X" in the menu item priority S(X) indicates the sensor of the respective storage or storage area.
16

The priority for the first storage is thus set under priority S2 and for the 2. storage under priority S3.
Tmax Pool / Tmax Pool HE
Switch-off temperature at heat exchanger sensor. If this value is exceeded at the specified sensor, the controller turn off the affiliated
pump or the valve. If this value on the sensor is undershot and the other conditions are fulfilled, the controller will turn on the pump or
the valve.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be
provided by the customer!
Priority temperature
Temperature threshold for absolute priority charge. In systems with two storage tanks charging of the lower-priority storage tank will
never take place until this temperature at sensor of the higher-priority storage tank is exceeded.
Loading time
Interruption of charging into the lower priority storage. The charging of the lower-priority storage is interrupted after the settable time in
order to check whether the collector has reached a temperature level that allows charging in the higher- priority storage. If so, the pri-
ority storage tank is charged. If not, the increase is measured (See " Increase " on page 17), to check if charging of the priority storage
will be possible shortly.
Increase
Extension of the charging pause due to temperature increase. For precise setting of the charging priorities for systems with multiple
storage tanks, the necessary temperature increase of the collector at which the interruption of the charging into the lower-priority stor-
age tank is extended by one minute is set here. The interruption is extended because the temperature increase of the collector is
expected to enable charging in the higher-priority storage tank soon. As soon as ΔT conditions are met, the priority storage tank is
charged.
If the rise in temperature falls below the set value, then the charging of the lower-priority storage tank is enabled again.
5. Protective Functions
The 'Protective functions‘ can be used by specialists to activate and set various
protective functions.
By no means does the controller replace the safety appliances on site!
System protection
Priority protection function
The system protection should prevent an overheating of the components installed in the system through the forced shut down of the
solar circulation pump. If the value “AS Ton” on the collector has been exceeded for 1 Min. the pump will be turned off and not turn on
again in order to protect the collector, for example, from steam. The pump will only be switched on again, when the collector tem-
perature falls below “SP Toff”.
With the system protection (on), there are increased standstill temperatures in the solar collector and therefore an increased
pressure in the system. The operating manuals from the system components must be observed.
Collector protection
Priority protection function
The collector protection prevents the collector from overheating. A forced switching of the pump makes sure that the collector is cooled
through the storage. If the value “KS Ton” is exceeded on the collector, the pump will be turned on in order to cool the collector. The
pump is shut down if the value “KS Toff” on the collector is not met or the value “KS Tmax Sp.” on the storage is exceeded.
System protection has priority over collector protection! Even if the switch requirements for the collector protection are
present, the solar circulation pump is turned off once “AS T on” is reached. Normally the values from the system protection
(depending on the maximum temperature of the storage or other components) are higher than the collector protection.
17

Recooling
In the system hydraulics with solar, excess energy is guided from the storage back to the collector with an activated return cooling func-
tion. This only occurs if the temperature in the storage is greater than the value “Return cooling Tref” and the collector is at least 20 °C
colder than the storage and until the storage temperature has fallen below the value “Return cooling Tref”. For muti-storage systems, the
return cooling applies to all storage.
Energy is lost through the collector through this function! The recooling should only be activated in cases of exception, with
low heat acceptance, for example, during vacation.
Frost Protection
A 2-level frost protection function can be activated. In level 1, the controller turns on the pump every hour for 1 minute if the collector tem-
perature is below the set value “Frost Level 1”. If the collector temperature continues to decrease to the set value “Frost Level 2”, the con-
troller will turn on the pump without disruption. If the collector temperature exceeds the value “Frost level 2” by 2 °C, the pump will turn
off again.
Energy is lost through the collector through this function! It is normally not activated for solar systems with antifreeze. The oper-
ating manuals from the other system components must be observed.
Seizing Protection
If the anti-seizing protection is activated, the controller switches the heat pump and the mixer on/off at 12:00 noon or weekly on Sundays
at 12:00 for 5 seconds to prevent seizing of the pump/valve after long periods of inactivity.
Collector alarm
If this temperature at the collector sensor is exceeded when the solar pump is turned on, a warning or error notification is triggered.
There is a corresponding warning in the display.
6. Special Functions
Used to set basic items and expanded functions.
The settings in this menu should only be changed by a specialist.
Program selection
Here the hydraulic variation fitting to the respective use case is selected and set.
The program selection normally occurs only once during the first entry into service by a specialist. An incorrect program selec-
tion may lead to unpredictable errors.
Pump settings
Settings from the 0-10V or the PWM pump can be made in this menu.
When this menu is selected, you may receive a request to save the speed settings.
Profile
In this menu, the preset profiles for actuators can be selected or under “manual” all settings can be done personally. The settings can
still be changed after a profile has been selected.
18

Signal type
Only available, if the function is used on one of the V-outputs. The type of device to be controlled is set here.
0-10V: Control by 0-10V signal.
PWM: Control by means of a PWM signal.
Output Signal
In this menu the type of actors are set: heating pumps have the greatest output with a small input signal, solar pumps in contrast have
very little output with a small input signal. Solar = normal, heating = inverted. For 0-10 V pump always choose the "Normal" setting
PWM / 0-10V off
This voltage / this signal is emitted if the actor is turned off (actor with cable break detection require a minimum voltage / a minimum
signal).
PWM / 0-10V on
This voltage / signal is required the actuator to switch on and run at minimum speed.
PWM / 0-10V max.
With this value, the maximum voltage level / maximum signal can be specified for the highest speed of the actuator, which is used, for
example, during the flushing or manual operation.
Show signal
Represents the set signal in a graphic and text overview.
Speed control
If the speed control is activated, itMTDC offers the possibility through a special internal electronic system to change the speed of
pumps depending on the process.
This function should only be activated by a technician. Depending on the pump being used and the pump level, the min-
imum speed may not be set too small, because the pump or the system may be damaged. The specifications from the
affected manufacturer must be observed for this! When in doubt, the min. speed and the pump level should be set too high
instead of too low.
Variant
The following speed variants are available here:
Off: There is no speed regulation. The connected pump is only turned on or off with full speed.
Mode M1: The controller changes to the set max. speed after the purging time. If the temperature difference ∆T between the reference
sensors is below the set switch on temperature difference ∆T R1, the speed will be reduced. If the temperature difference between the
reference sensors is above the set switch on temperature difference ∆T R1, the speed will be increased. If the controller has
decreased the speed of the pump to the smallest level and the ∆T between the reference sensors is still only ∆Toff, the pump will be
turned off.
Mode M2: The controller changes to the set min. speed after the Speed. If the temperature difference ∆T between the reference
sensors is above the set switch on temperature difference ∆T R1, the speed will be increased. If the temperature difference ∆T
between the reference sensors is below the set switch on temperature difference ∆T R1, the speed will be reduced. If the controller
has decreased the speed of the pump to the smallest level and the ∆T between the reference sensors is still only ∆Toff, the pump will
be turned off.
Mode M3: The controller changes to the set min. speed after the Speed. If the temperature on the reference sensors is above the set
value to be set in the following, the speed will be increased. If the temperature on the reference sensors is below the set value to be
set in the following, the speed will be reduced.
Mode M4 (2 storage system):
When the primary storage is loaded, speed control works as in M3. When the secondary storage is loaded, speed control works as in
M1.
Purging time
For this time, the pump runs with its full speed (100%) in order to guarantee a secure start-up. Only after expiration of this purging time
will the pump have a controlled speed and will switch, depending on the set variant, to the max. or min. speed. Speed.
Sweep time
With the control time, the inertia of the speed control is determined in order to prevent strong temperature deviations as much as pos-
sible. The timespan is entered here, which is needed for a complete cycle from minimum speed to maximum speed.
Max. Speed
The maximum speed of the pump is determined here in %. During the setting, the pump runs in the respective speed and the flow can
be determined.
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The specified percentages are variables, which may deviate more or less strongly depending on the system, pump and pump
level. 100% is the maximum possible power of the controller.
Min. Speed
The minimum speed of the pump is determined here. During the setting, the pump runs in the respective speed and the flow can be
determined.
The specified percentages are variables, which may deviate more or less strongly depending on the system, pump and pump
level. 100% is the maximum possible power of the controller.
Setpoint
This value is the control setpoint. If this value is below at the sensor, the speed is reduced. When it is exceeded, the speed is increased.
Setpoint ΔT
This value is the selectable temperature difference for mode 1 and 2 (see “6.3.1 - Speed Mode”). Below this value ΔT between the ref-
erence sensors, the speed is reduced. When it is exceeded, the speed is increased.
Relay functions
Free, i.e. in the specific hydraulic variant unused relays, can be assigned to various additional functions. Every additional function can
only be assigned once.
R1 to R2: mechanical relay 230V
V1: PWM and 0-10 V output
Please pay special attention to the relay’s technical information (see "Specifications“).
The symbols shown here are displayed on the main overview screen when the special function is activated.
The sequence in this list does not correspond to the menu numbering in the controller.
Solar bypass
Use a relay to switch a bypass valve or a bypass pump. With this function, the flow can be guided past the storage if the flow tem-
perature at the bypass sensor is less than in the storage to be filled.
Solar bypass
Variant
In this menu, you can set if the flow is guided through the bypass with a pump or a valve.
Bypass sensor
The reference sensor for the bypass function to be placed in the flow is selected in this menu.
Thermostat
Through the thermostat function, additional energy can be added to the system while being time and temperature controlled. The ther-
mostat function can be used in 2 modes.
"On" = the relay is switched on when all switching conditions are reached
"Inverted" = the relay is switched off when all switching conditions are reached and is otherwise switched on.
Temperature values which are set too high can lead to scalding or damage to the system. Scalding protection must be
provided by the customer!
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